WO2022077226A1 - Discontinuous reception in sidelink communication - Google Patents

Discontinuous reception in sidelink communication Download PDF

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Publication number
WO2022077226A1
WO2022077226A1 PCT/CN2020/120667 CN2020120667W WO2022077226A1 WO 2022077226 A1 WO2022077226 A1 WO 2022077226A1 CN 2020120667 W CN2020120667 W CN 2020120667W WO 2022077226 A1 WO2022077226 A1 WO 2022077226A1
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WO
WIPO (PCT)
Prior art keywords
resources
sidelink
group
sidelink signal
transmission
Prior art date
Application number
PCT/CN2020/120667
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English (en)
French (fr)
Inventor
Yong Liu
Dong Li
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.)
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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 CN202080106158.0A priority Critical patent/CN116326181A/zh
Priority to PCT/CN2020/120667 priority patent/WO2022077226A1/en
Publication of WO2022077226A1 publication Critical patent/WO2022077226A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, apparatus and computer readable storage media of discontinuous reception (DRX) mechanism.
  • DRX discontinuous reception
  • V2X communications in the fifth generation New Radio (NR) network there are two modes of resource allocation.
  • a first mode also referred to as NR V2X mode 1 or mode 1 hereinafter
  • one terminal device e.g., a user equipment
  • a second mode also referred to as NR V2X mode 2 or mode 2 hereinafter
  • one terminal device may perform V2X communications with the other terminal device by using resources autonomously selected in a resource pool by the one terminal device.
  • V2X communications and device to device (D2D) communications can be performed based on sidelink communication technologies. For this end, sidelink resource pools and sidelink channels can be established for vehicles participating in such communications.
  • the terminal device is usually sensitive to energy consumption, and thus a power saving mechanism may be particularly desired.
  • the DRX scheme can work as an efficient power saving mechanism. For example, in sidelink communication, instead of listening or monitoring the Physical Sidelink Control Channel (PSCCH) all the time, the terminal device wakes up periodically and performs blind decoding on PSCCH in an ON duration for monitoring the PSCCH. Since the ON duration typically includes a plurality of slots, performing blind decoding on PSCCH is not energy efficient. In this situation, the feasibility and flexibility of the resource selection for DRX scheme are also poor.
  • PSCCH Physical Sidelink Control Channel
  • example embodiments of the present disclosure provide a solution of DRX scheme in sidelink communication.
  • a first apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the first apparatus at least to: determine a first group of resources for transmission of a first sidelink signal to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and transmit, to the second apparatus in an active mode, a first message indicating the first group of the resources, to cause the second apparatus to detect the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • a second apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the second apparatus at least to: receive, from a first apparatus and in an active mode, a first message comprising a first group of the resources for transmission of a first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and detect the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • a third apparatus comprises at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the third apparatus at least to: determine a resource allocation scheme indicating candidate resources for transmission of a first sidelink signal from a first apparatus to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and transmit the resource allocation scheme to the first apparatus and the second apparatus.
  • a method comprises: determining, at a first apparatus, a first group of resources for transmission of a first sidelink signal to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and transmitting, to the second apparatus in an active mode, a first message indicating the first group of the resources, to cause the second apparatus to detect the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • a method comprises: receiving, at a second apparatus in an active mode and from a first apparatus, a first message indicating a first group of the resources for transmission of a first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and detecting the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • a method comprises: determining, at a third apparatus, a resource allocation scheme indicating candidate resources for transmission of a first sidelink signal from a first apparatus to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and transmitting the resource allocation scheme to the first apparatus and the second apparatus.
  • a first apparatus comprises: means for determining, at the first apparatus, a first group of resources for transmission of a first sidelink signal to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and means for transmitting, to the second apparatus in an active mode, a first message indicating the first group of the resources, to cause the second apparatus to detect the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • a second apparatus comprises: means for receiving, at the second apparatus in an active mode and from a first apparatus, a first message indicating a first group of the resources for transmission of a first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and means for detecting the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • a third apparatus comprises: means for means for determining, at the third apparatus, a resource allocation scheme indicating candidate resources for transmission of a first sidelink signal from a first apparatus to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and means for transmitting the resource allocation scheme to the first apparatus and the second apparatus.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fourth aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fifth aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the sixth aspect.
  • Fig. 1 shows an example environment in which example embodiments of the present disclosure can be implemented
  • Fig. 2 shows an example slot format of sidelink channel between a transmitter terminal device and a receiver terminal device according to some example embodiments of the present disclosure
  • Fig. 3 shows a signaling chart illustrating a process of DRX in sidelink communication according to some example embodiments of the present disclosure
  • Fig. 4 shows an example configuration of DRX procedure according to some example embodiments of the present disclosure
  • Fig. 5A shows another configuration of DRX procedure according to some example embodiments of the present disclosure
  • Fig. 5B shows still another configuration of DRX procedure according to some example embodiments of the present disclosure
  • Fig. 6 shows a flowchart of an example method for DRX procedure according to some example embodiments of the present disclosure
  • Fig. 7 shows a flowchart of an example method for DRX procedure according to some example embodiments of the present disclosure
  • Fig. 8 shows a flowchart of an example method for DRX procedure according to some example embodiments of the present disclosure
  • Fig. 9 shows a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • Fig. 10 shows a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an example embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • circuitry may refer to one or more or all of the following:
  • 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.
  • the term “communication network” refers to a network following any suitable communication standards, such as fifth generation (5G) systems, Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on.
  • 5G fifth generation
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • the communications between a terminal device and a network device in the 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) new radio (NR) 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) new radio (NR) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR Next Generation NodeB (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, depending on the applied terminology and technology.
  • the network device is allowed to be defined as part of a gNB such as for example in CU/DU split in which case the network device is defined to be either a gNB-CU or a gNB-DU.
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • the terminal device may also correspond to Mobile Termination (MT) part of the integrated access and backhaul (IAB) node (a.k.a. a relay node) .
  • MT Mobile Termination
  • IAB integrated access and backhaul
  • the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
  • a user equipment apparatus such as a cell phone or tablet computer or laptop computer or desktop computer or mobile IoT device or fixed IoT device
  • This user equipment apparatus can, for example, be furnished with corresponding capabilities as described in connection with the fixed and/or the wireless network node (s) , as appropriate.
  • the user equipment apparatus may be the user equipment and/or or a control device, such as a chipset or processor, configured to control the user equipment when installed therein. Examples of such functionalities include the bootstrapping server function and/or the home subscriber server, which may be implemented in the user equipment apparatus by providing the user equipment apparatus with software configured to cause the user equipment apparatus to perform from the point of view of these functions/nodes.
  • the terminal device can operate in a DRX mode in which the terminal device periodically goes through an active state and an inactive state in DRX cycles.
  • a DRX cycle includes an opportunity for DRX and the ON duration of DRX.
  • the terminal device operates in the inactive state and refrains from listening or monitoring the channel, such as, the PSCCH for NR sidelink.
  • the ON duration the terminal device operates in the active state and monitors data transmissions from other terminal devices or network devices.
  • the ON duration of DRX typically includes a plurality of slots in case of no suitable resource for use by the terminal device that acts as a transmitter (also referred to the transmitter terminal device hereinafter) , however, the periodic occurrences of ON durations may not be efficient in terms of power consumption.
  • a sidelink wake-up signal similar to the WUS at Uu interface may be configured to wake up a terminal device that acts as the receiver (also referred to the receiver terminal device hereinafter) .
  • the sidelink wake-up signal is transmitted before the ON duration for monitoring the PSCCH.
  • the receiver terminal device may periodically detect the sidelink wake-up signal with relatively low energy consumption, instead of periodically going through the active state and the inactive state in DRX cycles. If the sidelink wake-up signal is detected successfully, the receiver terminal device is aware that potential control/data transmissions may be transmitted on the PSCCH and Physical Sidelink Share Channel (PSSCH) , and then begins to monitor the corresponding sidelink channel in the following ON duration.
  • PSSCH Physical Sidelink Share Channel
  • the terminal device may remain in the inactive state rather than monitoring the PSCCH.
  • the resources e.g., time/frequency/code resources
  • the resources for the sidelink wake-up signal may be assigned or coordinated by the network device, for example, a gNB. Such a scheme may be particularly suitable for the mode 1 sidelink communication.
  • the Physical Sidelink Feedback Channel (PSFCH) for sidelink communication is specified to carry the Hybrid Automatic Repeat request (HARQ) feedback over the sidelink at the physical layer.
  • a Zadoff-Chu sequence may be transmitted in one physical resource block (PRB) repeated over two OFDM symbols on the PSFCH, the first symbol of which can be used for automatic gain control (AGC) , near the end of the sidelink resource in a slot.
  • DRX signals may be configured to occupy the same location in a slot as PSFCH and employ a Zadoff-Chu sequence which, for example, may be same as or different from the Zadoff-Chu sequence transmitted on the PSFCH. This will reduce standardization effort and thus facilitate advocating the above scheme.
  • the embodiments of the present disclosure propose an enhanced DRX scheme suitable for both mode 1 and mode 2 sidelink communications.
  • one or more sidelink signals are defined for notifying the receiver terminal device of remaining in the discontinuous reception mode and waking up for monitoring respective channels.
  • candidate resources for the sidelink signals can be preconfigured from a sidelink resource pool, for example, by the network device.
  • the transmitter terminal device can select unoccupied resources for transmission of the sidelink signals and avoid resource collisions by sensing the usage of the candidate resources.
  • the resource selection manner and signaling mechanism in the proposed DRX scheme can be much more flexible and feasible for both mode 1 and mode 2 sidelink communication.
  • the proposed DRX scheme can meet the requirements and data characteristics of V2X communications, while significantly reduce the power consumption of the terminal devices.
  • Fig. 1 shows an example environment 100 in which example embodiments of the present disclosure can be implemented.
  • the communication network 100 comprises a first apparatus 110, a second apparatus 120, a third apparatus 130 and a fourth apparatus 140.
  • the first apparatus 110, the second apparatus 120 and the fourth apparatus 140 may be terminal devices and the third apparatus 130 may be the network device.
  • the third apparatus 130 may provide radio coverage for serving one or more of the first apparatus 110, the second apparatus 120 and the fourth apparatus 140, that is, a cell 102.
  • the number of network devices, terminal devices and serving cells shown in Fig. 1 is given for the purpose of illustration without suggesting any limitations.
  • the first apparatus 110, the second apparatus 120 and the fourth apparatus 140 may communicate with each other, for example, via mode 1 or mode 2 sidelink communication.
  • the first apparatus 110 is described to act as a transmitter terminal device
  • the second apparatus 120 is described to act as a receiver terminal device
  • the communication between the first apparatus 110, the second apparatus 120 and the fourth apparatus 140 is described to be mode 2 sidelink communication.
  • the example embodiments are not limited to such a specific communication scenario, but could be applied to any communication scenario including the mode 1 sidelink communication and any other suitable D2D communications.
  • the sidelink DRX signals may be transmitted from the first apparatus 110 to the second apparatus 120 for directing the DRX operations of the receiver terminal device.
  • the sidelink DRX signals may include a first sidelink signal for indicating the receiver terminal device to remain in the discontinuous reception mode.
  • the first apparatus 110 may transmit the first sidelink signal on a predetermined resource to keep the second apparatus 120 in the discontinuous reception mode.
  • the second apparatus 120 may ignore the following ON duration for monitoring the PSCCH and remain in the inactive state until the next opportunity for detection of the first sidelink signal.
  • the first sidelink signal may also facilitate other terminal devices, for example, the fourth apparatus 140 to sense the usage of the resources for the sidelink DRX signals. After sensing, the fourth apparatus 140 that intends to initiate its own DRX procedures can select unused time/frequency/code resources to transmit the sidelink DRX signals.
  • the sidelink DRX signals may additionally include a second sidelink signal for indicating the receiver terminal device to monitor data to be transmitted on the sidelink channel between the transmitter terminal device and the receiver terminal device.
  • the first apparatus 110 may transmit the second sidelink signal to the second apparatus 120.
  • the second apparatus 120 may begin to monitor control/data transmissions on the PSCCH/PSSCH. This will be described below in details.
  • the unicast communication between the first apparatus 110 and the second apparatus 120 is shown in Fig. 1, other communication modes are also applicable to the example embodiments of the present disclosure.
  • the example embodiments of the present application can involve the groupcast communication between one transmitter terminal device and a plurality of receiver terminal devices. The scope of the present disclosure is not limited to this aspect.
  • the third apparatus 130 may preconfigure candidate resources for transmission of sidelink DRX signals from the sidelink resource pool.
  • sidelink DRX signals may occupy last symbols in a slot, as illustrated in Fig. 2.
  • a sidelink DRX signal may be in the form of a Zadoff-Chu sequence and transmitted in multiple PRBs repeated over two OFDM symbols, and the first symbol of which can be used for AGC.
  • the time resources for sidelink DRX signals occur periodically, and the period may be set to be 50 ms which is suitable for VoIP traffic in public safety use case.
  • the third apparatus 130 may (pre-) configure the ON duration for monitoring the PSCCH to occur after the resource for the sidelink DRX signals, which occupies multiple slots.
  • Such a resource configuration for the sidelink DRX signals is flexibly frequency-division multiplexed and applicable for the existing specification regarding the transport block size (TBS) .
  • the network 100 may be a Code Division Multiple Access (CDMA) network, a Time Division Multiple Address (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal Frequency-Division Multiple Access (OFDMA) network, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) network or any others.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Address
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency-Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • Communications discussed in the network 100 may conform to any suitable standards including, but not limited to, New Radio Access (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , cdma2000, and Global System for Mobile Communications (GSM) and the like.
  • NR New Radio Access
  • LTE Long Term Evolution
  • LTE-A LTE-Evolution
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • the communications may be performed according to any generation of communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, 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 fifth generation (5G) communication protocols.
  • the techniques described herein may be used
  • Fig. 3 shows a signaling chart illustrating a process 300 of DRX in sidelink communication according to some example embodiments of the present disclosure.
  • the process 300 may involve the first apparatus 110, the second apparatus 120, and the third apparatus 130.
  • the first apparatus 110 determines that there is less incoming packets for transmitting to the second apparatus 120 for a certain period of time, there is no need for the second apparatus 120 to continually monitor the sidelink channel. For the purpose of power saving, the first apparatus 110 and the second apparatus 120 may expect to operate in the DRX mode.
  • a resource allocation scheme is utilized for the sidelink communication between the first apparatus 110 and the second apparatus 120.
  • the resource allocation scheme indicates at least candidate resources for transmission of the first sidelink signal.
  • the resource allocation scheme may be determined by the third apparatus 130.
  • the third apparatus 130 may determine the candidate resources and transmit 305 the resource allocation scheme indicating the candidate resources to the first apparatus 110 and the second apparatus 120.
  • the resource allocation scheme or alternatively the candidate resources may be preconfigured or predefined at the first apparatus 110 and the second apparatus 120.
  • Other terminal devices assigned with the same resource pool with the first apparatus 110 and second apparatus 120, such as, the fourth apparatus 140 may also utilize the resource allocation scheme.
  • the resource allocation scheme may further indicate a correspondence between a first group of the resources selected from the candidate resources for transmission of the first sidelink signal and a second group of the resources for transmission of the second sidelink signal.
  • the correspondence between the first and second groups of resources may be predefined or preconfigured at the first apparatus 110 and the second apparatus 120. This aspect will be described in details with connection with Figs. 4 and 5A and 5B.
  • the first apparatus 110 may determine the usage of the candidate resources before indicating the second apparatus 120 to enter the DRX mode. Now referring to Fig. 3, to determine the usage of the candidate resources, the first apparatus 110 may sense on the candidate resources in a predetermined sensing window. In this manner, the first apparatus 110 may determine, from the candidate resources, at least one unused resource and determine the first group of resources for transmission of the first sidelink signal to the second apparatus 120 from the at least one unused resource.
  • the first apparatus 110 determines 310 the first group of resources. For example, the first apparatus 110 may determine the first group of resources from the candidate resources indicated by the resource allocation scheme. The first apparatus 110 transmits 315 a first message indicative of the first group of the resources to the second apparatus 120. The first message may cause the second apparatus 120 in the DRX mode and to detect the first sidelink signal on the first group of the resources. The first sidelink signal indicates the second apparatus 120 to keep in the DRX mode. In addition, the first sidelink signal may facilitate the sensing based resource selection performed by terminal devices. Once a first sidelink signal from other terminal device, such as the fourth apparatus 140 is sensed on a particular candidate resource, the first apparatus 110 will ignore that resource and select from the rest of the candidate resources.
  • the determination of the first group of resources by the first apparatus 110 is set forth herein as example implementations and should not be regarded as suggesting any limitations on the scope of the present disclosure.
  • the first group of resources may be determined by the receiver terminal device.
  • the second apparatus 120 determines the first group of resources from the candidate resources indicated by the resource allocation scheme. After determining the first group of resources, the second apparatus 120 may inform the first apparatus 110 of the first group of resources.
  • the first group of resources may be determined jointly by the transmitter and receiver terminal devices.
  • the first apparatus 110 and the second apparatus 120 coordinate to determine the first group of resources from the candidate resources indicated by the resource allocation scheme.
  • the second apparatus 120 in the active mode may determine the first group of resources and enter 320 the DRX mode.
  • the first apparatus 110 may determine 325 that no data is to be transmitted on the sidelink channel. In this case, the first apparatus 110 transmits 330 the first sidelink signal on at least one of the resources in the first group to the second apparatus 120.
  • the second apparatus 120 detects 335 the first sidelink signal on the first group of the resources in the DRX mode. Once the first sidelink signal is successfully detected on at least one of the resources in the first group, the second apparatus 120 is aware of no data to be transmitted and remains 340 in the DRX mode until the next DRX cycle. In other words, in this case, the second apparatus 120 does not monitor the PSCCH/PSSCH and decode information transmitted on the corresponding channel during the next ON duration.
  • the first apparatus 110 may indicate the second apparatus 120 to monitor the data to be transmitted on the sidelink channel.
  • the first apparatus 110 may sense data transmissions from other terminal devices, such as, the fourth apparatus 140. It should be understood that the sensing based resource selection is given herein as example implementation and many different resource selection mechanisms can also be applied to the example embodiments of the present disclosure. The scope of the present disclosure is not limited to this aspect.
  • the first apparatus 110 may suspend 350 the transmission of the first sidelink signal on the first group of resources to indicate the second apparatus 120 to monitor the sidelink channel, which is discussed below in connection with Fig. 4.
  • Fig. 4 shows an example configuration 400 of DRX procedure according to some example embodiments of the present disclosure.
  • the resource pool includes a plurality of frequency-time resources ⁇ t i , f i ⁇ for sidelink communication, denoted as boxes in various patterns, where n is a positive integer, t i represents time resources in time domain, and f i represents frequency resources in frequency domain.
  • the boxes in the grid pattern represent the candidate resources indicated by the resource allocation scheme
  • the boxes in the stripe pattern represent the first group of resources selected from the candidate resources for transmission of the first sidelink signal.
  • the first sidelink signal is supposed to be transmitted at a certain frequency before respective ON-durations periodically, for example, at slots t’, t’+T, ...t’+ (n-1) T and so on, where T represents the period for transmission of the sidelink DRX signals.
  • T represents the period for transmission of the sidelink DRX signals.
  • the second apparatus 120 will wake up and monitor the data transmission on the sidelink channel during the next ON duration 402.
  • the second apparatus 120 may decode the PSCCHs/PSSCHs during the ON duration 402.
  • the first sidelink signal as shown in Fig. 4 occupies the same number of PRBs as a subchannel that is the minimum resource unit for the PSSCH. It should be understood that such an arrangement is given as an example implementation, and other arrangements for the first sidelink signal that occupies different number of PRBs from the subchannel is also suitable for the embodiments of the present disclosure.
  • the number of PRBs for the first sidelink signal may be configured by the third apparatus, such as, a gNB.
  • the first apparatus 110 may transmit 355, to the second apparatus 120, the second sidelink signal on the second group of resources, and the second sidelink signal is configured to indicate the second apparatus 120 to monitor data to be transmitted on the sidelink channel, which will be discussed in details in connection with Figs. 5A and 5B.
  • the terminal devices may further obtain the correspondence from the resource allocation scheme, and determine the second group of resources from the candidate resources based on the correspondence.
  • Fig. 5A shows another example configuration 510 of DRX procedure according to some example embodiments of the present disclosure.
  • the resource pool includes a plurality of frequency/time/code resources ⁇ t i , f i , c i ⁇ for sidelink communications, denoted as boxes in various patterns.
  • the boxes in the grid pattern represent the candidate resources indicated by the resource allocation scheme and the boxes in the stripe pattern represent the first group of resources ⁇ t 1 , f 1 , c 1 ⁇ selected from the candidate resources for transmission of the first sidelink signal.
  • the boxes in the dotted pattern represent the second group of resources ⁇ t 2 , f 2 , c 2 ⁇ .
  • the second group of resources can be determined as follows:
  • n is a positive integer and c 2 ⁇ c 1 .
  • the first sidelink signal and the second sidelink signal are configured to occupy the same frequency resource but different code resources.
  • the first sidelink signal and the second sidelink signal may employ the same Zadoff-Chu sequence but different cyclic shifts, and the cyclic shift employed by the second sidelink signal can be inferred from the cyclic shift employed by the first sidelink signal.
  • the second apparatus 120 successfully detects the first sidelink signal on the first group of resources before the ON duration 501, the second apparatus 120 may remain in the DRX mode and ignore the ON duration 501.
  • the second apparatus 120 since the second apparatus 120 fails to detect the first sidelink signal and successfully detects the second sidelink signal on the second group of resources before the ON duration 502, the second apparatus 120 can know that there might be potential data to be transmitted on the sidelink channel and accordingly monitor data transmitted on the sidelink channel during the ON duration 502.
  • Fig. 5B shows still another example configuration 520 of DRX procedure according to some example embodiments of the present disclosure.
  • the resource pool includes a plurality of frequency/time/code resources ⁇ t i , f i , c i ⁇ for sidelink communications, denoted as boxes in various patterns.
  • the boxes in the grid pattern represent the candidate resources indicated by the resource allocation scheme and the boxes in the stripe pattern represent the first group of resources ⁇ t 1 , f 1 , c 1 ⁇ selected from the candidate resources for transmission of the first sidelink signal.
  • the boxes in the dotted pattern represent the second group of resources ⁇ t 2 , f 2 , c 2 ⁇ .
  • the second group of resources can be determined as follows:
  • n is a positive integer
  • c 2 c 1
  • mF denotes a frequency offset
  • the second apparatus 120 successfully detects the first sidelink signal on the first group of resources before the ON duration 503, the second apparatus 120 may remain in the DRX mode and ignore the ON duration 503.
  • the second apparatus 120 since the second apparatus 120 fails to detect the first sidelink signal and successfully detects the second sidelink signal on the second group of resources before the ON duration 504, the second apparatus 120 can know that there might be potential data to be transmitted on the sidelink channel and accordingly monitor data transmitted on the sidelink channel during the ON duration 504.
  • the second apparatus 120 determines 360 that there is data transmitted on the sidelink channel, for example, denoted as the boxes in slashed pattern shown in Figs. 4, 5A and 5B.
  • the second apparatus 120 may enter the active mode and be ready to receive further data from the first apparatus 110.
  • the second apparatus 120 may transmit 365 a second message to the first apparatus 110 for indicating the second apparatus 120 is in the active mode.
  • the second message includes, but is not limited to an acknowledgement (ACK) or a negative acknowledgement (NACK) for the data transmission on the Physical Sidelink Feedback Channel (PSFCH) .
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the resources for the data transmission on the sidelink channel during the ON duration may be selected based on a sensing based resource selection performed by the first apparatus 110.
  • the first apparatus 110 may transmit 370 further data on the sidelink channel to the second apparatus 120. Otherwise, if the first apparatus 110 fails to receive the second message from the second apparatus 120, the first apparatus 110 may perform 375 the retransmission of the second sidelink signal, for example, until the second message is received from the second apparatus 120. The data transmission may then be performed 380 between the first apparatus 110 and the second apparatus 120 in, for example, a continuous reception manner.
  • the first apparatus 110 may directly transmit data on the sidelink channel during the following slots.
  • a time offset from the slot containing the second sidelink signal to a starting slot of the following ON duration can be (pre-) configured by the third apparatus 130 or preconfigured at the first apparatus 110 and the second apparatus 120.
  • the first apparatus 110 may rely on any suitable upper layer protocol to identify that the second apparatus 120 has received the second sidelink signal and enters the active mode.
  • the period of the DRX procedure including a period of time for the first apparatus 110 to transmit the sidelink DRX signals (e.g., the first sidelink signal and/or the second sidelink signal) , may be determined based on data traffic properties and latency requirements of the sidelink communication.
  • the period of the proposed DRX procedure may be negotiated between the first apparatus 110 and the second apparatus 120.
  • the period of the DRX procedure can be the same as the period of resources for the sidelink DRX signals determined by the network device or preconfigured at the terminal devices.
  • the period of the DRX procedure may be different from the period of the resources for the sidelink DRX signals.
  • the period of the DRX procedure for example, 100 ms can be multiples of the period of (pre-) configured resources for the sidelink DRX signals (e.g. 50 ms) .
  • the period for transmission of the sidelink DRX signals at the first apparatus 110 and a corresponding period for detection of the sidelink DRX signals at the second apparatus 120 may follow the period of the DRX procedure (e.g. 100 ms) , that is, transmissions and receptions of the sidelink DRX signals are performed every 100 ms.
  • the period for transmission of the sidelink DRX signals at the first apparatus 110 may follow the (pre-) configured period of the resources for the sidelink DRX signals (e.g. 50 ms) .
  • the corresponding period for detection of the sidelink DRX signals at the second apparatus 120 may also follow the period of the DRX procedure (e.g. 100 ms) .
  • the sensing for the resources occupied by sidelink DRX signals at other terminal devices, such as, the fourth apparatus 140 can be facilitated and accelerated.
  • the resource selection for the DRX procedure can be more flexible and thus the resource collisions between different terminal devices can be avoided. In this way, the power consumption of terminal devices will be significantly reduced, meanwhile the feasibility and flexibility of resource selection for DRX scheme can be improved.
  • Fig. 6 shows a flowchart of an example method 600 for DRX procedure according to some example embodiments of the present disclosure.
  • the method 600 can be implemented at a terminal device, e.g., the first apparatus 110 described with reference to Fig. 1.
  • the method 600 may further involve the second apparatus 120, the third apparatus 130 and the fourth apparatus 140.
  • the method 600 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard.
  • the first apparatus 110 determines the first group of resources for transmission of the first sidelink signal to the second apparatus 120.
  • the first sidelink signal indicates the second apparatus 120 to remain in the DRX mode.
  • the first apparatus 110 may determine the first group of resources from candidate resources indicated by a resource allocation scheme. In this case, the first apparatus 110 may receive the resource allocation scheme from the third apparatus 130. Alternatively, in other example embodiments, the resource allocation scheme indicating the candidate resources may be predefined or preconfigured at the first apparatus 110. Additionally, the terminal devices assigned with the same resource pool for sidelink communications may utilize the same resource allocation scheme for coordinating the resource selection and avoidance of collisions.
  • the first apparatus 110 may determine, from the candidate resources, at least one unused resource by sensing on the candidate resources in a sensing window. For example, the first apparatus 110 may sense the first sidelink signals transmitted by the fourth apparatus 140 on a particular candidate resource, and thereby unused candidate resources can be determined based on the sensing result. The first apparatus 110 may then determine the first group of resources from the at least one unused resource.
  • the first apparatus 110 transmits, to the second apparatus 120 in an active mode, the first message indicating the first group of the resources.
  • the receipt of the first message causes the second apparatus 120 to detect the first sidelink signal on the first group of the resources in the DRX mode.
  • the first apparatus 110 may determine whether there is data to be transmitted on the sidelink channel between the first apparatus 110 and the second apparatus 120. If the first apparatus 110 determines that no data is to be transmitted to the second apparatus 120, the first apparatus 110 may transmit, to the second apparatus 120, the first sidelink signal on at least one of the resources in the first group.
  • the first sidelink signal may be periodically transmitted to the second apparatus 120.
  • the first apparatus 110 may suspend the transmission of the first sidelink signal on the first group of resources.
  • the first apparatus 110 may transmit, to the second apparatus 120, the second sidelink signal on the second group of resources.
  • the second sidelink signal is configured to indicate the second apparatus 120 to monitor data to be transmitted on the sidelink channel.
  • the first apparatus 110 may determine, from the candidate resources for transmission of sidelink signals and based on a correspondence between the first and the second groups of the resources, the second group of the resources.
  • the sidelink signals include the first sidelink signal and the second sidelink signal
  • the second sidelink signal indicates the second apparatus 120 to monitor data to be transmitted on a sidelink channel between the first apparatus and the second apparatus.
  • the first apparatus 110 may determine the second group of the resources based on the resource allocation scheme indicating the candidate resources and the correspondence. As discussed above, the resource allocation scheme may be received from the third apparatus 130, or alternatively predefined at the first apparatus 110.
  • the second apparatus 120 Upon detection of absence of the first sidelink signal, or alternatively upon receipt of the second sidelink signal, the second apparatus 120 knows that there might be data to be transmitted on the next ON duration. In such cases, the second apparatus 120 may monitor potential control and data transmission on the PSCCH and PSSCH during the next ON duration. If the second apparatus 120 determines that data of interest is transmitted, for example, by decoding the PSCCH and PSSCH, the second apparatus 120 may transmit the second message to the first apparatus 110 for indicating that the second apparatus 120 is in the active mode and ready to receive further data from the first apparatus 110. The second message may include the ACK or the NACK for data transmission. In such embodiments, upon receipt of the second message, the first apparatus 110 may transmit, to the second apparatus 120, further data on the sidelink channel. Otherwise, if the first apparatus 110 fails to receive the second message from the second apparatus 120 for a predetermined time period, the first apparatus 110 may perform retransmission of the second sidelink signal.
  • Fig. 7 shows a flowchart of an example method 700 for DRX procedure according to some example embodiments of the present disclosure.
  • the method 700 can be implemented at a terminal device, e.g., the second apparatus 120 described with reference to Fig. 1.
  • the method 700 will be described with reference to Fig. 1.
  • the method 700 may further involve the first apparatus 110, the third apparatus 130 and the fourth apparatus 140.
  • the process 700 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard.
  • the second apparatus 120 may be in the active mode.
  • the first sidelink signal is configured to indicate the second apparatus 120 to remain in the DRX mode.
  • the second apparatus 120 Upon receipt of the first message, at 720, the second apparatus 120 detects the first sidelink signal on the first group of the resources in the DRX mode. In some example embodiments, in a case where the first sidelink signal is detected on at least one of the resources in the first group, the second apparatus 120 remains in the DRX mode. In a case where the first sidelink signal is not detected on a corresponding resource in the first group of resources, the second apparatus 120 knows that there might be data of interest to be transmitted on the sidelink channel during the next ON duration. In such cases, the second apparatus 120 monitors data transmitted on the sidelink channel for a preconfigured duration.
  • the resource allocation scheme is utilized for indicating candidate resources for transmission of sidelink DRX signals including the first sidelink signal and the second sidelink signal as well as a correspondence between the first group of resources and the second group of resources for transmission of the second sidelink signal.
  • the second sidelink signal is configured to indicate the second apparatus 120 to monitor the sidelink channel.
  • the second apparatus 120 may receive the resource allocation scheme from the third apparatus 130.
  • the resource allocation scheme may be predefined or preconfigured at the second apparatus 120.
  • the second apparatus 120 may determine, from the candidate resources and based on the correspondence, the second group of resources for transmission of the second sidelink signal. If the first sidelink signal is detected on at least one of the resources in the first group, the second apparatus 120 remains in the DRX mode. Otherwise, if the first sidelink signal is not detected on a corresponding resource in the first group of resources, the second apparatus 120 knows that there might be data of interest to be transmitted on the sidelink channel during the next ON duration. In such cases, the second apparatus 120 detects the second sidelink signal on the second group of the resources.
  • Fig. 8 shows a flowchart of an example method for DRX procedure according to some example embodiments of the present disclosure.
  • the method 800 can be implemented at a network device, e.g., the third apparatus 130 described with reference to Fig. 1.
  • the method 800 will be described with reference to Fig. 1.
  • the method 800 may further involve the first apparatus 110 and second apparatus 120.
  • the process 800 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard.
  • the third apparatus 130 determines a resource allocation scheme indicating candidate resources for transmission of a first sidelink signal from the first apparatus 110 to the second apparatus 120.
  • the first sidelink signal is configured to indicate the second apparatus 120 to remain in the DRX mode.
  • the third apparatus 130 may determine the correspondence between the first group of the resources and the second group of the resources for transmission of the second sidelink signal to the second apparatus 120.
  • the second sidelink signal is configured to indicate the second apparatus 120 to monitor the sidelink channel between the first apparatus 110 and the second apparatus 120, such as, the PSCCH or/and the PSSCH. In such embodiments, the third apparatus 130 may determine the resource allocation scheme indicating the correspondence and the candidate resources.
  • the third apparatus 130 transmits the resource allocation scheme to the first apparatus 110 and the second apparatus 120.
  • a first apparatus capable of performing the method 600 may comprise means for performing the respective steps of the method 600.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the first apparatus may be implemented as or included in the first apparatus 110.
  • the means may comprise at least one processor and at least one memory including computer program code. The at least one memory and computer program code are configured to, with the at least one processor, cause performance of the first apparatus.
  • the first apparatus comprises means for determining a first group of resources for transmission of a first sidelink signal to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and means for transmitting, to the second apparatus in an active mode, a first message indicating the first group of the resources, to cause the second apparatus to detect the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • the means for determining the first group of resources comprises means for determining the first group of resources from candidate resources for transmission of at least one sidelink signal, the at least one sidelink signal comprising the first sidelink signa.
  • the candidate resources is indicated by a resource allocation scheme received from a third apparatus or predefined at the first apparatus.
  • the means for determining the first group of resources comprises: means for determining, from the candidate resources, at least one unused resource by sensing on the candidate resources in a sensing window; and means for determining, from the at least one unused resource, the first group of resources.
  • the first apparatus further comprises means for in accordance with a determination that no data is to be transmitted on a sidelink channel between the first apparatus and the second apparatus, transmitting, to the second apparatus, the first sidelink signal on at least one of the resources in the first group.
  • the first sidelink signal is periodically transmitted to the second apparatus, and the first apparatus further comprises means for in accordance with a determination that there is data to be transmitted on a sidelink channel between the first apparatus and the second apparatus, suspending the transmission of the first sidelink signal on the first group of resources.
  • the first apparatus further comprises: means for determine, from candidate resources for transmission of sidelink signals, a second group of the resources for transmission of a second sidelink signal based on a correspondence between the first and the second groups of the resources, the sidelink signals comprising the first sidelink signal and the second sidelink signal, and the second sidelink signal indicating the second apparatus to monitor data to be transmitted on a sidelink channel between the first apparatus and the second apparatus.
  • the means for determining the second group of the resources comprises means for determining the second group of the resources based on a resource allocation scheme indicating the candidate resources and the correspondence, the resource allocation scheme being received from a third apparatus or predefined at the first apparatus.
  • the first apparatus further comprises means for in accordance with a determination that there is data to be transmitted on the sidelink channel, transmitting, to the second apparatus, the second sidelink signal on the second group of resources.
  • the first apparatus further comprises: means for in response to receiving a second message from the second apparatus, transmitting, to the second apparatus, further data on the sidelink channel, the second message comprising an acknowledgement or a negative acknowledgement for the transmission of the data; and means for in response to failing to receive the second message from the second apparatus for a predetermined time period, performing retransmission of the second sidelink signal.
  • the first apparatus is a terminal device
  • the second apparatus is a further terminal device
  • the third apparatus is a network device.
  • a second apparatus capable of performing the method 700 may comprise means for performing the respective steps of the method 700.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the means may comprise at least one processor and at least one memory including computer program code. The at least one memory and computer program code are configured to, with the at least one processor, cause performance of the second apparatus.
  • the second apparatus may be implemented as or included in the second apparatus 120.
  • the second apparatus comprises means for receiving, from a first apparatus and in an active mode, a first message indicating a first group of the resources for transmission of a first sidelink signal, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and means for detecting the first sidelink signal on the first group of the resources in the discontinuous reception mode.
  • the second apparatus further comprises: means for in accordance with a determination that the first sidelink signal is detected on at least one of the resources in the first group, remaining in the discontinuous reception mode; and means for in accordance with a determination that the first sidelink signal is not detected on a corresponding resource in the first group of resources, monitoring data transmitted on a sidelink channel between the first apparatus and the second apparatus for a preconfigured duration.
  • the second apparatus further comprises: means for determining a second group of the resources for transmission of a second sidelink signal based on a correspondence between the first and the second groups of the resources, the second sidelink signal indicating the second apparatus to monitor a sidelink channel between the first apparatus and the second apparatus.
  • the means for determining the second group of the resources comprises: means for determining the second group of the resources from candidate resources for transmission of sidelink signals from the first apparatus, the sidelink signals comprising the first sidelink signal and the second sidelink signal.
  • the candidate resources and the correspondence are indicated by a resource allocation scheme received from a third apparatus or predefined at the second apparatus.
  • the second apparatus further comprises: means for in accordance with a determination that the first sidelink signal is detected on at least one of the resources in the first group, remaining in the discontinuous reception mode; and means for in accordance with a determination that the first sidelink signal is not detected on a corresponding resource in the first group of resources, detecting the second sidelink signal on the second group of the resources.
  • the second apparatus further comprises: means for in accordance with a determination that the second sidelink signal is not detected on a corresponding resource of the second group of the resources, remaining in the discontinuous reception mode; and means for in accordance with a determination that the second sidelink signal is detected on a corresponding resource of the second group of the resources, monitoring data transmitted on a sidelink channel for a preconfigured duration.
  • the second apparatus further comprises: means for in accordance with a determination that there is no data transmitted on the sidelink channel in the preconfigured duration based on the result of monitoring, remaining in the discontinuous reception mode; and means for in accordance with a determination that there is data transmitted on the sidelink channel in the preconfigured duration based on the result of monitoring, entering the active mode.
  • the second apparatus further comprises means for in accordance with a determination that there is data transmitted on the sidelink channel, transmitting, to the first apparatus, a second message indicating the second apparatus is in the active mode, the second message comprising an acknowledgement or a negative acknowledgement for the transmission of the data.
  • the first apparatus is a terminal device
  • the second apparatus is a further terminal device
  • the third apparatus is a network device.
  • a third apparatus capable of performing the method 800 may comprise means for performing the respective steps of the method 800.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the means may comprise at least one processor and at least one memory including computer program code. The at least one memory and computer program code are configured to, with the at least one processor, cause performance of the third apparatus.
  • the third apparatus may be implemented as or included in the third apparatus 130.
  • the third apparatus comprises: means for determining candidate resources for transmission of a first sidelink signal from a first apparatus to a second apparatus, the first sidelink signal indicating the second apparatus to remain in a discontinuous reception mode; and means for transmitting, to the first apparatus and the second apparatus, a resource allocation scheme indicating the candidate resources .
  • the means for determining the resource allocation scheme comprises: means for determining a correspondence between the first group of the resources and a second group of the resources for transmission of a second sidelink signal to the second apparatus, the second sidelink signal indicating the second apparatus to monitor a sidelink channel between the first apparatus and second apparatus; and means for determining the resource allocation scheme indicating the correspondence and the candidate resources.
  • the first apparatus is a terminal device
  • the second apparatus is a further terminal device
  • the third apparatus is a network device.
  • Fig. 9 is a simplified block diagram of a device 900 that is suitable for implementing embodiments of the present disclosure.
  • the device 900 may be provided to implement the communication device, for example the first apparatus 110, the second apparatus 120, the third apparatus 130 and fourth apparatus 140 as shown in Fig. 1.
  • the device 900 includes one or more processors 910, one or more memories 920 coupled to the processor 910, and one or more communication modules 940 coupled to the processor 910.
  • the communication module 940 is for bidirectional communications.
  • the communication module 940 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 910 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 900 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 920 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 924, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 922 and other volatile memories that will not last in the power-down duration.
  • a computer program 930 includes computer executable instructions that are executed by the associated processor 910.
  • the program 930 may be stored in the ROM 920.
  • the processor 910 may perform any suitable actions and processing by loading the program 930 into the RAM 920.
  • the embodiments of the present disclosure may be implemented by means of the program 930 so that the device 900 may perform any process of the disclosure as discussed with reference to Figs. 6 to 8.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 930 may be tangibly contained in a computer readable medium which may be included in the device 900 (such as in the memory 920) or other storage devices that are accessible by the device 900.
  • the device 900 may load the program 930 from the computer readable medium to the RAM 922 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 10 shows an example of the computer readable medium 1000 in form of CD or DVD.
  • the computer readable medium has the program 930 stored thereon.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose 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. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method 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 present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out any of the methods 600 to 800 as described above with reference to Figs. 6-8.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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