Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
  • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
  • H04B7/0682—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using phase diversity (e.g. phase sweeping)
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
  • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
  • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
  • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
  • H04B7/06966—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping using beam correspondence; using channel reciprocity, e.g. downlink beam training based on uplink sounding reference signal [SRS]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/0005—Control or signalling for completing the hand-off
  • H04W36/0055—Transmission or use of information for re-establishing the radio link
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W56/00—Synchronisation arrangements
  • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0833—Random access procedures, e.g. with 4-step access
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/0005—Control or signalling for completing the hand-off
  • H04W36/0055—Transmission or use of information for re-establishing the radio link
  • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
  • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
  • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0833—Random access procedures, e.g. with 4-step access
  • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

Definitions

• Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
• Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power).
• multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
• CDMA code division multiple access
• TDMA time division multiple access
• FDMA frequency division multiple access
• OFDMA orthogonal frequency division multiple access
• SC-FDMA single-carrier frequency division multiple access
• TD-SCDMA time division synchronous code 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 equipment (UEs).
• UEs user equipment
• LTE Long Term Evolution
• LTE-A LTE Advanced
• eNB eNodeB
• NR new radio
• 3GPP Third Generation Partnership Project
• the apparatus generally includes at least one processor and a memory coupled to the at least one processor.
• the at least one processor is configured to receive an assignment of at least one UE-specific configuration, wherein the UE-specific configuration comprises an allocation of resources for a synchronization signal (SS) for mobility, and communicate with a BS based, at least in part, on the UE-specific configuration.
• SS synchronization signal
• Certain aspects of the present disclosure provide a computer readable medium storing computer executable instructions for causing a UE to receive an assignment of at least one UE-specific configuration, wherein the UE-specific configuration comprises an allocation of resources for a synchronization signal (SS) for mobility, and communicate with a BS based, at least in part, on the UE-specific configuration.
• SS synchronization signal
• FIG. 12 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
• identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation.
• FIG. 1 illustrates an example wireless network 100 in which aspects of the present disclosure may be performed.
• the wireless network may be a new radio (NR) or 5 G network.
• Mobility may refer to hand over from a serving BS to target BS.
• mobility may refer to a connected mode hand over where a UE maintains at least one active IP session during the hand over.
• the BS may also transmit an allocation of UE-specific contention-free RACH resources.
• the UE-specific SS and UE-specific RACH resources may be aperiodic.
• a UE may receive an assignment of at least one UE- specific configuration, wherein the UE-specific configuration comprises an allocation of resources for an SS.
• a UE may communicate with a BS based, at least in part, on the UE-specific configuration.
• a BS 110a may be a serving BS for the UE 120.
• a non-serving or target BS 110b or 110c may communicate with a BS 110a.
• the non-serving or target BS may exchange scheduling information, BS or UE 120 capability information, or configuration information associated with an SS (which may be a UE-specific SS) or UE-specific RACH resources.
• the logical architecture of distributed RAN 200 may support fronthauling solutions across different deployment types.
• the logical architecture may be based on transmit network capabilities (e.g., bandwidth, latency, and/or jitter).
• FIG. 5 illustrates a diagram 500 showing examples for implementing a communications protocol stack, according to aspects of the present disclosure.
• the illustrated communications protocol stacks may be implemented by devices operating in a wireless communication system, such as a 5G system (e.g., a system that supports uplink-based mobility).
• Diagram 500 illustrates a communications protocol stack including a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer 520, a Medium Access Control (MAC) layer 525, and a Physical (PHY) layer 530.
• RRC Radio Resource Control
• PDCP Packet Data Convergence Protocol
• RLC Radio Link Control
• MAC Medium Access Control
• PHY Physical
• Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
• the link directions may be based on the slot format.
• Each slot may include DL/UL data as well as DL/UL control information.
• mobility is based on an SS transmitted from one or more BSs.
• the SS signals (or SS blocks) are periodic and cell- specific.
• RACH resources are tied to the SS.
• RACH resources similar to SS resources, may also be cell-specific and periodic.
• two SS blocks may be mapped to the first slot of 14 symbols.
• the first location 702 may be at symbols 4-7.
• the second location 704 may be at symbols 8-11.
• the BS 802 may transmit using various transmit beam directions, in an effort to cover all directions of the cell.
• a UE 804 located in the cell may thus receive a signal transmitted by the BS 804, regardless of the location of the UE within the cell.
• a connected mode UE receives SS blocks transmitted using a UE-specific configuration from its serving BS.
• the UE may detect the presence of the target BS and may report the link quality and associated transmit beams of target BS. This may occur based on the SS from the target BS or BRS.
• the target BS may convert or repurpose a subframe typically used for data transmission.
• a subframe typically used for data may be used for contention-free RACH.
• the UE-specific RACH may be aperiodic.
• the SS transmitted using a UE-specific configuration may be transmitted in a subframe typically reserved for data transmissions. The SS may not need to be transmitted in locations used for cell-specific SS transmissions.
• the SS is transmitted in a slot typically used for cell- specific SS transmission.
• the SS is transmitted in a slot typically used for data transmission.
• the configuration for the RACH procedure may include at least one preamble or set of preambles assigned to the UE for the RACH procedure.
• the UE may select one of the preambles for the RACH procedure.
• the configuration may include a number of RACH preambles to be transmitted by the UE during the contention-free RACH procedure.
• the configuration may include an indication of receive beams used by the BS to receive a RACH preamble during the contention-free RACH procedure.
• the configuration may include a numerology (tone spacing) associated with the contention-free RACH procedure.
• the SS is transmitted using UE-specific resources.
• the SS is a UE-specific SS.
• the methods disclosed herein comprise one or more steps or actions for achieving the described method.
• the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
• the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
• a phrase referring to "at least one of a list of items refers to any combination of those items, including single members.
• "at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).
• 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 (IR), 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 compact disc (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.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2018
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