US20190239167A1 - Power Control Enhancement for Random Access - Google Patents

Power Control Enhancement for Random Access Download PDF

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Publication number
US20190239167A1
US20190239167A1 US16/289,116 US201916289116A US2019239167A1 US 20190239167 A1 US20190239167 A1 US 20190239167A1 US 201916289116 A US201916289116 A US 201916289116A US 2019239167 A1 US2019239167 A1 US 2019239167A1
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Prior art keywords
service
random access
preamble
power
transmit power
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English (en)
Inventor
Jinhua Liu
Jan Christoffersson
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHRISTOFFERSSON, JAN, LIU, JINHUA
Publication of US20190239167A1 publication Critical patent/US20190239167A1/en
Priority to US16/916,717 priority Critical patent/US11044680B2/en
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    • 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
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot 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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
    • 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
    • H04W52/38—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
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • 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

Definitions

  • the present disclosure generally relates to communications, and more specifically, relates to wireless communications.
  • Radio devices are expected to be able to establish sessions for different types of services by initiating random access (RA).
  • RA random access
  • URLLC ultra-reliable lower latency communication
  • eMBB enhanced mobile broadband
  • MTC massive machine type communication
  • a wireless communication network such as NR may be able to support various types of services via a common network.
  • Some services such as URLLC may have tight requirements with respect to reliability and delay. If the same parameter settings are applied for all services, the radio connection setup of a service with more strict requirements for the reliable RA may experience the same large delay as other services. Therefore, it may be desirable to reduce the delay for the service requiring more reliable RA.
  • the present disclosure proposes a solution of power control enhancement for RA, which may enable a transmit power boost to be applied for RA message transmissions by a terminal device for a service with higher reliability requirements, so that the terminal device can access to a network node for this service with high success rate and short delay.
  • a method implemented at a radio device may comprise a terminal device.
  • the method may comprise determining whether a RA procedure is initiated for a first service which requires a more reliable RA than a second service.
  • respective transmit power for one or more messages of the RA procedure may be estimated based at least in part on parameter settings for the first service.
  • the method may further comprise transmitting the one or more messages to a network node during the RA procedure by using the respective transmit power.
  • the estimation of the respective transmit power for the one or more messages of the RA procedure based at least in part on the parameter settings for the first service may comprise: determining at least one power boost parameter for the one or more messages according to the parameter settings for the first service; and calculating the respective transmit power for the one or more messages based at least in part on the at least one power boost parameter.
  • an apparatus may comprise one or more processors and one or more memories comprising computer program codes.
  • the one or more memories and the computer program codes may be configured to, with execution of the one or more processors, cause the apparatus at least to perform any step of the method according to the first aspect of the present disclosure.
  • a computer-readable medium having computer program codes embodied thereon which, when executed on a computer, cause the computer to perform any step of the method according to the first aspect of the present disclosure.
  • an apparatus may comprise a determining module, an estimating module and a transmitting module.
  • the determining module may be operable to carry out at least the determining step of the method according to the first aspect of the present disclosure.
  • the estimating module may be operable to carry out at least the estimating step of the method according to the first aspect of the present disclosure.
  • the transmitting module may be operable to carry out at least the transmitting step of the method according to the first aspect of the present disclosure.
  • a method implemented at a radio device may comprise a network node.
  • the method may comprise configuring parameter settings for a first service and a second service.
  • the first service may require a more reliable RA than the second service.
  • the method may further comprise transmitting the parameter settings to a terminal device.
  • the parameter settings may enable the terminal device to perform different transmit power estimations for a message of a RA procedure according to whether the RA procedure is initiated for the first service or the second service.
  • the method according to the fifth aspect of the present disclosure may further comprise receiving one or more messages from the terminal device during the RA procedure initiated for the first service.
  • an apparatus may comprise one or more processors and one or more memories comprising computer program codes.
  • the one or more memories and the computer program codes may be configured to, with execution by the one or more processors, cause the apparatus at least to perform any step of the method according to the fifth aspect of the present disclosure.
  • a computer-readable medium having computer program codes embodied thereon which, when executed on a computer, cause the computer to perform any step of the method according to the fifth aspect of the present disclosure.
  • an apparatus may comprise a configuring module and a transmitting module.
  • the configuring module may be operable to carry out at least the configuring step of the method according to the fifth aspect of the present disclosure.
  • the transmitting module may be operable to carry out at least the transmitting step of the method according to the fifth aspect of the present disclosure.
  • the apparatus according to the eighth aspect of the present disclosure may further comprise a receiving module.
  • the receiving module may be operable to carry out at least the receiving step of the method according to the fifth aspect of the present disclosure.
  • the parameter settings may cause the respective transmit power for the one or more messages for the first service to be boosted compared to the second service.
  • the one or more messages may comprise at least one of a preamble of physical random access channel (PRACH) and message 3.
  • PRACH physical random access channel
  • the parameter settings may indicate at least one of the following power parameters: a higher initial received target power of a preamble of PRACH for the first service than for the second service; a larger power ramping factor for the preamble of PRACH for the first service than for the second service; and a larger maximum number of preamble transmission of PRACH for the first service than for the second service.
  • the parameter settings may indicate at least one of the following power parameters: a first increment of an initial received target power of a preamble of PRACH for the first service relative to the second service; a second increment of a power ramping factor for the preamble of PRACH for the first service relative to the second service; and a third increment of a maximum number of preamble transmission of PRACH for the first service relative to the second service.
  • the parameter settings may indicate a fourth increment of transmit power for message 3 for the first service relative to the second service.
  • the parameter settings may indicate to use one or more power parameters for a preamble of PRACH for the first service to calculate a fifth increment of transmit power for message 3 for the first service relative to the second service.
  • the parameter settings may be obtained from the network node or predefined at the radio device such as a terminal device.
  • FIG. 1 is a flowchart illustrating a method according to some embodiments of the present disclosure
  • FIG. 2 is a flowchart illustrating another method according to some embodiments of the present disclosure
  • FIG. 3 is a flowchart illustrating a method for implementing power control enhancement for RA according to an embodiment of the present disclosure
  • FIG. 4 is a block diagram illustrating an apparatus according to various embodiments of the present disclosure.
  • FIG. 5 is a block diagram illustrating another apparatus according to some embodiments of the present disclosure.
  • FIG. 6 is a block diagram illustrating yet another apparatus according to some embodiments of the present disclosure.
  • wireless communication network refers to a network following any suitable communication standards, such as long term evolution-advanced (LTE-A), LTE, wideband code division multiple access (WCDMA), high-speed packet access (HSPA), and so on.
  • LTE-A long term evolution-advanced
  • WCDMA wideband code division multiple access
  • HSPA high-speed packet access
  • the communications between a terminal device and a network node in the wireless communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G), the second generation (2G), 2.5G, 2.75G, the third generation (3G), the fourth generation (4G), 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, but not limited to, the first generation (1G), the second generation (2G), 2.5G, 2.75G, the third generation (3G), the fourth generation (4G), 4.5G, the future fifth generation (5G) communication protocols, and/
  • network node refers to a network device in a wireless communication network via which a terminal device accesses to the network and receives services therefrom.
  • the network device refers to a base station (BS), an access point (AP), multi-cell/multicast coordination entity (MCE), a gateway, a server, a controller or any other suitable device in the wireless communication network.
  • BS base station
  • AP access point
  • MCE multi-cell/multicast coordination entity
  • gateway a gateway
  • server a controller or any other suitable device in the wireless communication network.
  • the BS may be, for example, a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a next generation NodeB (gNodeB or gNB), a remote radio unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, a low power node such as a femto, a pico, and so forth.
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • gNodeB or gNB next generation NodeB
  • RRU remote radio unit
  • RH radio header
  • RRH remote radio head
  • relay a low power node such as a femto, a pico, and so forth.
  • the network node comprise multi-standard radio (MSR) radio equipment such as MSR BSs, network controllers such as radio network controllers (RNCs) or base station controllers (BSCs), base transceiver stations (BTSs), transmission points, transmission nodes, positioning nodes and/or the like. More generally, however, the network node may represent any suitable device (or group of devices) capable, configured, arranged, and/or operable to enable and/or provide a terminal device access to the wireless communication network or to provide some service to a terminal device that has accessed to the wireless communication network.
  • MSR multi-standard radio
  • RNCs radio network controllers
  • BSCs base station controllers
  • BTSs base transceiver stations
  • transmission points transmission nodes
  • positioning nodes positioning nodes and/or the like.
  • the network node may represent any suitable device (or group of devices) capable, configured, arranged, and/or operable to enable and/or provide a terminal device access to the wireless communication network or to provide some service to a terminal
  • terminal device refers to any end device that can access a wireless communication network and receive services therefrom.
  • the terminal device refers to a mobile terminal, user equipment (UE), or other suitable devices.
  • the UE may be, for example, a subscriber station, a portable subscriber station, a mobile station (MS) or an access terminal (AT).
  • the terminal device may include, but not limited to, portable computers, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, a mobile phone, a cellular phone, a smart phone, a tablet, a wearable device, a personal digital assistant (PDA), a vehicle, and the like.
  • PDA personal digital assistant
  • the terminal device may support device-to-device (D2D) communication, for example by implementing a 3GPP standard for sidelink communication, and may in this case be referred to as a D2D communication device.
  • D2D device-to-device
  • a terminal device may represent a machine or other device that performs monitoring, sensing and/or measurements etc., and transmits the results of such monitoring, sensing and/or measurements etc. to another terminal device and/or a network equipment.
  • the terminal device may in this case be a machine-to-machine (M2M) device, which may in a 3GPP context be referred to as a machine-type communication (MTC) device.
  • M2M machine-to-machine
  • MTC machine-type communication
  • the terminal device may be a UE implementing the 3GPP narrow band internet of things (NB-IoT) standard.
  • NB-IoT 3GPP narrow band internet of things
  • machines or devices are sensors, metering devices such as power meters, industrial machinery, or home or personal appliances, e.g. refrigerators, televisions, personal wearables such as watches etc.
  • a terminal device may represent a vehicle or other equipment, for example, a medical instrument that is capable of monitoring, sensing and/or reporting etc. on its operational status or other functions associated with its operation.
  • a radio device may be a network node or a terminal device. That is, a method proposed according to the disclosure can be implemented at a network node or a terminal device, to which the power control enhancement for RA may be applicable.
  • the terms “first”, “second” and so forth refer to different elements.
  • the singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the terms “comprises”, “comprising”, “has”, “having”, “includes” and/or “including” as used herein, specify the presence of stated features, elements, and/or components and the like, but do not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof.
  • the term “based on” is to be read as “based at least in part on”.
  • the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment”.
  • the term “another embodiment” is to be read as “at least one other embodiment”.
  • Other definitions, explicit and implicit, may be included below.
  • various types of services such as URLLC, eMBB and mMTC
  • URLLC URLLC
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • Different services have different reliability and latency requirements.
  • the URLLC service is more reliable and delay sensitive.
  • a RA procedure may be initiated to establish a session for a specific service.
  • RA may impact the user experience since one significant part of the latency introduced during communications is the latency of the RA.
  • Many differentiated RA configurations with respect to delay sensitivity of services may be applied in a communication system. For instance, reconfiguration of numerology/transmission time interval (TTI) duration during RA may be performed to speed up the RA procedure for some services.
  • TTI transmission time interval
  • a smaller backoff window size may be used to initiate the next RA procedure earlier when the previous RA procedure fails.
  • PRACH resource partition may be used to reduce the PRACH collision probability for the URLLC service.
  • the transmit power of a preamble of PRACH can be calculated by using a parameter PREAMBLE_RECEIVED_TARGET_POWER, which represents the target received power of the preamble and may be set as follows:
  • PREAMBLE_RECEIVED_TARGET_POWER preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER ⁇ 1)*powerRampingStep (1)
  • preambleInitialReceivedTargetPower represents the initial preamble power
  • DELTA_PREAMBLE represents a preamble format based offset
  • PREAMBLE_TRANSMISSION_COUNTER represents a counter for preamble transmission
  • powerRampingStep represents a power ramping factor. It is noted that higher PREAMBLE_RECEIVED_TARGET_POWER means the relative higher transmit power of the preamble.
  • the RA procedure may be performed by instructing the physical layer to transmit a preamble using the selected PRACH, the corresponding random access-radio network temporary identifier (RA-RNTI), preamble index and PREAMBLE_RECEIVED_TARGET_POWER.
  • RA-RNTI random access-radio network temporary identifier
  • the RA response reception is considered not successful and the media access control (MAC) entity may take some appropriate actions.
  • MAC media access control
  • PREAMBLE_TRANSMISSION_COUNTER may be increased by 1.
  • PREAMBLE_TRANSMISSION_COUNTER preambleTransMax+1
  • the RA preamble is transmitted on the secondary primary cell (SpCell) in dual connectivity case
  • a RA problem may be indicated to upper layers, where preambleTransMax represents the maximum number of preamble transmission. If the RA preamble is transmitted on the secondary cell (SCell), then the RA procedure is considered unsuccessfully completed.
  • a random backoff time may be selected according to a uniform distribution between 0 and the backoff parameter value.
  • the subsequent RA transmission may be delayed by the backoff time.
  • RRC information element may be used to configure the generic RA parameters.
  • the information element RACH-ConfigCommon may be used to specify the generic RA parameters, such as preambleInitialReceivedTargetPower, PREAMBLE_TRANSMISSION_COUNTER, powerRampingStep and preambleTransMax. These parameters may impact the PRACH transmit power settings.
  • the radio connection setup of the URLLC service may experience the same large delay as the eMBB/mMTC services.
  • a special transmit power boost may be applied for RA message transmissions by a terminal device for some specified services, so that the RA delay for the specified services can be reduced.
  • FIG. 1 is a flowchart illustrating a method according to some embodiments of the present disclosure.
  • the method illustrated in FIG. 1 may be performed by an apparatus implemented at a terminal device or communicatively coupled to a terminal device.
  • the terminal device may comprise a UE, a mobile station, a wireless device, a PDA, a laptop computer, a tablet computer, a smart phone, a portable device, or any other user device being capable of participating in communication of a wireless network.
  • a radio device such as a terminal device may determine whether a RA procedure is initiated for a first service at block 102 .
  • the first service such as URLLC service may require a more reliable RA than a second service such as eMBB service or mMTC service.
  • eMBB service or mMTC service.
  • the terminal device may estimate respective transmit power for one or more messages of the RA procedure at block 104 , based at least in part on parameter settings for the first service.
  • the parameter settings may indicate one or more parameters related to power control, certain power control strategies or rules for the RA procedure, and/or the like.
  • the terminal device may transmit the one or more messages to a network node during the RA procedure by using the respective transmit power as estimated at block 104 .
  • the one or more messages may comprise at least one of a preamble of PRACH and message 3.
  • the exemplary illustrations of the one or more messages are not limited to the preamble of PRACH, message 1 and message 3 in the context of NR and LTE, but may comprise other RA messages.
  • the proposed methods, apparatus and related products herein may also be applicable to other suitable network environments, for example, various wireless communication systems which can support RA message transmissions for different types of sessions or services, although some exemplary embodiments are described with respect to NR or LTE.
  • the parameter settings as described in connection with FIG. 1 may cause the respective transmit power for the one or more messages for the first service to be boosted compared to the second service.
  • Boosting the transmit power of a specific message means increasing the original transmit power of this message by a predefined amount.
  • the parameter settings may indicate or specify at least one power boost parameter for a type of service, thereby achieving an increase of transmit power of a RA message for this type of service.
  • the power boost parameter may comprise a target value of transmit power, or a relative boost value for transmit power.
  • the estimation of the respective transmit power for the one or more messages of the RA procedure based at least in part on the parameter settings for the first service may comprises: determining at least one power boost parameter for the one or more messages according to the parameter settings for the first service; and calculating the respective transmit power for the one or more messages based at least in part on the at least one power boost parameter.
  • the parameter settings may be obtained from the network node or predefined at the terminal device.
  • the network node may transmit the parameter settings to the terminal device through broadcasting signals and/or upon registration of the terminal device to the network node.
  • FIG. 2 is a flowchart illustrating another method according to some embodiments of the present disclosure.
  • the method illustrated in FIG. 2 may be performed by an apparatus implemented at a network node or communicatively coupled to a network node.
  • the network node may comprise a gNB, an eNB, a BS, an AP, a communication node, a control center, a relay station, a repeater, or any other network device being capable of participating in communication of a wireless network.
  • the network node may configure parameter settings for a first service and a second service, as shown in block 202 .
  • the first service requires a more reliable RA than a second service.
  • the first service may comprise the URLLC service or any other service having tight requirements with respect to reliability and/or delay.
  • the network node may use some system information elements to configure the parameter settings.
  • a specified RRC information element such as RACH-ConfigCommon may be used to inform a terminal device of certain RA parameters indicated by the configured parameter settings.
  • the network node may transmit the parameter settings to a terminal device.
  • the parameter settings may be transmitted to the terminal device via broadcasting signals, registration signals and/or the like.
  • the parameter settings may enable the terminal device to perform different transmit power estimations for a message of a RA procedure according to whether the RA procedure is initiated for the first service or the second service.
  • the terminal device obtaining the parameter settings from the network node may perform power control enhancement for uplink RA in accordance with the exemplary method illustrated in FIG. 1 .
  • the network node may receive one or more messages from the terminal device during the RA procedure initiated for the first service.
  • the parameter settings may cause respective transmit power for the one or more messages for the first service to be boosted compared to the second service.
  • the parameter settings may enable to realize a transmit power boost of a preamble of PRACH for the terminal device with the first service.
  • a possible way to increase the transmit power of the preamble is to boost the value of PREAMBLE_RECEIVED_TARGET_POWER.
  • the parameter settings may indicate at least one of the following power parameters: a higher initial received target power of a preamble of PRACH for the first service than for the second service; a larger power ramping factor for the preamble of PRACH for the first service than for the second service; and a larger maximum number of preamble transmission of PRACH for the first service than for the second service.
  • new values of preambleInitialReceivedTargetPower and powerRampingStep may be specified for the first service such as URLLC service, so as to differentiate the RA power control of the first service from the second service such as eMBB or mMTC service.
  • some new parameters may be introduced in RACH-ConfigCommon to boost PRACH transmit power for a terminal device with URLLC service, such as preambleInitialReceivedTargetPowerUrllc, powerRampingStepUrllc, preambleTransMaxUrllc and/or the like.
  • the original parameters preambleInitialReceivedTargetPower, powerRampingStep and preambleTransMax are applied to a terminal device with eMBB or mMTC service.
  • the preambleInitialReceivedTargetPowerUrllc is larger than preambleInitialReceivedTargetPower
  • powerRampingStepUrllc is larger than powerRampingStep
  • preambleTransMaxUrllc is larger than preambleTransMax.
  • the higher PREAMBLE_RECEIVED_TARGET_POWER calculated for the URLLC service using one or more new parameters means relative higher transmit power of the preamble.
  • the parameter settings as described in combination with FIG. 1 and FIG. 2 may indicate at least one of the following power parameters: a first increment of an initial received target power of a preamble of PRACH for the first service relative to the second service; a second increment of a power ramping factor for the preamble of PRACH for the first service relative to the second service; and a third increment of a maximum number of preamble transmission of PRACH for the first service relative to the second service.
  • some new parameters may be specified for the first service such as URLLC service to indicate the relative power boost.
  • the first increment may be denoted as deltaPreambleInitialReceivedTargetPowerUrllc (>0 dB)
  • the second increment may be denoted as deltaPowerRampingStepUrllc (>0 dB)
  • the third increment may be denoted as deltapreambleTransMaxUrllc (>0 dB).
  • the new parameters may be specified in RACH-ConfigCommon from the network node to boost PRACH transmit power for a terminal device with URLLC service. Alternatively or additionally, these parameters may also be predefined at the terminal device to save the signaling overhead.
  • the terminal device can determine one or more boost parameters for the PRACH transmission using the following equations:
  • preambleInitialReceivedTargetPowerUrllc preambleInitialReceivedTargetPower+deltaPreambleInitialReceivedTargetPowerUrllc (2)
  • preambleTransMaxUrllc preambleTransMax+deltapreambleTransMaxUrllc (4)
  • a power boost for PRACH it is also meaningful to apply a power boost for message 3 transmission for URLLC service.
  • a power boost for message 3 transmission for URLLC service For example, at a PRACH collision between a first UE with URLLC service and a second UE with eMBB service, there may be a high probability that both UEs will send message 3 according to the same RA response from the gNB. If the first UE applies a power boost for message 3 transmission, there is still a high probability that the gNB successfully detects the message 3 from the first UE even though there is a message 3 collision between the first UE and the second UE.
  • a message 3 power boost may be enabled for the terminal device with the first service which requires a more reliable RA than the second device.
  • the parameter settings may indicate a fourth increment of transmit power for message 3 for the first service relative to the second service.
  • the parameter settings may indicate to use one or more power parameters for a preamble of PRACH for the first service to calculate a fifth increment of transmit power for message 3 for the first service relative to the second service.
  • a power boost may be achieved by predefining an offset (>0 dB) as the fourth increment for message 3 transmission for a UE with URLLC service.
  • the UE can firstly calculate the transmit power according to the normal power control schemes such as those applied in LTE. Then the UE can estimate the transmit power for message 3 by increasing the calculated transmit power with the predefined offset.
  • one or more power boost parameters may be preconfigured or predefined for PRACH, these parameters may be reused to calculate a transmit power boost for message 3.
  • the UE can calculate one of offset 1 to offset 4 using the following equations as the fifth increment to estimate the transmit power for message 3.
  • offset1 preambleInitialReceivedTargetPowerUrllc ⁇ preambleInitialReceivedTargetPower (5)
  • FIG. 3 is a flowchart illustrating a method for implementing power control enhancement for RA according to an embodiment of the present disclosure.
  • a UE may apply a transmission power boost to a preamble of PRACH (or simply “PRACH” for short) and/or message 3 based at least in part on the type of a session for which a RA is initiated.
  • PRACH Physical Broadcast Channel
  • message 3 based at least in part on the type of a session for which a RA is initiated.
  • Different services may correspond to different session types.
  • the session type may be determined by the priority of the logical channel that has data for transmission.
  • the high protocol layer of the UE can determine the session type (such as URLLC, eMBB or mMTC) for which the RA is initiated.
  • An indicator of the determined session type may be sent from the high protocol layer of the UE to the MAC layer.
  • the MAC layer can determine parameter settings and one or more power boost parameters for the transmit power estimation of PRACH and/or message 3 according to the indicator.
  • the parameter settings and the power boost parameters for the transmit power estimation can be determined or obtained from the transmit power boost configuration for PRACH and/or message 3.
  • Such transmit power boost configuration may be received by the UE from the network side, as shown in the optional block 302 of FIG. 3 .
  • the UE also can retrieve the predefined parameter settings and/or the predefined power boost parameters locally.
  • the MAC layer of the UE can estimate the transmit power for PRACH and/or message 3 using the determined parameters and parameter settings. Then the transmission of PRACH or message 3 can be scheduled during the RA procedure in the air interface. Accordingly, the UE can transmit PRACH and/or message 3 using the estimated transmit power, as shown in block 310 .
  • the proposed methods as illustrated with respect to FIGS. 1-3 can enhance the transmission power control for PRACH and/or message 3 by a terminal device for a more reliable service in RA, so as to increase the RA success rate and reduce the RA delay for this service.
  • a transmit power boost may be applied for uplink RA message transmissions by a UE with URLLC service, so that the UE with URLLC service can access to the system with short delay compared to a UE with eMBB/mMTC service.
  • a power boost may be applied to the PRACH for the UE with URLLC service, so that the gNB can detect the PRACH from the UE with a higher probability.
  • the transmit power for message 3 of the UE with URLLC service may also be boosted, so that there is a higher probability for the gNB to detect message 3 from the UE with URLLC service at a collision with another UE with eMBB/mMTC service.
  • a power boost for new message 1 transmission as an aggregated PRACH and message 3 transmission may be applied for URLLC service.
  • the above illustrated embodiments of a network node for parameter settings configuration and transmission, and a terminal device for service type determination, transmit power estimation and RA message transmission may be applicable to the two-step RA procedure in a similar way.
  • a RA response message as a contention resolution message from the network node acting as a receiver of the new message 1 can be sent to the terminal device acting as a RA initiator.
  • FIGS. 1-3 may be viewed as method steps, and/or as operations that result from operation of computer program code, and/or as a plurality of coupled logic circuit elements constructed to carry out the associated function(s).
  • the schematic flow chart diagrams described above are generally set forth as logical flow chart diagrams. As such, the depicted order and labeled steps are indicative of specific embodiments of the presented methods. Other steps and methods may be conceived that are equivalent in function, logic, or effect to one or more steps, or portions thereof, of the illustrated methods. Additionally, the order in which a particular method occurs may or may not strictly adhere to the order of the corresponding steps shown.
  • FIG. 4 is a block diagram illustrating an apparatus 400 according to various embodiments of the present disclosure.
  • the apparatus 400 may comprise one or more processors such as processor 401 and one or more memories such as memory 402 storing computer program codes 403 .
  • the memory 402 may be non-transitory machine/processor/computer readable storage medium.
  • the apparatus 400 may be implemented as an integrated circuit chip or module that can be plugged or installed into a terminal device as described with respect to FIG. 1 , or a network node as described with respect to FIG. 2 .
  • the one or more memories 402 and the computer program codes 403 may be configured to, with the one or more processors 401 , cause the apparatus 400 at least to perform any operation of the method as described in connection with FIG. 1 .
  • the one or more memories 402 and the computer program codes 403 may be configured to, with the one or more processors 401 , cause the apparatus 400 at least to perform any operation of the method as described in connection with FIG. 2 .
  • the one or more memories 402 and the computer program codes 403 may be configured to, with the one or more processors 401 , cause the apparatus 400 at least to perform more or less operations to implement the proposed methods according to the exemplary embodiments of the present disclosure.
  • FIG. 5 is a block diagram illustrating an apparatus 500 according to some embodiments of the present disclosure.
  • the apparatus 500 may comprise a determining module 501 , an estimating module 502 and a transmitting module 503 .
  • the apparatus 500 may be implemented at a terminal device.
  • the determining module 501 may be operable to carry out the operation in block 102
  • the estimating module 502 may be operable to carry out the operation in block 104
  • the transmitting module 503 may be operable to carry out the operation in block 106 .
  • the determining module 501 , the estimating module 502 and/or the transmitting module 503 may be operable to carry out more or less operations to implement the proposed methods according to the exemplary embodiments of the present disclosure.
  • FIG. 6 is a block diagram illustrating an apparatus 600 according to some embodiments of the present disclosure.
  • the apparatus 600 may comprise a configuring module 601 and a transmitting module 602 .
  • the apparatus 600 may be implemented at a network node.
  • the configuring module 601 may be operable to carry out the operation in block 202
  • the transmitting module 602 may be operable to carry out the operation in block 204 .
  • the apparatus 600 may further comprise a receiving module (not shown in FIG. 6 ) which may be operable to receive one or more messages from a terminal device.
  • the configuring module 601 , the transmitting module 602 and/or the receiving module may be operable to carry out more or less operations to implement the proposed methods according to the exemplary embodiments of the present disclosure.
  • the various exemplary embodiments may be implemented in hardware or special purpose chips, circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the disclosure is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the disclosure is not limited thereto.
  • While various aspects of the exemplary embodiments of this disclosure may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the exemplary embodiments of the disclosure may be practiced in various components such as integrated circuit chips and modules. It should thus be appreciated that the exemplary embodiments of this disclosure may be realized in an apparatus that is embodied as an integrated circuit, where the integrated circuit may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor, a digital signal processor, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this disclosure.
  • exemplary embodiments of the disclosure may be embodied in computer-executable instructions, such as in one or more program modules, executed by one or more computers or other devices.
  • program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types when executed by a processor in a computer or other device.
  • the computer executable instructions may be stored on a computer readable medium such as a hard disk, optical disk, removable storage media, solid state memory, random access memory (RAM), etc.
  • the function of the program modules may be combined or distributed as desired in various embodiments.
  • the function may be embodied in whole or partly in firmware or hardware equivalents such as integrated circuits, field programmable gate arrays (FPGA), and the like.

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