US20160278130A1 - Mobile station and mobile communication system - Google Patents

Mobile station and mobile communication system Download PDF

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Publication number
US20160278130A1
US20160278130A1 US15/032,689 US201415032689A US2016278130A1 US 20160278130 A1 US20160278130 A1 US 20160278130A1 US 201415032689 A US201415032689 A US 201415032689A US 2016278130 A1 US2016278130 A1 US 2016278130A1
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United States
Prior art keywords
random access
radio base
base station
transmission power
mobile station
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Abandoned
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US15/032,689
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English (en)
Inventor
Tooru Uchino
Kazuki Takeda
Hideaki Takahashi
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKAHASHI, HIDEAKI, TAKEDA, KAZUKI, UCHINO, Tooru
Publication of US20160278130A1 publication Critical patent/US20160278130A1/en
Abandoned legal-status Critical Current

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    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Definitions

  • the present invention relates to a mobile station and a mobile communication system.
  • CA Carrier Aggregation
  • the CA used till Release-10 of the LTE system has been expanded, and, as shown in FIG. 4( b ) , performing “Inter-eNB CA (or Inter-node UP aggregation)” is being studied (see Non-Patent Document 1).
  • the “Inter-eNB CA” is a simultaneous communication using CC# 1 and CC# 2 that are under the control of different radio base stations eNB# 1 and eNB# 2 , and can achieve high throughput.
  • the “Inter-eNB CA” is required to be performed.
  • Non-Patent Document 1 3GPP Contribution R2-131782
  • each radio base station eNB is assumed to independently start RACH (Random Access Channel) procedure.
  • the present invention has been made in view of the above circumstances. It is an object of the present invention to provide a mobile station and a mobile communication system that are capable of performing an appropriate transmission power control when plural RACH procedures are simultaneously started.
  • a mobile station capable of performing a carrier aggregation by using a master radio base station and a secondary radio base station includes a controlling unit that, in the carrier aggregation, when plural random access procedures are started, performs a prioritized control based on a predetermined rule on a transmission power control in each of the plural random access procedures.
  • a mobile station capable of performing a carrier aggregation by using a master radio base station and a secondary radio base station includes a controlling unit that selects, in the carrier aggregation, when plural random, access procedures are started, and when simultaneous transmission of random access preambles occurs in the plural random access procedures and when at least one of the random access procedures in which the simultaneous transmission occurs is a contention based random access procedure, a combination of random access preambles for which a value of MPR or P-MPR is smallest.
  • a mobile communication system in which a mobile station is capable of performing a carrier aggregation by using a master radio base station and a secondary radio base station, the master radio base station or the secondary radio base station sets to the mobile station a random access preamble sequence for simultaneous transmission and a random access preamble sequence for non-simultaneous transmission, and the mobile station uses, in the carrier aggregation, when plural random access procedures are started, and when simultaneous transmission of random access preambles occurs in the plural random access procedures, the random access preamble sequence for simultaneous transmission.
  • a mobile communication system in which a mobile station is capable of performing a carrier aggregation by using a master radio base station and a secondary radio base station, the master radio base station or the secondary radio base station adjusts, in the carrier aggregation, so that simultaneous transmission of random access preambles in plural random access procedures does not occur, a resource in a time direction for transmitting a random access preamble assigned to the mobile station.
  • FIG. 1 is an overall structural diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of a mobile station according to the first embodiment of the present invention.
  • FIG. 3 is a flow chart for explaining an operation of the mobile station according to the first embodiment of the present invention.
  • FIG. 4 is a view for explaining carrier aggregation.
  • FIGS. 1 to 3 a mobile communication system according to a first embodiment of the present invention is explained below.
  • the mobile communication system is a mobile communication system of the LTE system (or, LTE-Advanced system). As shown in FIG. 1 , the mobile communication system includes a radio base station MINE (a master radio base station), and a radio base station SeNB (a secondary radio base station).
  • MINE a master radio base station
  • SeNB a secondary radio base station
  • a mobile station UE is capable of performing the “Inter-eNB CA” by using the radio base station MeNB and the radio base station SeNB.
  • the mobile station UE includes a receiving unit 11 , a transmitting unit 12 , and a controlling unit 13 .
  • the receiving unit 11 is configured to receive various signals from the radio base stations MeNB and SeNB.
  • the transmitting unit 12 is configured to transmit various signals to the radio base stations MeNB and SeNB.
  • the controlling unit 13 is configured to perform, during the “Inter-eNB CA”, when plural RACH procedures are started, a prioritized control based on a predetermined rule on a transmission power control in each of the plural RACH procedures.
  • the controlling unit 13 can perform, as the prioritized control, on a transmission power control, a prioritized control based on priority explicitly instructed by the radio base station MeNB or the radio base station SeNB.
  • the instructions by the radio base station MeNB or the radio base station SeNB can be transmitted via any layer such as RRC layer, MAC layer, or a physical layer.
  • controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure between the radio base station MeNB.
  • the controlling unit 13 can give, when plural radio base stations SeNB exist, priority in the prioritized control to a transmission power control in RACH procedure between a radio base station SeNB among plural radio base stations SeNB having a lower “eNBIndex”.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure between the radio base station MeNB or the radio base station SeNB in which SRS (Signaling Radio Bearer) has been set.
  • SRS Signalling Radio Bearer
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure in Pcell (Primary cell).
  • the controlling unit 13 can give, when plural Scells (Secondary cell) exist, priority in the prioritized control to a transmission power control in RACH procedure in “Special cell” among the plural Scells.
  • the “Special cell” can be a cell that is always in an active state, can be a cell that supports “Contention based RACH procedure”, can be a cell that has been set in the radio base station SeNB for the first time, or can be a cell in which RLM (Radio Link Monitoring) has been set.
  • RLM Radio Link Monitoring
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in “Non-contention based RACH procedure” (non-contention based random access procedure).
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure with a high transmission frequency of random access preamble (in other words, RACH procedure with a high power ramping frequency).
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure for PRACH (Physical Random Access Channel) specified from a network.
  • PRACH Physical Random Access Channel
  • the controlling unit 13 can lower, in the prioritized control, the priority of RACH procedure that is autonomously started by the mobile station UE based on “UL data resuming procedure”.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure for CCCH (Common Control Channel).
  • CCCH Common Control Channel
  • the CCCH is used to perform a reconnection procedure.
  • the controlling unit 13 can perform, when simultaneous transmission of random access preambles occurs in the plural RACH procedures, a ramping control (Power ramping) in the prioritized control on a transmission power of a random access preamble in the RACH procedure that is given priority, but cannot perform the ramping control (Power ramping) on a transmission power of a random access preamble in the RACH procedure other than the RACH procedure that is given priority.
  • a ramping control Power ramping
  • the controlling unit 13 can increase, in such a situation, the transmission frequency of random access preamble higher than the transmission frequency of random access preamble in a common RACH procedure.
  • the controlling unit 13 cannot transmit, when simultaneous transmission of random access preambles occurs in the plural RACH procedures, a random access preamble in RACH procedure other than the RACH procedure that is given priority.
  • FIG. 3 an example of the detailed operation of the mobile station UE according to the present embodiment is explained below.
  • the mobile station UE detects, at Step S 101 , a trigger for starting RACH procedure, and then determines, at Step S 102 , whether or not other RACH procedure has been started.
  • Step S 103 If the determination result is “Yes”, the operation advances to Step S 103 , and if the determination result is “No”, the operation advances to Step S 104 .
  • the mobile station UE performs a prioritized control based on a predetermined rule on a transmission power control in each of the plural RACH procedures.
  • Step S 104 the mobile station UE performs a transmission power control in the existing RACH procedure (refer to chapter 6.1 of 3GPP TS36.213).
  • a mobile communication system according to a first modification of the present invention is explained below while focusing on the points of difference with the mobile communication systems according to the first embodiment.
  • the controlling unit 13 of the mobile station UE can select, in the “Inter-eNB CA”, when plural RACH procedures are started, and when simultaneous transmission of the random access preamble occurs in “Contention based RACH procedure” among the plural RACH procedures, a combination of random access preambles for which a value of P-MPR (Power-management-Maximum Power Reduction) (or, a value of MPR) stipulated in Chapter 6.2.5 of 3GPP TS36.101 is the smallest.
  • P-MPR Power-management-Maximum Power Reduction
  • the controlling unit 13 selects, in the “Inter-eNB CA”, when plural random access procedures are started, and when simultaneous transmission of random access preambles occurs in the plural random access procedures and when at least one of the random access procedures in which the simultaneous transmission occurs is a contention based random access procedure, a combination of random access preambles for which the value of MPR or P-MPR is the smallest.
  • the controlling unit 13 can autonomously select, in the “Contention based RACH procedure”, a combination of CC for the PRACH or a random access preamble sequence (PRACH sequence) for which the value of P-MPR is the smallest.
  • a mobile communication system according to a second modification of the present invention is explained below while focusing on the points of difference with the mobile communication system according to the first embodiment.
  • the radio base station MeNB or the radio base station SeNB sets beforehand to the mobile station UE a random access preamble sequence (PRACH sequence) for simultaneous transmission and a random access preamble sequence (PRACH sequence) for non-simultaneous transmission.
  • PRACH sequence random access preamble sequence
  • PRACH sequence random access preamble sequence
  • the radio base station MeNB or the radio base station SeNB can use, in the random access preamble sequence for simultaneous transmission, “Preamble group B” that is transmitted with a lower transmission power and can use, in the random access preamble sequence for non-simultaneous transmission, “Preamble group A”.
  • the controlling unit 13 in the mobile station UE uses, in the “Inter-eNB CA”, when plural RACH procedures are started, and when simultaneous transmission of random access preambles occurs in the plural RACH procedures, the random access preamble sequence for simultaneous transmission.
  • a mobile communication system according to a third modification of the present invention is explained below while focusing on the points of difference with the mobile communication system according to the first embodiment.
  • the radio base station MeNB or the radio base station SeNB can adjust, in the “Inter-eNB CA”, a resource in a time direction for transmitting random access preambles assigned to the mobile station UE so that simultaneous transmission of random access preambles in the plural random access procedures does not occur.
  • a mobile station UE is capable of performing the “Inter-eNB CA (carrier aggregation)” by using a radio base station MeNB (master radio base station) and a radio base station SeNB (secondary radio base station), and includes a controlling unit 13 that, in the “Inter-eNB CA”, when plural RACH procedures (random access procedure) are started, performs a prioritized control based on a predetermined rule on a transmission power control in each of the plural RACH procedures.
  • a radio base station MeNB master radio base station
  • SeNB secondary radio base station
  • an appropriate transmission power control can be performed when plural RACH procedures are simultaneously started.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure between the radio base station MeNB.
  • the transmission power control in the RACH procedure between radio base station MeNB that plays an important role in the “Inter-eNB” can be given priority.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure between the radio base station eNB (MeNB or SeNB) in which SRB (signaling radio bearer) has been set.
  • eNB radio base station eNB
  • SRB signal radio bearer
  • the transmission power control in the RACH procedure between the radio base station in which the SRB that is important for performing communication has been set can be given priority.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure in Pcell (Primary cell).
  • the transmission power control in the RACH procedure in the Pcell that plays an important role in the “Inter-eNB”, can be given priority.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in the “Non-contention based RACH procedure (Non-contention based Random Access procedure)”.
  • the transmission power control in the “Non-contention based RACH procedure” that is started by a network's initiative can be given priority.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure with a high transmission frequency of random access preamble.
  • a transmission power control in RACH procedure that has been re-transmitting the random access preamble can be given priority.
  • the controlling unit 13 can give priority in the prioritized control to a transmission power control in RACH procedure for CCCH.
  • a transmission power control in RACH procedure pertaining to a reconnection procedure can be given priority.
  • the controlling unit 13 when simultaneous transmission of random access preambles occurs in the plural RACH procedures, can perform a ramping control on a transmission power of a random access preamble in RACH procedure that is given priority and cannot perform the ramping control on a transmission power of a random access preamble in the RACH procedure other than the random access procedure that is given priority.
  • the controlling unit 13 when simultaneous transmission of random access preambles occurs in plural RACH procedures, cannot transmit a random access preamble in RACH procedure other than the RACH procedure that is given priority.
  • a mobile station UE capable of performing the “Inter-eNB CA” by using a radio base station MeNB and a radio base station SeNB includes a controlling unit 13 that selects, in the “Inter-eNB CA”, when plural RACH procedures are started, and when simultaneous transmission of random access preambles occurs in the plural RACH procedures and when at least one of the RACH procedures in which the simultaneous transmission occurs is the “Contention based RACH procedure (contention based random access procedure)”, a combination of random access preambles for which a value of MPR or P-MPR is smallest.
  • an power offset value becomes smaller, a probability of occurrence of a power being kept at the maximum value (in other words, continuation of a state in which a required transmission power in the mobile station UE reaches at the maximum transmission power Pmax) when plural RACH procedures are started, can be reduced.
  • a mobile communication system includes a mobile station UE that is capable of performing the “Inter-eNB CA” by using a radio base station MeNB and a radio base station SeNB.
  • the radio base station MeNB or the radio base station SeNB sets, to the mobile station UE, a random access preamble sequence for simultaneous transmission and a random access preamble sequence for non-simultaneous transmission.
  • the mobile station UE uses, in the “Inter-eNB CA”, when plural RACH procedures are started, and when simultaneous transmission of random access preambles occurs in the plural RACH procedures, the random access preamble sequence for simultaneous transmission.
  • a mobile communication system includes a mobile station US that is capable of performing the “Inter-eNB CA” by using a radio base station MeNB and a radio base station SeNB.
  • the radio base station MeNB or the radio base station SeNB adjusts, in the “Inter-eNB CA”, a resource in a time direction for transmitting a random access preamble assigned to the mobile station UE so that simultaneous transmission of random access preambles in plural RACH procedures does not occur.
  • the mobile communication system can be configured to prevent simultaneous transmission of random access preambles.
  • the operations of the mobile station UE, and the radio base stations MeNB and SeNB can be realized by hardware, can be realized by a software module executed by a processor, or can be realized by the combination of these.
  • the software module can be stored in a storage medium having a desired form such as a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM), a register, a hard disk, a removable disk, a CD-ROM, and the like.
  • a RAM Random Access Memory
  • flash memory a ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable ROM
  • register a hard disk, a removable disk, a CD-ROM, and the like.
  • the storage medium is connected to a processor so that the processor can read/write information from/in the storage medium.
  • the storage medium can be integrated in a processor.
  • the storage medium and the processor can be arranged in ASIC.
  • the ASIC can be arranged in the mobile station UE, and the radio base station MeNB, SeNB.
  • the storage medium and the processor can be arranged as a discrete component in the mobile station UE, and the radio base station MeNB, SeNB.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
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US11153826B2 (en) * 2017-08-10 2021-10-19 Qualcomm Incorporated Procedure-based uplink power control
EP3821667B1 (de) * 2018-07-12 2022-06-01 Telefonaktiebolaget LM Ericsson (publ) Mechanismus zum zusammenführen von kollidierenden rach-vorgängen
US12089262B2 (en) * 2020-12-16 2024-09-10 Samsung Electronics Co., Ltd. Method and apparatus for multiple concurrent random access procedures

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ES2665345T3 (es) 2018-04-25
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