WO2020077560A1 - L1 signaling for serving cells - Google Patents

L1 signaling for serving cells Download PDF

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Publication number
WO2020077560A1
WO2020077560A1 PCT/CN2018/110644 CN2018110644W WO2020077560A1 WO 2020077560 A1 WO2020077560 A1 WO 2020077560A1 CN 2018110644 W CN2018110644 W CN 2018110644W WO 2020077560 A1 WO2020077560 A1 WO 2020077560A1
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WO
WIPO (PCT)
Prior art keywords
serving cells
indication
layer
active
signaling message
Prior art date
Application number
PCT/CN2018/110644
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English (en)
French (fr)
Inventor
Tao Yang
Karol Schober
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201880098804.6A priority Critical patent/CN112868261B/zh
Priority to PCT/CN2018/110644 priority patent/WO2020077560A1/en
Publication of WO2020077560A1 publication Critical patent/WO2020077560A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • Embodiments of the present disclosure generally relate to the field of communications, and in particular, to devices, methods, apparatuses and computer readable storage media for scheduling and activating serving cells using Layer 1 (L1) signaling.
  • L1 Layer 1
  • RAN Radio Access Network
  • CA Carrier Aggregation
  • DC Dual Connectivity
  • NR New Radio
  • One of the objectives is to fasten activation and de-activation of serving cells, Bandwidth Part (BWP) switching and corresponding scheduling.
  • BWP Bandwidth Part
  • the efficiency and low latency of serving cell configuration, activation and setup may be enabled by minimizing signaling overhead and latency induced in L1, Layer 2 (L2) or Layer 3 (L3) during initial cell setup, additional cell setup or additional cell activation for data transmission.
  • L2 Layer 2
  • L3 Layer 3
  • This objective is applied in various scenarios of Multi-RAT (Radio Access Technology) DC, NR-NR DC, CA and the like.
  • the enhancements may be achieved in IDLE, INACTIVE and CONNECTED modes.
  • example embodiments of the present disclosure provide devices, methods, apparatuses and computer readable storage media for scheduling and activating serving cells using L1 signaling.
  • a method is provided.
  • a first indication of a first set of active serving cells from a plurality of serving cells is sent by a network device to a terminal device in a first L1 signaling message.
  • a second indication of a second set of active bandwidth parts for the first set of active serving cells is sent to the terminal device in a second L1 signaling message.
  • a third indication of a third set of scheduled active serving cells from the first set of active serving cells is sent to the terminal device in a third L1 signaling message.
  • a computer readable storage medium that stores a computer program thereon.
  • the computer program when executed by a processor of a device, causes the device to perform the method according to the third or fourth aspect.
  • FIG. 1 illustrates an example environment in which example embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates a flowchart of an example method in accordance with some example embodiments of the present disclosure
  • FIG. 4 illustrates a flowchart of an example method in accordance with some other example embodiments of the present disclosure
  • the term “network device” refers to any suitable device at a network side of a communication network.
  • the network device may include any suitable device in an access network of the communication network, for example, including a base station (BS) , a relay, an access point (AP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • gNB NR NodeB
  • RRU Remote Radio Module
  • RH radio header
  • RRH remote radio head
  • a low power node such as a fe
  • the term “terminal device” refers to a device capable of, configured for, arranged for, and/or operable for communications with a network device or a further terminal device in a communication network.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the terminal device may be configured to transmit and/or receive information without direct human interaction.
  • the terminal device may transmit information to the network device on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • Examples of the terminal device include, but are not limited to, user equipment (UE) such as smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , and/or wireless customer-premises equipment (CPE) .
  • UE user equipment
  • LME laptop-embedded equipment
  • CPE wireless customer-premises equipment
  • circuitry may refer to one or more or all of the following:
  • combinations of hardware circuits and software such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/finnware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s)) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • MAC CEs in LTE are used to activate and de-activate a serving cell in NR for the trade-off between fast signaling transmission and signaling accuracy, for example.
  • the latency requirement is more critical in NR.
  • MAC CEs in LTE seem not to be fast enough due to longer L2 signaling caused, for example, by multiple Hybrid Automatic Repeat request (HARQ) retransmissions or necessary communications between different layers, such as L1 or a physical (PHY) layer and L2 or a MAC layer) .
  • HARQ Hybrid Automatic Repeat request
  • BWPs based on DCI has been defined to enable data transmission on different BWPs of a serving cell at different time slots. These BWPs may be jointly scheduled or activated. However, such joint scheduling and activation may not be applied to the case where the multiple active BWPs are active in multiple serving cells, one active BWP in one active serving ceil.
  • Embodiments of the present disclosure provide a novel L1 signaling design to enable simultaneous activation (or de-activation) , scheduling of serving cells and BWP switching.
  • an indication of active serving cells is sent to a terminal device in a L1 signaling message.
  • the L1 signaling message may be sent in any of the active serving ceils.
  • an indication of corresponding active BWPs (one active per serving cell) is sent to the terminal device in this L1 signaling message or a different L1 signaling message.
  • An indication of scheduled ones of the active serving cells is further sent to the terminal device.
  • the indication of the scheduled active serving cells may be sent together with the indication of the active BWPs.
  • active or de-active status of the serving cells, the active BWPs for the active serving cells and the scheduled or non-scheduled status of the active serving cells can be determined based on the indications received in the L1 from the network device.
  • the activation and de-activation of the serving cells and the corresponding BWPs activation/switching/scheduling may be combined.
  • Fast data transmission may be enabled by fast and efficient activation or de-activation of the serving cell (s) and BWP operations.
  • the delay is far shorter compared with the conventional MAC CE-based activation/de-activation operation of serving cells.
  • fast data transmission requirement may be met.
  • signaling overhead for the activation or de-activation of the serving cells and BWPs may be reduced, and therefore higher signaling efficiency may be achieved.
  • the scheduling of the active serving may be more flexible or dynamic.
  • FIG. 1 shows an example environment 100 in which example embodiments of the present disclosure can be implemented.
  • the environment 100 which may be a part of a communication network, comprises a network device 110 and a terminal device 120. It is to be understood that one network device 110 and one terminal device 120 are shown in the environment 100 only for the purpose of illustration, without suggesting any limitation to the scope of the present disclosure.
  • the environment 100 may include any suitable number of network devices and terminal devices adapted for implementing example embodiments of the present disclosure.
  • the terminal device 120 can communicate with the network device 110 or with another terminal device (not shown) directly or via the network device 110.
  • the communication may follow any suitable communication standards or protocols such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) NR, Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, and machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) and ultra-reliable low latency communication (URLLC) technologies.
  • UMTS Universal Mobile Telecommunications
  • the network device 110 by itself or together with other network devices (not shown) can provide a plurality of serving cells.
  • different serving cells may operate on different carriers. These serving cells may be available to the terminal device 120 for communication.
  • the terminal device 120 for the terminal device 120, some of the serving cells are active, and others are de-active.
  • the terminal device 120 can transmit or receive data in the active serving cells.
  • the terminal device 120 can receive at least one L1 signaling message from the network device 110.
  • the L1 signaling message may comprise any suitable signaling message in L1 or the PHY layer, such as a DCI message.
  • the activation or de-activation of the serving cells, the activation of the corresponding BWPs and the scheduling of the active serving cells may be more fast and flexible.
  • FIG. 2 illustrates a flowchart of an example method 200 in accordance with some example embodiments of the present disclosure.
  • the method 200 can be implemented by the network device 110 as shown in FIG. 1.
  • the method 200 will be described with reference to FIG. 1.
  • the network device 110 sends to the terminal device 120 an indication (referred to as a first indication) of a set (referred to as a first set) of active serving cells from a plurality of serving cells in one of one or more L1 signaling messages (referred to as a first L1 signaling message) .
  • the first L1 signaling message may be sent in any of the active serving cells.
  • the first indication can identify which one of the serving cells will be in active status for potential data scheduling. In some example embodiments, the first indication may only identify active serving cells among serving cell configured for the terminal device 120. In some other example embodiments, the first indication may identify active or de-active status of each serving cell configured for the terminal device 120.
  • the first indication may be implemented in any suitable format.
  • the first indication may be contained in an Information Element (IE) (referred to as a first IE) of the first L1 signaling message.
  • IE Information Element
  • the first IE may comprise a plurality of bits indicating active or de-active status of different serving cells.
  • the bits corresponding to the different serving cells may be ordered according to the corresponding carrier indication field (CIF) sequence of the serving cells.
  • CIF carrier indication field
  • a plurality of serving cells may be activated for the terminal device 120 in the CA scenario, and therefore these serving cells may be in active status simultaneously. Accordingly, in the example embodiments where the first indication identifies only the active serving cells, a size (or length) of the first IE may be variable depending on the number of actually/currently active serving cells.
  • blind decoding BD may be performed to detect the first IE, as will be detailed in the following paragraphs with reference to FIG. 4.
  • the first IE may have a predetermined size or length, such as a predetermined number of bits. Each of the bits is used to indicate the active or de-active status of the respective serving cell of the configured serving cells.
  • the predetermined size may be indicated by the network device 110 in a higher layer signaling message, such as a Radio Resource Control (RRC) signaling message.
  • RRC Radio Resource Control
  • the network device 110 may use the higher layer signaling message to transmit an explicit indication of the predetermined size to the terminal device 120.
  • the indication may be implicit.
  • the network device 110 may use other higher layer signaling, for example, for indicating the number of configured cells to implicitly indicate the predetermined size.
  • the predetermined size for example, as the maximum number of cells or carriers allowed for a terminal device in the communication network, based on the terminal device capability.
  • the predetermined size may be determined as the maximum number of cells supported by the communication network in CA, for example, specified in the related standards.
  • the configured serving cells may comprise a primary cell (Pcell) and a set of secondary cells (Scell) where the Pcell is generally in active status.
  • the first set of active serving cells indicated by the first indication may include only the active secondary cells. For example, one bit for the Pcell may be skipped or omitted in the first IE to further reduce the overhead. It is also possible to reserve such a bit in the first IE to align with the Scells. In this situation, this bit may always be set to indicate the active status of the Pcell.
  • the network device 110 sends to the terminal device 120 an indication (referred to as a second indication) of a set (referred to as a second set) of active BWPs for the first set of active serving cells in one of the one or more L1 signaling messages (referred to as a second L1 signaling message) .
  • the second L1 signaling message may or may not be different from the first signaling message.
  • the second indication may be used to switch (or activate) at least one BWP for each active serving cell, for example, for DL measurement and/or data transmission.
  • the second indication may be sent in another IE (referred to as a second IE) of the second L1 signaling message.
  • the second IE may consist of a number of BWP fields. Each of the BWP fields corresponds to an active serving cell and indicates at least one BWP activated for the active serving cell.
  • each BWP field may include a number (for example, N) of bits.
  • N is a positive integer and may depend on the number of BWPs allowed based on capability of a terminal device or based on configured number of BWPs for a serving cell for a terminal device. For example, in the case that one of up to four configured BWPs is active for one active serving cell, 2-bit BWP field may be used.
  • the number of BWP fields may depend on the number of BWPs activated for previously-active serving cells. In this case, the terminal device 120 may be aware of the size of the second IE beforehand and detect this IE accordingly if no additional cell is activated. In some other example embodiments, the number of BWPI fields may equal to the number of configured serving cells to ensure the reliability. Accordingly, all these BWP fields may be ordered according to the corresponding CIF sequences of the active, previously-active or configured serving cells.
  • the BWP field for Pcell may be included in the second IE to identify the BWP (s) activated for the Pcell.
  • Such a BWP field may be located in any predetermined position within the second IE. For example, this BWP field may be arranged at the beginning of this IE.
  • the network device 110 sends to the terminal device 120 an indication (referred to as a third indication) of a set (referred to as a third set) of scheduled active serving cells from the first set of active serving cells in one of the one or more L1 signaling messages (referred to as a third L1 signaling message) .
  • the third L1 signaling message may be the same as the second L1 signaling message. It is also possible that the first, second and third L1 signaling messages are different.
  • the third indication may identify scheduled or non-scheduled status of each active serving cell.
  • the third indication may be sent in a further IE (referred to as a third IE) of the first L1 signaling message.
  • the third IE may comprise a number of resource allocation (RA) fields to indicate resources scheduled (or allocated) to the active serving cells for data transmission and/or reception, for example.
  • the RA fields may explicitly identify the corresponding resource allocation.
  • a predefined special RA value may be used to indicate “not scheduled and DL measurement triggered” serving cell.
  • the terminal device 120 may just perform downlink (DL) measurement or transmit Sounding Reference Signals (SRSs) , that is, no data transmission or reception.
  • SRSs Sounding Reference Signals
  • a further predefined RA value may be used indicated no transmission or reception at all.
  • one dedicated RA field may be included to identify the scheduled status of the active BWP of the Pcell. This field may be arranged at the beginning of the third IE, or other positions.
  • the first, second and third indications may be sent in the same L1 signaling message, or in different L1 signaling messages. If the three indications are included in one L1 signaling message (for example, one DCI message) , only one round of a L1 signaling procedure is needed to activate and schedule a serving cell as well as its corresponding BWP, thereby allowing fast data transmission and reception and short delay for data transmission. Meanwhile, the DL control overhead may be reduced significantly.
  • the BD may be used for decoding the L1 signaling message since the sizes (or lengths or the numbers of bits) of the first, second and third IEs may be dynamically changed depending on the number of active serving cells.
  • the first indication may be contained in one of two L1 signaling messages, and the second and third indications may be contained in the other of the two L1 signaling messages.
  • the first indication may be sent only when necessary, for example, only when the active or de-active status of the serving cells changes.
  • the sizes of the second and third IEs are associated with the size of the first IE, the size of the second and third IEs may be implicitly indicated by the size of the first IE.
  • FIG. 3 illustrates an example process 300 of transmitting two L1 signaling messages to indicate the active or de-active status of the serving cells and the corresponding active BWPs and resources in accordance with some example embodiments of the present disclosure.
  • the terminal device 120 is configured with two serving cells operating in different component carriers (CCs) , respectively referred to as CC#0 and CC#1.
  • CC#0 is primary
  • CC#1 is secondary.
  • a L1 signaling message 304 is transmitted on an active BWP (for example, BWP#0) of CC#0 in Physical Downlink Shared Channel (PDSCH) to indicate that CC#0 is active and CC#1 is not active.
  • a L1 signaling message 306 is also transmitted in the PDSCH to indicate the RA for BWP#0 of CC#0.
  • a L1 signaling message 310 is sent on BWP#0 of CC#0 to indicate new RA scheduled for BWP#0 of CC#0.
  • the active status of the serving cells are not changed, and thus the L1 signaling message indicating active status of the serving cells is not transmitted.
  • a L1 signaling message 314 is sent on BWP#0 of CC#0 to indicate that both CC#0 and CC#1 are active.
  • a L1 signaling message 316 is sent to indicate the resources scheduled for BWP#0 of CC#0 and BWP#0 of CC#1.
  • the RA field corresponding to CC#1 indicates with special predetermined value that only measurement is triggered on BWP#0 of CC#1 but no data are scheduled, as shown.
  • L1 signaling messages 318 and 320 are sent on BWP#0 of CC#1 in time slots 322 and 324 (for example, slot#3 and slot#4) to indicate the resources newly scheduled for BWPs of CC#0 and CC#1.
  • the RA field in the L1 signaling message 318 indicates with special predetermined value of corresponding RA field that BWP#0 of CC#1 is not scheduled.
  • the L1 signaling messages for indicating the active status of the serving cell and the corresponding scheduled resource and BWP is shown to be sent in the same time slot only for the purpose of illustration, without suggesting any limitation. In other implementations, the L1 signaling messages may be sent in different time slots.
  • the terminal device 120 may identify the active status of each configured serving cell, and ma also identify the active BWP of each active serving cell as well as the scheduled status and resource allocation of the active serving cells. Accordingly, different behaviors and operations will be taken at the terminal device 120 in different situations. For example, for active and scheduled serving cells, the terminal device 120 may conduct data reception or transmission. For active but non-scheduled serving cells, the terminal device 120 may just perform the DL measurement or SRS transmissions. In addition, the terminal device 120 may stop all activities on the non-active serving cell.
  • FIG. 4 shows a flowchart of an example method 400 in accordance with some example embodiments of the present disclosure.
  • the method 400 can be implemented by the terminal device 120 as shown in FIG. 1.
  • the method 400 will be described with reference to FIG. 1.
  • the terminal device 120 receives the first indication of the first set of active serving cells in the first L1 signaling message in any of the active serving cells.
  • the terminal device 120 may detect the first IE, and then obtain the first indication from the first IE.
  • the terminal device 120 may identify the active or de-active status of each configured serving cell.
  • the size of the first IE may be dynamically changed depending on the number of active serving cells.
  • the terminal device 120 may perform the BD for decoding the L1 signaling message.
  • the terminal device 120 may detect the first IE based on the predetermined size. For example, the terminal device 120 may receive an explicit indication of the predetermined size in higher layer signaling or determine implicitly the predetermined size from other parameter (s) received in higher layer signaling, such as RRC signaling, from the network device 110.
  • the predetermined size is related to the maximum number of configured serving cells which is specified in the communication network or based on the reported capability by the terminal device 120, and the terminal device 120 is aware of the size in advance.
  • the terminal device 120 receives from the network device 110 the second indication of the second set of active BWPs for the first set of active serving cells in the second L1 signaling message.
  • the terminal device 120 may detect the second IE, and then obtain the second indication from the second IE. In this way, for active serving cell, the terminal device 120 may identify which configured BWP may be switched or activated for the following data transmission.
  • the terminal device 120 may further check the active BWP for all active serving cell based on the second indication. The final behavior of the terminal device 120 may depend on the third indication.
  • the terminal device 120 receives from the network device 110 the third indication of the third set of scheduled active serving cells in the L1 signaling message.
  • the terminal device 120 may detect the third IE, and then obtain the third indication from the third IE.
  • the terminal device 120 may identify whether or not the corresponding active BWP is scheduled for data transmission, for example, based on whether RA field (s) indicates the valid resource allocation, such as at least one scheduled resource block (RB) or physical resource block (PRB) , or not.
  • RA field (s) indicates the valid resource allocation, such as at least one scheduled resource block (RB) or physical resource block (PRB) , or not.
  • the terminal device 120 may perform data reception or transmission according to the RA and other scheduling information on the corresponding active BWP.
PCT/CN2018/110644 2018-10-17 2018-10-17 L1 signaling for serving cells WO2020077560A1 (en)

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CN201880098804.6A CN112868261B (zh) 2018-10-17 2018-10-17 服务小区的l1信令
PCT/CN2018/110644 WO2020077560A1 (en) 2018-10-17 2018-10-17 L1 signaling for serving cells

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