Wake-up signal transmission and reception
By configuring a wake-up signal configuration that specifies monitoring occasions for control channels, the challenges of wake-up signal transmission and on-demand system information block reception in wireless communication systems are addressed, achieving efficient network operation and user connectivity.
Patent Information
- Application Number
- PCT/CN2024/101807
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-06-19
AI Technical Summary
Current techniques for transmitting and receiving wake-up signals in wireless communication systems face challenges in determining and specifying higher layer parameters for functionalities such as wake-up signal transmission, on-demand system information block reception, and network response.
The proposed solution involves configuring a wake-up signal (WUS) configuration that indicates a monitoring occasion of a control channel, allowing communication devices to transmit WUS and monitor control channels in response, thereby enabling efficient on-demand system information block reception.
This approach allows the network to harvest energy savings while ensuring user equipment can receive system information blocks and camp on the cell when requested, improving network efficiency and user connectivity.
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Figure CN2024101807_19062025_PF_FP_ABST
Abstract
Description
WAKE-UP SIGNAL TRANSMISSION AND RECEPTIONTECHNICAL FIELD
[0001] This document is directed generally to digital wireless communications.BACKGROUND
[0002] Mobile telecommunication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a more complex and sophisticated range of access requirements and flexibilities.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless system, known as 5G, advances the LTE and LTE-A wireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs.SUMMARY
[0004] Techniques are disclosed for transmitting / receiving of an uplink (UL) wake-up signal (WUS) configuration, transmitting / receiving WUS, and / or transmitting / receiving a control channel (e.g., physical downlink control channel (PDCCH) and / or on-demand system information block (e.g., system information block type 1 (SIB1) ) .
[0005] A first example wireless communication method includes receiving, by a communication device, a configuration for a wake-up signal (WUS) , where the configuration indicates a monitoring occasion of a control channel that is to be received from a network device; transmitting the WUS to the network device; and monitoring, by the communication device, the control channel in response to transmitting the WUS.
[0006] In some embodiments, the monitoring occasion of the control channel is determined by at least one of a time window, a reference point, a number of monitoring occasions of the control channel, a periodicity of the system information block, or a number of times that the system information block is transmitted. In some embodiments, a start of the time window is a first subframe of a system frame number (SFN) , wherein SFN modulo T = N1, wherein T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, a start of the time window is a subframe or a slot in a radio frame for which a system frame number (SFN) modulus T = N1, where T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, the time window starts at an offset from the reference point, and the communication device monitors the control channel thorough which a system information block is received by the communication device from a first occasion in which the control channel is to be received in the time window.
[0007] In some embodiments, a subframe or a slot when the communication device transmits the WUS is the reference point. In some embodiments, the offset is indicated in the configuration or is pre-configured. In some embodiments, the time window starts at the reference point, an occasion where the control channel is to be received is after the reference point, and the occasion is configured by one or more information elements in a master information block (MIB) or another system information block received by the communication device. In some embodiments, a start of the time window is aligned with an occasion where the control channel is to be received for scheduling the system information block. In some embodiments, a time slot at a first cell is aligned with another time slot at a network energy savings cell, and the occasion is configured by the network energy saving cell. In some embodiments, a time slot at a first cell is one time offset away from another time slot at a network energy savings cell, the start of the time window is one time offset away relative to the occasion where the control channel is to be received, and the time offset is pre-determined.
[0008] In some embodiments, a random access response (RAR) message is received by the communication device in response to the transmitting the WUS, and the RAR message indicates the monitoring occasion of the control channel to be received from the network device. In some embodiments, the RAR message indicates one or more time domain resources of the time window, and the one or more time domain resources includes a start and / or a duration of the time window. In some embodiments, the WUS is transmitted until a number of repetitions is reached, the monitoring occasion of the control channel starts at the reference point, and the reference point is a first occasion when the WUS is transmitted until the number of repetitions is reached, or the reference point is a last occasion when the WUS is transmitted when the number of repetitions is reached. In some embodiments, the method further comprises receiving, by the communication device, a random access response (RAR) message in response to transmitting the WUS; retransmitting the WUS; monitoring, by the communication device in response to retransmitting the WUS, the monitoring occasion in which another control channel is to be received; and monitoring another RAR message.
[0009] In some embodiments, the configuration includes a length of a time window in which the control channel is to be received from the network device; and the communication device receives the control channel and a system information block within the length of the time window, the system information block is associated with a single periodicity and is received once, or the system information block is associated with multiple periodicity and is received multiple times, and each system information block is scheduled by the control channel received by the communication device within the time window.
[0010] In some embodiments, the length of the time window is based on the single periodicity or the multiple periodicity of the system information block. In some embodiments, the length of the time window is based on a periodicity of the control channel configured in the another configuration received from the network device. In some embodiments, the another configuration includes a unit of time associated with the time window, and the unit of time is one millisecond, one minute, or one slot. In some embodiments, the length of the time window is received in a random access channel response (RAR) message. In some embodiments, a timer starts at an end of the time window, and wherein the communication device does not monitor an occasion for another control channel for scheduling another system information block until the timer expires.
[0011] In some embodiments, the another configuration comprises multiple window lengths is configured, the multiple window lengths comprises the length of the time window in which the control channel is received, and in response to the communication device receiving a random access response (RAR) message, the communication device adopts a first window length to monitor the control channel scrambled by a system information radio network temporary identifier (SI-RNTI) , and in response to the communication device receiving the control channel scrambled with the SI-RNTI, the communication device adopts a second window length for subsequent control channel monitoring for scheduling subsequent system information block. In some embodiments, the control channel includes a physical downlink control channel (PDCCH) . In some embodiments, the control channel is configured to carry control information that schedules a system information block.
[0012] A second example wireless communication method includes transmitting, by a network device to a communication device, a configuration for a wake-up signal (WUS) , where the configuration indicates a monitoring occasion of a control channel that is to be transmitted from a network device; receiving, by the network device, the WUS; and transmitting, by the network device, the control channel in response to receiving the WUS.
[0013] In some embodiments, the monitoring occasion of the control channel is determined by at least one of a time window, a reference point, a number of monitoring occasions of the control channel, a periodicity of the system information block, or a number of times that the system information block is transmitted. In some embodiments, a first monitoring occasion is at a first subframe of a system frame number (SFN) , wherein SFN modulo T = N1, wherein T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, a first monitoring occasion is at a subframe or a slot in a radio frame for which a system frame number (SFN) modulus T = N1, where T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, the monitoring occasion starts at an offset from the reference point.
[0014] In some embodiments, the offset is indicated in the configuration or is pre-configured. In some embodiments, the time window starts at the reference point, an occasion where the control channel is to be received by the communication device is after the reference point, and the occasion is configured by one or more information elements in a master information block (MIB) or another system information block transmitted by the network device to the communication device. In some embodiments, a start of the time window is aligned with an occasion where the control channel is to be received for scheduling the system information block. In some embodiments, a time slot at a first cell is aligned with another time slot at a network energy savings cell, and the occasion is configured by the network energy saving cell. In some embodiments, a time slot at a first cell is one time offset away from another time slot at a network energy savings cell, the start of the time window is one time offset away relative to the occasion where the control channel is to be received, and the time offset is pre-determined.
[0015] In some embodiments, a random access response (RAR) message is transmitted by the network device in response to the receiving the WUS, and the RAR message indicates the monitoring occasion of the control channel to be transmitted by the network device. In some embodiments, the RAR message indicates one or more time domain resources of the time window, and the one or more time domain resources includes a start and / or a duration of the time window. In some embodiments, the WUS is received until a number of repetitions is reached, the monitoring occasion of the control channel starts at the reference point, and the reference point is a first occasion when the WUS is transmitted by the communication device until the number of repetitions is reached, or the reference point is a last occasion when the WUS is transmitted by the communication device when the number of repetitions is reached.
[0016] In some embodiments, the method further comprises transmitting, by the network device, a random access response (RAR) message in response to receiving the WUS; receiving another WUS; transmitting, by the network device in response to receiving the another WUS, another control channel; and transmitting another RAR message. In some embodiments, the configuration includes a length of a time window, the network device transmits the control channel and a system information block to be received by the communication device within the length of the time window, the system information block is associated with a single periodicity and is transmitted once, or the system information block is associated with multiple periodicity and is transmitted multiple times, and each system information block is scheduled by the control channel to be received by the communication device within the time window.
[0017] In some embodiments, the length of the time window is based on the single periodicity or the multiple periodicity of the system information block. In some embodiments, the length of the time window is based on a periodicity of the control channel configured in the another configuration transmitted by the network device. In some embodiments, the another configuration includes a unit of time associated with the time window, and the unit of time is one millisecond, one minute, or one slot. In some embodiments, the length of the time window is transmitted in a random access channel response (RAR) message. In some embodiments, the another configuration comprises multiple window lengths is configured, the multiple window lengths comprises the length of the time window in which the control channel is to be received by the communication device, and in response to the network device transmitting a random access response (RAR) message, the network device transmits the control channel scrambled by a system information radio network temporary identifier (SI-RNTI) . In some embodiments, the control channel includes a physical downlink control channel (PDCCH) . In some embodiments, the control channel is configured to carry control information that schedules a system information block.
[0018] In yet another exemplary aspect, the above-described methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium. The code included in the computer readable storage medium when executed by a processor, causes the processor to implement the methods described in this patent document.
[0019] In yet another exemplary embodiment, a device that is configured or operable to perform the above-described methods is disclosed.
[0020] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.
[0021] BRIEF DESCRIPTION OF THE DRAWING
[0022] FIG. 1 shows an example scenario that include a cell and two network energy savings (NES) cells.
[0023] FIG. 2 shows physical downlink control channel (PDCCH) monitoring occasions is configured at two consecutive slots in each radio frame.
[0024] FIG. 3 shows one PDCCH monitoring occasion is located at two symbols in one slot.
[0025] FIG. 4A shows an example flowchart for monitoring a control channel.
[0026] FIG. 4B shows an example flowchart for transmitting a control channel.
[0027] FIG. 5 shows an exemplary block diagram of a hardware platform that may be a part of a network device or a communication device.
[0028] FIG. 6 shows an example of wireless communication including a base station (BS) and user equipment (UE) based on some implementations of the disclosed technology.DETAILED DESCRIPTION
[0029] In order to harvest network energy saving, periodic system information block type 1 (SIB1) transmission can be reduced or cancelled for idle / inactive user equipment (UE) in a cell. However, once UE requests to camp on this network energy savings (NES) cell (e.g., NES Cell-1 in FIG. 1) and attempts to transmit data in this cell, UE can send uplink (UL) wake-up signal (WUS) to inform gNB (e.g., gNB at Cell A or gNB at NES cell in FIG. 1) to send on-demand SIB1, and the on-demand SIB1 follow certain properties.
[0030] Current techniques for transmitting or receiving WUS has some technical problems such as how to determine and specify higher layer parameters for functionalities such as WUS transmission / on-demand SIB1 reception / network response. Thus, there is a technical need for detailed solutions from UE side perspective regarding WUS transmission / PDCCH monitoring corresponding to on-demand SIB1 reception, and response reception. For example, for on-demand SIB1 reception / PDCCH monitoring, UL WUS configuration for on-demand SIB1 request may include parameters that determines where is monitoring occasion of the control channel, and the control channel convey control information e.g, PDCCH, scheduling on-demand SIB1, etc., where the UL WUS configuration is transmitted by the base station (BS) and received by the UE.
[0031] This patent document describes techniques to determine and / or specify the UL WUS configuration for functionalities such as WUS transmission and / or on-demand SIB1 reception or network response. One of the technical benefits of the solutions described in this patent document is that the network can harvest energy saving gain, and in the meanwhile, the mechanism of network ensures that UE can receive SIB1 and camp on the cell if UE requests via NES cell.
[0032] The example headings for the various sections below are used to facilitate the understanding of the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section can be combined with one or more features of another example section. Furthermore, 5G terminology is used for the sake of clarity of explanation, but the techniques disclosed in the present document are not limited to 5G technology only, and may be used in wireless systems that implemented other protocols.
[0033] I. (a) . Embodiment A
[0034] In some embodiments, extra time offset may be pre-determined when timeline (absolute time of slot n) of cell A is one time offset relative to the timeline (absolute time of slot n) of network energy saving cell (named as NES cell) . In some embodiments, parameter on which occasion UE starts to monitor, or parameter of time window is configured at cell A, and type 0 PDCCH monitoring occasion is configured at NES cell.
[0035] In all embodiments, time window can be replaced by the occasions UE starts and continues to monitor, in which the PDCCH scheduling on-demand SIB1 may be received.
[0036] Case A-1 UE transmits UL WUS -> UE monitors PDCCH occasion
[0037] The BS transmits to the UE the UL WUS configuration for on-demand SIB1 request, where the UL WUS configuration include parameters: start of time window and / or periodicity of on-demand SIB1. The start of the time window in the configuration may include a start of time instance of the time window. The UE transmits the WUS signal that requests SIB1 from the BS, and BS may transmit SIB1 in response. The UE can receive the SIB1 in the time window which is determined by UL WUS configuration. The UL WUS configuration may include parameters for transmitting UL WUS, and also for other related procedures, e.g., receiving PDCCH and SIB. The UE can receive PDCCH and on-demand SIB1 in the time window, where the PDCCH can indicate where the on-demand SIB1 is to be received.
[0038] Case a: start of time window is at SFN #x. For example, UE starts to monitor PDCCH occasion at the first subframe of SFN #x, wherein x%T = N1 (or (SFN#x modulo T) = N1) . T is periodicity of on-demand SIB1. For example, N1 = 0.
[0039] Case a1: revise the method in legacy specification / standard, (legacy specification is for on-demand SI)
[0040] The start (subframe, slot) of time window of on-demand SIB1 transmission is determined by an algorithm defined as follows. The configuration received by the UE includes the subframe or slot where the time window starts.
[0041] When acquiring or to acquire an on-demand SIB1 message, the UE can:
[0042] 1> determine the start of the SI-window for SIB1 as follows:
[0043] 2> the SI-window starts at the subframe #a, in the radio frame for which SFN mod T =0, where T is the Periodicity of on-demand SIB1;
[0044] Case b: for one UE, UE transmits UL WUS, then UE monitors PDCCH occasion in time window
[0045] In some embodiments, time window starts at a pre-configured offset from / relative to one reference point, where the pre-configured offset is previously known to the UE. In some other embodiments, time window starts at a configured offset from / relative to one reference point, where information about the offset is included in the UL WUS configuration received by the UE. In one embodiment, the slot when UE transmits UL WUS is reference point. An offset can be configured in UL WUS configuration, e.g., an offset is one or multiple slots. (slot is corresponding to SCS of PDCCH at NES cell where transmits UL WUS) . UE starts PDCCH monitoring for on-demand (OD) SIB1 from first PDCCH occasion in time window, where the first PDCCH occasion is first in order. The reference point may be reconfigured or may be configured by the UL WUS configuration received by the UE. As explained in this patent document, the reference point may be a start or end of the random access response (RAR) window or when the UE transmits the UL WUS.
[0046] In some embodiments, the reference point is at cell A. For example, for FR1, the subframe when UE receive UL WUS configuration is reference point. For another example, for FR2, the slot when UE receive UL WUS configuration is reference point.
[0047] In some embodiments, time window starts at a offset from / relative to one reference point, wherein the offset contains a pre-configured offset and a time difference between cell A and NES cell.
[0048] Case c1: Time window starts the slot after at one reference point, (UE find one PDCCH occasion after reference point) PDCCH occasions is configured by searchSpaceZero, controlResourceSetZero. The IE searchSpaceZero defines time resources or configuration for receiving PDCCH. The IE controlResourceSetZero defines frequency resources or configuration for receiving PDCCH.
[0049] In some embodiments, the configuration of searchSpaceZero, controlResourceSetZero is in MIB of one cell (which would transmit on-demand SIB1) ; in some other embodiments, the configuration of searchSpaceZero, controlResourceSetZero is in SIBx of one cell (which transmit SSB and SIB1 normally; it is also named as cell A) .
[0050] CORESET 0 Position in Time Domain indicates which slot and which symbol the PDCCH monitoring occasion is located as shown in following figures.
[0051] FIG. 2 shows PDCCH monitoring occasions is configured at two consecutive slots in each radio frame.
[0052] FIG. 3 shows one PDCCH monitoring occasion is located at two symbols in one slot.
[0053] Case c2: start of time window is aligned with one PDCCH monitoring occasion for scheduling on-demand SIB1
[0054] In one embodiment, time slot n at cell A is aligned with slot n at NES cell, the start of time window can be aligned with one PDCCH monitoring occasion configured by NES cell.
[0055] In one embodiment, time slot n at cell A is one time offset from slot n at NES cell, the start of time window can be one time offset relative to one PDCCH monitoring occasion configured by NES cell. And the time offset is pre-determined.
[0056] Case d: for One UE, UE transmits UL WUS, then UE monitors PDCCH occasion in time window.
[0057] Random access response (RAR) message of UL WUS transmission indicates time domain resource of the time window, e.g., start / duration,
[0058] Case d1: RAR indicates time domain information of PDCCH occasions which UE monitors,
[0059] Case d2: RAR indicates time domain information of on-demand SIB1 transmission, Case A-2, UE transmits UL WUS Repetition -> UE monitors PDCCH occasion
[0060] The base station can transmit in the UL WUS configuration to the UE information about the number of repetitions of the UL WUS. Based on method in case A-1, assume UL WUS repetition is supported, time window start at one reference point.
[0061] Case a: reference point is the first occasion of repetition transmission of WUS.
[0062] Case b: reference point is the last occasion of repetition transmission of WUS.
[0063] Case c: reference point is one offset from the first or last occasion of repetition transmission of WUS.
[0064] Case A-3, UE transmit UL WUS -> RAR received from base station -> UE retransmit UL WUS -> monitor PDCCH occasion in which there is control information scheduling SIB1, monitor RAR
[0065] Based on method in case A-1,
[0066] Case a: Reference point is the start / end of RAR window, if RAR is successfully received.
[0067] Case b: In another case, if RAR was not received in RAR window, UE re-transmits UL WUS. reference point of the time window for monitoring PDCCH occasion for scheduling on-demand SIB1 is the start / end of RAR window, if RAR is successfully received.
[0068] Case c: UE monitors PDCCH occasion for RAR, then UE starts to monitor from first PDCCH monitoring occasion configured by pdcch-ConfigSIB1.
[0069] Starting time of time window is determined by the end of RAR.
[0070] Case A-4, UE transmit UL WUS -> RAR received from base station -> monitor PDCCH occasion in which there is control information scheduling SIB1, monitor RAR
[0071] Case a: UE monitors PDCCH scrambled by SI-RNTI, RAR-RNTI in different search space after UE trigger UL WUS transmission.
[0072] Case b: when UE receives PDCCH scrambled by SI-RNTI, UE expect on-demand SIB1 is scheduled in a time window. And UE stop monitor PDCCH scrambled by RAR-RNTI, or UE does not expect gNB transmits RAR after PDCCH scramble by SI-RNTI.
[0073] I. (b) . Embodiment B
[0074] The base station transmits in the UL WUS configuration the SIB1-Windowlength, where SIB1-Windowlength is the duration of the time window where on-demand SIB1 transmissions start and ends. In the time window, there are more than one periodicity of on-demand SIB1 transmissions, and each on-demand SIB1 is scheduled by PDCCH within the time window. UE does not expect to monitor PDCCH occasion for scheduling on-demand SIB1 out of this time window.
[0075] In another embodiment, SIB1-Windowlength is the duration of the time window where PDCCH scheduling on-demand SIB1, and contains single periodicity of on-demand SIB1 transmission.
[0076] Case a: The unit and value of SIB1-Windowlength of the time window Alt 1: SIB1-Windowlength is based on one or multiple of on-demand SIB1 periodicity,
[0077] - T is periodicity of on-demand SIB1
[0078] T can be rf8 rf16, rf32, rf64, rf128, rf256, rf512, where rf means radio frames. In one embodiment, SIB1-Windowlength is based on multiple of certain periodicity, e.g., default value 20ms.
[0079] Alt 2: based on PDCCH monitoring Slot Periodicity configured in (network energy savings (NES) cell Search space #0, CORSET 0) . The base station indicates the NES cell Search space #0 and CORSET 0 in the UL WUS configuration or system information.
[0080] Alt 3: unit of SIB1-Windowlength is 1 millisecond, 1 minute, 1 slot (based on configured SCS of PDCCH)
[0081] SIB1-Windowlength is s5, s10, s20, s40, s80, s160, s320, s640, s1280, s2560, 5120, s means slot.
[0082] Case b: Random access channel response (RAR) message contains scheduling information, which includes or indicates SIB1-Windowlength
[0083] In another embodiment, RAR indicates on-demand SIB1 rejection, cell barring, cell list for cell re-selection.
[0084] Case c: define one Prohibit timer, the timer start at the end of the Time window. When the prohibit timer is running, UE does not expect to monitor PDCCH occasion for scheduling on-demand SIB1 until prohibit timer expires.
[0085] Prohibit timer for requesting SIB1 on-demand while in RRC_IDLE / INACTIVE.
[0086] In another embodiment, if UE receive RAR, and not receive on-demand SIB1, UE is not allowed to transmit UL WUS. If UE does not received on-demand SIB1 within the time window, UE is considered as barred by this NES cell.
[0087] Case d: multiple SIB1-Windowlength
[0088] When UE receives RAR, UE adopts first SIB1-Windowlength for PDCCH scrambling by SI-RNTI.
[0089] When UE receives PDCCH scrambling by SI-RNTI. UE adopts second SIB1-Windowlength for subsequent PDCCH monitoring for scheduling on-demand SIB1.
[0090] In some embodiments where an information element (IE) with multiple SIB1-Windowlength is configured, then when UE receives RAR, UE adopts first SIB1-Windowlength for PDCCH scrambling by SI-RNTI, and when UE receives PDCCH scrambling by SI-RNTI. UE adopts second SIB1-Windowlength for subsequent PDCCH monitoring for scheduling on-demand SIB1.
[0091] I. (c) . Other Example Embodiments
[0092] Case a: the configuration of searchSpaceZero, controlResourceSetZero is in SIBx of one cell (which transmit SSB and SIB1 normally) . The controlResourceSetZero contains multiplexing pattern between control resource set on demand SIB1 and SSB from time / frequency domain perspective, which following existing multiplexing pattern e.g., TDM, FDM.
[0093] Case b: UL WUS configuration for on-demand SIB1 request NOT need to include parameters: frequency domain and code domain parameter for WUS transmission.
[0094] I. (d) . Embodiment C
[0095] Case c-1
[0096] Parameters / contents for the on-demand SIB1 acquisition is as follows.
[0097] FIG. 4A shows an example flowchart for monitoring a control channel. Operation 402 includes receiving, by a communication device, a configuration for a wake-up signal (WUS) , where the configuration indicates a monitoring occasion of a control channel that is to be received from a network device. Operation 404 includes transmitting the WUS to the network device. Operation 406 includes monitoring, by the communication device, the control channel in response to transmitting the WUS.
[0098] In some embodiments, the monitoring occasion of the control channel is determined by at least one of a time window, a reference point, a number of monitoring occasions of the control channel, a periodicity of the system information block, or a number of times that the system information block is transmitted. In some embodiments, a start of the time window is a first subframe of a system frame number (SFN) , wherein SFN modulo T = N1, wherein T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, a start of the time window is a subframe or a slot in a radio frame for which a system frame number (SFN) modulus T = N1, where T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, the time window starts at an offset from the reference point, and the communication device monitors the control channel thorough which a system information block is received by the communication device from a first occasion in which the control channel is to be received in the time window.
[0099] In some embodiments, a subframe or a slot when the communication device transmits the WUS is the reference point. In some embodiments, the offset is indicated in the configuration or is pre-configured. In some embodiments, the time window starts at the reference point, an occasion where the control channel is to be received is after the reference point, and the occasion is configured by one or more information elements in a master information block (MIB) or another system information block received by the communication device. In some embodiments, a start of the time window is aligned with an occasion where the control channel is to be received for scheduling the system information block. In some embodiments, a time slot at a first cell is aligned with another time slot at a network energy savings cell, and the occasion is configured by the network energy saving cell. In some embodiments, a time slot at a first cell is one time offset away from another time slot at a network energy savings cell, the start of the time window is one time offset away relative to the occasion where the control channel is to be received, and the time offset is pre-determined.
[0100] In some embodiments, a random access response (RAR) message is received by the communication device in response to the transmitting the WUS, and the RAR message indicates the monitoring occasion of the control channel to be received from the network device. In some embodiments, the RAR message indicates one or more time domain resources of the time window, and the one or more time domain resources includes a start and / or a duration of the time window. In some embodiments, the WUS is transmitted until a number of repetitions is reached, the monitoring occasion of the control channel starts at the reference point, and the reference point is a first occasion when the WUS is transmitted until the number of repetitions is reached, or the reference point is a last occasion when the WUS is transmitted when the number of repetitions is reached. In some embodiments, the method further comprises receiving, by the communication device, a random access response (RAR) message in response to transmitting the WUS; retransmitting the WUS; monitoring, by the communication device in response to retransmitting the WUS, the monitoring occasion in which another control channel is to be received; and monitoring another RAR message.
[0101] In some embodiments, the configuration includes a length of a time window in which the control channel is to be received from the network device; and the communication device receives the control channel and a system information block within the length of the time window, the system information block is associated with a single periodicity and is received once, or the system information block is associated with multiple periodicity and is received multiple times, and each system information block is scheduled by the control channel received by the communication device within the time window.
[0102] In some embodiments, the length of the time window is based on the single periodicity or the multiple periodicity of the system information block. In some embodiments, the length of the time window is based on a periodicity of the control channel configured in the another configuration received from the network device. In some embodiments, the another configuration includes a unit of time associated with the time window, and the unit of time is one millisecond, one minute, or one slot. In some embodiments, the length of the time window is received in a random access channel response (RAR) message. In some embodiments, a timer starts at an end of the time window, and wherein the communication device does not monitor an occasion for another control channel for scheduling another system information block until the timer expires.
[0103] In some embodiments, the another configuration comprises multiple window lengths is configured, the multiple window lengths comprises the length of the time window in which the control channel is received, and in response to the communication device receiving a random access response (RAR) message, the communication device adopts a first window length to monitor the control channel scrambled by a system information radio network temporary identifier (SI-RNTI) , and in response to the communication device receiving the control channel scrambled with the SI-RNTI, the communication device adopts a second window length for subsequent control channel monitoring for scheduling subsequent system information block. In some embodiments, the control channel includes a physical downlink control channel (PDCCH) . In some embodiments, the control channel is configured to carry control information that schedules a system information block.
[0104] FIG. 4B shows an example flowchart for transmitting a control channel. Operation 452 includes transmitting, by a network device to a communication device, a configuration for a wake-up signal (WUS) , where the configuration indicates a monitoring occasion of a control channel that is to be transmitted from a network device. Operation 454 includes receiving, by the network device, the WUS. Operation 456 includes transmitting, by the network device, the control channel in response to receiving the WUS.
[0105] In some embodiments, the monitoring occasion of the control channel is determined by at least one of a time window, a reference point, a number of monitoring occasions of the control channel, a periodicity of the system information block, or a number of times that the system information block is transmitted. In some embodiments, a first monitoring occasion is at a first subframe of a system frame number (SFN) , wherein SFN modulo T = N1, wherein T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, a first monitoring occasion is at a subframe or a slot in a radio frame for which a system frame number (SFN) modulus T = N1, where T is the periodicity of the system information block, wherein N1 is a predetermined integer. In some embodiments, the monitoring occasion starts at an offset from the reference point.
[0106] In some embodiments, the offset is indicated in the configuration or is pre-configured. In some embodiments, the time window starts at the reference point, an occasion where the control channel is to be received by the communication device is after the reference point, and the occasion is configured by one or more information elements in a master information block (MIB) or another system information block transmitted by the network device to the communication device. In some embodiments, a start of the time window is aligned with an occasion where the control channel is to be received for scheduling the system information block. In some embodiments, a time slot at a first cell is aligned with another time slot at a network energy savings cell, and the occasion is configured by the network energy saving cell. In some embodiments, a time slot at a first cell is one time offset away from another time slot at a network energy savings cell, the start of the time window is one time offset away relative to the occasion where the control channel is to be received, and the time offset is pre-determined.
[0107] In some embodiments, a random access response (RAR) message is transmitted by the network device in response to the receiving the WUS, and the RAR message indicates the monitoring occasion of the control channel to be transmitted by the network device. In some embodiments, the RAR message indicates one or more time domain resources of the time window, and the one or more time domain resources includes a start and / or a duration of the time window. In some embodiments, the WUS is received until a number of repetitions is reached, the monitoring occasion of the control channel starts at the reference point, and the reference point is a first occasion when the WUS is transmitted by the communication device until the number of repetitions is reached, or the reference point is a last occasion when the WUS is transmitted by the communication device when the number of repetitions is reached.
[0108] In some embodiments, the method further comprises transmitting, by the network device, a random access response (RAR) message in response to receiving the WUS; receiving another WUS; transmitting, by the network device in response to receiving the another WUS, another control channel; and transmitting another RAR message. In some embodiments, the configuration includes a length of a time window, the network device transmits the control channel and a system information block to be received by the communication device within the length of the time window, the system information block is associated with a single periodicity and is transmitted once, or the system information block is associated with multiple periodicity and is transmitted multiple times, and each system information block is scheduled by the control channel to be received by the communication device within the time window.
[0109] In some embodiments, the length of the time window is based on the single periodicity or the multiple periodicity of the system information block. In some embodiments, the length of the time window is based on a periodicity of the control channel configured in the another configuration transmitted by the network device. In some embodiments, the another configuration includes a unit of time associated with the time window, and the unit of time is one millisecond, one minute, or one slot. In some embodiments, the length of the time window is transmitted in a random access channel response (RAR) message. In some embodiments, the another configuration comprises multiple window lengths is configured, the multiple window lengths comprises the length of the time window in which the control channel is to be received by the communication device, and in response to the network device transmitting a random access response (RAR) message, the network device transmits the control channel scrambled by a system information radio network temporary identifier (SI-RNTI) . In some embodiments, the control channel includes a physical downlink control channel (PDCCH) . In some embodiments, the control channel is configured to carry control information that schedules a system information block.
[0110] In this patent document, the secondary cell can be (or can be replaced by) primary cell, cell, serving cell, carrier, frequency band, bandwidth part, frequency resource element. In this patent document, the primary cell can be (or can be replaced by) cell, serving cell, carrier, frequency band, bandwidth part, frequency resource element. In this patent document, the carrier can be (or can be replaced by) a cell, serving cell, frequency band, bandwidth part, frequency resource element. In this patent document, the SSB can be (or can be replaced by) a secondary synchronization signal, a primary synchronization signal, a synchronization signal, a signal for measurement, a signal for idle / inactive mode UE, a signal for connected mode UE, PBCH, MIB etc.
[0111] FIG. 5 shows an exemplary block diagram of a hardware platform 500 that may be a part of a network device (e.g., base station) or a communication device (e.g., a user equipment (UE) ) . The hardware platform 500 includes at least one processor 510 and a memory 505 having instructions stored thereupon. The instructions upon execution by the processor 510 configure the hardware platform 500 to perform the operations described in FIGS. 1 to 4B and 6 and in the various embodiments described in this patent document. The transmitter 515 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user equipment. The receiver 520 receives information or data transmitted or sent by another device. For example, a user equipment can receive a message from a network device.
[0112] The implementations as discussed above will apply to a wireless communication. FIG. 6 shows an example of a wireless communication system (e.g., a 5G or NR cellular network) that includes a base station 620 and one or more user equipment (UE) 611, 612 and 613. In some embodiments, the UEs access the BS (e.g., the network) using a communication link to the network (sometimes called uplink direction, as depicted by dashed arrows 631, 632, 633) , which then enables subsequent communication (e.g., shown in the direction from the network to the UEs, sometimes called downlink direction, shown by arrows 641, 642, 643) from the BS to the UEs. In some embodiments, the BS send information to the UEs (sometimes called downlink direction, as depicted by arrows 641, 642, 643) , which then enables subsequent communication (e.g., shown in the direction from the UEs to the BS, sometimes called uplink direction, shown by dashed arrows 631, 632, 633) from the UEs to the BS. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, an Internet of Things (IoT) device, and so on.
[0113] In this document the term “exemplary” is used to mean “an example of” and, unless otherwise stated, does not imply an ideal or a preferred embodiment.
[0114] Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0115] Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and / or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and / or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and / or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0116] While this document contains many specifics, these should not be construed as limitations on the scope of an invention that is claimed or of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features that are described in this document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination. Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.
[0117] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this disclosure.
Claims
1.A wireless communication method, comprising:receiving, by a communication device, a configuration for a wake-up signal (WUS) ,wherein the configuration indicates a monitoring occasion of a control channel that is to be received from a network device;transmitting the WUS to the network device; andmonitoring, by the communication device, the control channel in response to transmitting the WUS.2.The method of claim 1, wherein the monitoring occasion of the control channel is determined by at least one of a time window, a reference point, a number of monitoring occasions of the control channel, a periodicity of the system information block, or a number of times that the system information block is transmitted.3.The method of claim 2, wherein a start of the time window is a first subframe of a system frame number (SFN) , wherein SFN modulo T = N1, wherein T is the periodicity of the system information block, wherein N1 is a predetermined integer.4.The method of claim 2, wherein a start of the time window is a subframe or a slot in a radio frame for which a system frame number (SFN) modulus T = N1, where T is the periodicity of the system information block, wherein N1 is a predetermined integer.5.The method of claim 2,wherein the time window starts at an offset from the reference point, andwherein the communication device monitors the control channel thorough which a system information block is received by the communication device from a first occasion in which the control channel is to be received in the time window.6.The method of claim 5, wherein a subframe or a slot when the communication device transmits the WUS is the reference point.7.The method of claim 5, wherein the offset is indicated in the configuration or is pre-configured.8.The method of claim 2,wherein the time window starts at the reference point,wherein an occasion where the control channel is to be received is after the reference point, andwherein the occasion is configured by one or more information elements in a master information block (MIB) or another system information block received by the communication device.9.The method of claim 2, wherein a start of the time window is aligned with an occasion where the control channel is to be received for scheduling the system information block.10.The method of claim 9,wherein a time slot at a first cell is aligned with another time slot at a network energy savings cell, andwherein the occasion is configured by the network energy saving cell.11.The method of claim 9,wherein a time slot at a first cell is one time offset away from another time slot at a network energy savings cell,wherein the start of the time window is one time offset away relative to the occasion where the control channel is to be received, andwherein the time offset is pre-determined.12.The method of claim 2,wherein a random access response (RAR) message is received by the communication device in response to the transmitting the WUS, andwherein the RAR message indicates the monitoring occasion of the control channel to be received from the network device.13.The method of claim 12,wherein the RAR message indicates one or more time domain resources of the time window, andwherein the one or more time domain resources includes a start and / or a duration of the time window.14.The method of claim 2,wherein the WUS is transmitted until a number of repetitions is reached,wherein the monitoring occasion of the control channel starts at the reference point, andwherein the reference point is a first occasion when the WUS is transmitted until the number of repetitions is reached, or the reference point is a last occasion when the WUS is transmitted when the number of repetitions is reached.15.The method of claim 2, further comprising:receiving, by the communication device, a random access response (RAR) message in response to transmitting the WUS;retransmitting the WUS;monitoring, by the communication device in response to retransmitting the WUS, the monitoring occasion in which another control channel is to be received; andmonitoring another RAR message.16.The method of claim 1,wherein the configuration includes a length of a time window in which the control channel is to be received from the network device,wherein the communication device receives the control channel and a system information block within the length of the time window,wherein the system information block is associated with a single periodicity and is received once, or the system information block is associated with multiple periodicity and is received multiple times, andwherein each system information block is scheduled by the control channel received by the communication device within the time window.17.The method of claim 16, wherein the length of the time window is based on the single periodicity or the multiple periodicity of the system information block.18.The method of claim 16, wherein the length of the time window is based on a periodicity of the control channel configured in the another configuration received from the network device.19.The method of claim 16,wherein the another configuration includes a unit of time associated with the time window, andwherein the unit of time is one millisecond, one minute, or one slot.20.The method of claim 16, wherein the length of the time window is received in a random access channel response (RAR) message.21.The method of claim 16, wherein a timer starts at an end of the time window, and wherein the communication device does not monitor an occasion for another control channel for scheduling another system information block until the timer expires.22.The method of claim 16,wherein the another configuration comprises multiple window lengths is configured,wherein the multiple window lengths comprises the length of the time window in which the control channel is received, andwherein in response to the communication device receiving a random access response (RAR) message, the communication device adopts a first window length to monitor the control channel scrambled by a system information radio network temporary identifier (SI-RNTI) , andwherein in response to the communication device receiving the control channel scrambled with the SI-RNTI, the communication device adopts a second window length for subsequent control channel monitoring for scheduling subsequent system information block.23.The method of any one of claims 1 to 22, wherein the control channel includes a physical downlink control channel (PDCCH) .24.A wireless communication method, comprising:transmitting, by a network device to a communication device, a configuration for a wake-up signal (WUS) ,wherein the configuration indicates a monitoring occasion of a control channel that is to be transmitted from a network device;receiving, by the network device, the WUS; andtransmitting, by the network device, the control channel in response to receiving the WUS.25.The method of claim 24, wherein the monitoring occasion of the control channel is determined by at least one of a time window, a reference point, a number of monitoring occasions of the control channel, a periodicity of the system information block, or a number of times that the system information block is transmitted.26.The method of claim 25, wherein a first monitoring occasion is at a first subframe of a system frame number (SFN) , wherein SFN modulo T = N1, wherein T is the periodicity of the system information block, wherein N1 is a predetermined integer.27.The method of claim 25, wherein a first monitoring occasion is at a subframe or a slot in a radio frame for which a system frame number (SFN) modulus T = N1, where T is the periodicity of the system information block, wherein N1 is a predetermined integer.28.The method of claim 25, wherein the monitoring occasion starts at an offset from the reference point.29.The method of claim 28, wherein the offset is indicated in the configuration or is pre-configured.30.The method of claim 25,wherein the time window starts at the reference point,wherein an occasion where the control channel is to be received by the communication device is after the reference point, andwherein the occasion is configured by one or more information elements in a master information block (MIB) or another system information block transmitted by the network device to the communication device.31.The method of claim 25, wherein a start of the time window is aligned with an occasion where the control channel is to be received for scheduling the system information block.32.The method of claim 31,wherein a time slot at a first cell is aligned with another time slot at a network energy savings cell, andwherein the occasion is configured by the network energy saving cell.33.The method of claim 31,wherein a time slot at a first cell is one time offset away from another time slot at a network energy savings cell,wherein the start of the time window is one time offset away relative to the occasion where the control channel is to be received, andwherein the time offset is pre-determined.34.The method of claim 25,wherein a random access response (RAR) message is transmitted by the network device in response to the receiving the WUS, andwherein the RAR message indicates the monitoring occasion of the control channel to be transmitted by the network device.35.The method of claim 34,wherein the RAR message indicates one or more time domain resources of the time window, andwherein the one or more time domain resources includes a start and / or a duration of the time window.36.The method of claim 25,wherein the WUS is received until a number of repetitions is reached,wherein the monitoring occasion of the control channel starts at the reference point, andwherein the reference point is a first occasion when the WUS is transmitted by the communication device until the number of repetitions is reached, or the reference point is a last occasion when the WUS is transmitted by the communication device when the number of repetitions is reached.37.The method of claim 25, further comprising:transmitting, by the network device, a random access response (RAR) message in response to receiving the WUS;receiving another WUS;transmitting, by the network device in response to receiving the another WUS, another control channel; andtransmitting another RAR message.38.The method of claim 24,wherein the configuration includes a length of a time window,wherein the network device transmits the control channel and a system information block to be received by the communication device within the length of the time window,wherein the system information block is associated with a single periodicity and is transmitted once, or the system information block is associated with multiple periodicity and is transmitted multiple times, andwherein each system information block is scheduled by the control channel to be received by the communication device within the time window.39.The method of claim 38, wherein the length of the time window is based on the single periodicity or the multiple periodicity of the system information block.40.The method of claim 38, wherein the length of the time window is based on a periodicity of the control channel configured in the another configuration transmitted by the network device.41.The method of claim 38,wherein the another configuration includes a unit of time associated with the time window, andwherein the unit of time is one millisecond, one minute, or one slot.42.The method of claim 38, wherein the length of the time window is transmitted in a random access channel response (RAR) message.43.The method of claim 38,wherein the another configuration comprises multiple window lengths is configured,wherein the multiple window lengths comprises the length of the time window in which the control channel is to be received by the communication device, andwherein in response to the network device transmitting a random access response (RAR) message, the network device transmits the control channel scrambled by a system information radio network temporary identifier (SI-RNTI) .44.The method of any one of claims 24 to 43, wherein the control channel includes a physical downlink control channel (PDCCH) .45.An apparatus for wireless communication comprising one or more processors, configured to cause the apparatus to implement a method recited in one or more of claims 1 to 44.46.A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by one or more processors, causing the apparatus to implement a method recited in one or more of claims 1 to 44.
Citation Information
Patent Citations
Techniques and apparatuses for control channel monitoring using a wakeup signal
CN110383901A
Wake-up signal (WUS) and wake-up receiver (WUR) in a communication device
CN110622579A
Method and apparatus for monitoring physical downlink control channel in wireless communication system
CN114145050A
Method for monitoring physical downlink control channel of terminal in wireless communication system and apparatus using same
CN114208303A
Method for monitoring control channel, and device using method
WO2021020840A1