Method, apparatus and system for data transmission
By transitioning to low power modes after successful data transmission through explicit indications, the method addresses inefficiencies in conventional power management, enhancing energy efficiency in data transmission systems.
Patent Information
- Application Number
- PCT/CN2024/102989
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-22
- Filing Date
- 2024-07-01
- Publication Date
- 2025-09-25
AI Technical Summary
Conventional data transmission methods fail to efficiently reduce power consumption at both the transmitter and receiver due to inefficient timing in transitioning to low power modes, particularly in scenarios where explicit ACK/NACK feedback is absent, leading to prolonged waiting times and increased power usage.
Implementing a method where the transmitter and receiver transition to low power modes after successful data transmission through explicit indications, such as RRC release commands or feedback signals, allowing flexible mode switching and reducing power consumption.
Effectively reduces power consumption by enabling timely transitions to low power modes, avoiding unnecessary active waiting periods and optimizing energy efficiency in data transmission.
Smart Images

Figure CN2024102989_25092025_PF_FP_ABST
Abstract
Description
METHOD, APPARATUS AND SYSTEM FOR DATA TRANSMISSION
[0001] This application claims the priority of U.S. Provisional Patent Application No. 63 / 568,803, filed on March 22, 2024, the disclosure of which is incorporated, in its entirety, by this reference.TECHNICAL FIELD
[0002] The present disclosure generally relates to the field of wireless communication, and in particular, to a method, apparatus and system for data transmission, and a computer readable storage medium.BACKGROUND
[0003] Hybrid automatic repeat request (HARQ) is a retransmission mechanism that combines forward error correction (FEC) and automatic repeat request. The HARQ mechanism first uses an FEC operation to decode and, if necessary, correct the received data. If the data is successfully decoded, an acknowledgment (ACK) will be sent from the receiver to the transmitter. Otherwise, a negative acknowledgment (NACK) will be sent to notify the transmitter of retransmission.
[0004] A HARQ process may further adopt a stop-and-wait protocol, which means the transmitter will not continue to send a new transmission block (TB) until it receives an ACK from the receiver for the previous TB for downlink (DL) transmission. A HARQ entity comprises multiple parallel HARQ processes, so that when a process is waiting for a response, the transmitter may use another process to send a new TB.
[0005] For uplink (UL) transmission, there is no explicit ACK / NACK feedback. If the correction fails, the receiver (i.e., the base station (BS) ) will schedule a retransmission. Otherwise, the receiver will not send any feedback.
[0006] This background information is provided to reveal information believed by the applicant to be of possible relevance to the present disclosure. No admission is necessarily intended, nor should be construed, that any of the preceding information constitutes prior art against the present disclosure.SUMMARY
[0007] This present disclosure provides a method, apparatus and system for data transmission.
[0008] According to a first aspect, a communication method is described. The method may be applied at a transmitting device, for example, a transmitting device or a module in a transmitting device, a circuit or a chip (for example, a modem (modem) chip, also referred to as a baseband (baseband) chip, or a system on chip (system on chip, SoC) chip or a system in package (system in package, SIP) chip that includes a modem core) that is responsible for a communication function in a transmitting device. For example, the method is applied to a transmitting device. The method comprises: transmitting a control signal including an indication instructing a receiving device to, after a successful reception of a data transmission, transition from a first mode to a second mode; and transmitting the data transmission.
[0009] In such case, the receiving device may enter the second mode after successful reception of a data transmission according to the control signal. Therefore, the receiving device may switch the mode in a flexible way.
[0010] In a possible design, the receiving device consumes less power in the second mode than in the first mode.
[0011] In such case, the receiving device may enter the second mode where less power may be consumed after successful reception of the data transmission. Therefore, power consumption of the receiving device may be reduced effectively.
[0012] In a possible design, the data transmission is a last data transmission of one or more data transmissions.
[0013] In such case, the receiving device may enter the second mode after the last data transmission of one or more data transmissions is received successfully. In this way, there may be no more data transmission to be received in the next certain period of time after the receiving device enters the second mode, so that the receiving device may not have to transition back to the first mode to receive other data transmissions in the next certain period of time. Therefore, power consumption of the receiving device may be reduced effectively, and frequent switch between different modes may be avoided.
[0014] In a possible design, the method further comprises: transitioning from a third mode to a fourth mode after transmitting the data transmission.
[0015] In such case, the transmitting device may switch the mode after transmitting the data transmission. In this way, the transmitting device may switch the mode in a flexible way.
[0016] In a possible design, the transmitting device consumes less power in the fourth mode than in the third mode.
[0017] In this way, power consumption of the transmitting device may be reduced effectively.
[0018] In a possible design, the method further comprises: receiving a feedback indicating the successful reception of the data transmission; and transitioning from a third mode to a fourth mode.
[0019] In such case, the transmitting device may switch the mode after receiving a feedback indicating the successful reception of the data transmission. Therefore, the transmitting device may switch the mode in a flexible way.
[0020] In a possible design, the method further comprises: receiving a second indication instructing a transmitting device to transition from a third mode to a fourth mode or indicating the successful reception of the data transmission or instructing the transmitting device to transition from the third mode to the fourth mode and indicating the successful reception of the data transmission; and transitioning from the third mode to the fourth mode.
[0021] In such case, the transmitting device may switch the mode after receiving the second indication. Therefore, the transmitting device may switch the mode in a flexible way.
[0022] In a possible design, the second indication is an RRC release command.
[0023] In this way, the method may be backward compatible.
[0024] In a possible design, the second indication is an RRC release command with suspend.
[0025] In this way, the method may be backward compatible.
[0026] In a possible design, the method further comprises: transitioning from the fourth mode to the third mode at a time instance.
[0027] In this way, the transmitting device make switch back to the third mode so that it may be ready for receiving feedback or indications from the receiving device.
[0028] In a possible design, the time instance is pre-defined.
[0029] In this way, the transmitting device make switch back to the third mode at an appropriate time. In a possible design, the data transmission includes one or more transmission blocks (TBs) .
[0030] In a possible design, the control signal further comprises an indication of resources for the data transmission.
[0031] In this way, the receiving device may know on which resources the data transmission is to be transmitted.
[0032] In a possible design, the control signal is a first control signal, the indication further indicates an identification (ID) of the data transmission, and the method further comprises: transmitting a second control signal including an indication of resources for the data transmission.
[0033] In this way, the receiving device may know which data is to be transmitted.
[0034] In a possible design, the second control signal is sent before the first control signal is sent.
[0035] In a possible design, the method further comprises: detecting absence of retransmission request for the data transmission in a period of time; and transitioning from a third mode to a fourth mode.
[0036] In such case, the transmitting device may switch the mode in a case where there are no more data transmissions to be transmitted. Therefore, the transmitting device may switch the mode in a flexible way, and power consumption of the transmitting device may be reduced.
[0037] In a possible design, wherein the indication further indicates an ID of the data transmission.
[0038] In this way, the receiving device may know which data is to be transmitted.
[0039] According to a second aspect, a communication method is described. The method may be applied at a receiving device, for example, a receiving device or a module in a receiving device, a circuit or a chip (for example, a modem (modem) chip, also referred to as a baseband (baseband) chip, or a system on chip (system on chip, SoC) chip or a system in package (system in package, SIP) chip that includes a modem core) that is responsible for a communication function in a receiving device. For example, the method is applied to a receiving device. The method comprises: receiving a control signal including an indication instructing a receiving device to, after a successful reception of a data transmission, transition from a first mode to a second mode; receiving the data transmission; and transitioning from the first mode to the second mode after the successful reception of the data transmission.
[0040] In a possible design, the receiving device consumes less power in the second mode than in the first mode.
[0041] In a possible design, the data transmission is a last data transmission of one or more data transmissions.
[0042] In a possible design, before transitioning from the first mode to the second mode, the method further comprises: transmitting a feedback indicating the successful reception of the data transmission.
[0043] In a possible design, transmitting the feedback comprises: transmitting the feedback at a time instance.
[0044] In a possible design, the time instance is pre-defined.
[0045] In a possible design, the control signal further comprises an indication of resources for the data transmission.
[0046] In a possible design, the control signal is a first control signal, the indication further indicates an ID of the data transmission and the method further comprises: receiving a second control signal including an indication of resources for the data transmission.
[0047] In a possible design, the second control signal is received before the first control signal is received.
[0048] In a possible design, before transitioning from the first mode to the second mode, the method further comprises: transmitting a second indication instructing a transmitting device to transition from a third mode to a fourth mode or indicating the successful reception of the data transmission or instructing the transmitting device to transition from the third mode to the fourth mode and indicating the successful reception of the data transmission.
[0049] In a possible design, the transmitting device consumes less power in the fourth mode than in the third mode.
[0050] In a possible design, transmitting the second indication comprises: transmitting the second indication at a time instance.
[0051] In a possible design, the time instance is pre-defined.
[0052] In a possible design, the indication further indicates an identification (ID) of the data transmission.
[0053] In a possible design, the data transmission includes one or more transmission blocks (TBs) .
[0054] According to a third aspect, a communication apparatus is described. The communication apparatus has a function of implementing the first aspect. For example, the communication apparatus includes a corresponding module, unit, or means for performing operations in the first aspect. The module, unit, or means may be specifically implemented by using software, may be implemented by using hardware, or may be implemented by using software in combination with hardware.
[0055] According to a fourth aspect, a communication apparatus is described. The communication apparatus has a function of implementing the second aspect. For example, the communication apparatus includes a corresponding module, unit, or means for performing operations in the second aspect. The module, unit, or means may be specifically implemented by using software, may be implemented by using hardware, or may be implemented by using software in combination with hardware.
[0056] According to a fifth aspect, another communication apparatus is described. The communication apparatus includes a memory and one or more processors. The memory is configured to store a part or all of a necessary computer program or instructions for implementing a function in the first aspect. The one or more processors may execute the computer program or the instructions, and when the computer program or the instructions is / are executed, the communication apparatus is enabled to implement the method in any possible design or implementation of the first aspect.
[0057] In some embodiments, the communication apparatus may further include an interface circuit, and the processor is configured to communicate with another apparatus or component through the interface circuit.
[0058] In some embodiments, the communication apparatus may further include the memory.
[0059] According to a sixth aspect, another communication apparatus is described. The communication apparatus includes a memory and one or more processors. The memory is configured to store a part or all of a necessary computer program or instructions for implementing a function in the second aspect. The one or more processors may execute the computer program or the instructions, and when the computer program or the instructions is / are executed, the communication apparatus is enabled to implement the method in any possible design or implementation of the second aspect.
[0060] In some embodiments, the communication apparatus may further include an interface circuit, and the processor is configured to communicate with another apparatus or component through the interface circuit.
[0061] In some embodiments, the communication apparatus may further include the memory.
[0062] According to a seventh aspect, a communication system is described. The system comprises: a first apparatus for implementing the method for data transmission in the first aspect or any possible implementation of the first aspect; and a second apparatus for implementing the method for data transmission in the second aspect or any possible implementation of the second aspect.
[0063] According to an eighth aspect, a computer-readable storage medium is described. The computer-readable storage medium stores computer-readable instructions, and when a computer reads and executes the computer-readable instructions, the computer is enabled to perform the method in any one of the possible designs of the first aspect to the second aspect.
[0064] According to a ninth aspect, this application provides a computer program product. When a computer reads and executes the computer program product, the computer is enabled to perform the method in any one of the possible designs of the first aspect to the second aspect.
[0065] According to a tenth aspect, this application provides a system comprising at least one of an apparatus in (or at) a UE of the present application, or an apparatus in (or at) a network device of the present application.
[0066] According to a eleventh aspect, this application provides a method performed by a system comprising at least one of an apparatus in (or at) a UE of the present application, and an apparatus in (or at) a network device of the present application.
[0067] This application encompasses various embodiments, including not only method embodiments, but also other embodiments such as apparatus embodiments and embodiments related to non-transitory computer readable storage media. Embodiments may incorporate, individually or in combinations, the features disclosed herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0068] For a better understanding of the various described embodiments, reference should be made to the Detailed Description below, in conjunction with the following drawings in which like reference numerals refer to corresponding parts throughout the figures.
[0069] FIG. 1 shows a signaling chart in conventional solutions;
[0070] FIG. 2 shows another signaling chart in conventional solutions;
[0071] FIG. 3 shows a communication system in which embodiments of the present disclosure may be implemented;
[0072] FIG. 4 shows another communication system in which embodiments of the present disclosure may be implemented;
[0073] FIG. 5 shows an apparatus that wirelessly communicates with at least one apparatus in a communication system in accordance with some embodiments of the present disclosure;
[0074] FIG. 6 shows a block diagram of an electronic device or apparatus in accordance with some embodiments of the present disclosure;
[0075] FIG. 7 shows a signaling chart in accordance with some embodiments of the present disclosure;
[0076] FIG. 8 shows another signaling chart in accordance with some embodiments of the present disclosure; and
[0077] FIG. 9 shows yet another signaling chart in accordance with some embodiments of the present disclosure.DETAILED DESCRIPTION
[0078] Numerous details are described herein to provide a thorough understanding of the example embodiments illustrated in the accompanying drawings. However, some embodiments may be practiced without many of the specific details, and the scope of the claims is only limited by those features and aspects specifically recited in the claims. Furthermore, well-known processes, components, and materials have not necessarily been described in exhaustive detail so as to avoid obscuring pertinent aspects of the embodiments described herein.
[0079] In the current technology, there are several schemes for reducing power consumption during data transmission. In order to save power, the transmitter and the receiver may go to sleep if there is no data transmission. However, in conventional solutions, both the transmitter and the receiver cannot go to sleep in time. Therefore, power of the transmitter and the receiver cannot be saved efficiently. In some examples, a transmitter or receiver may enter low power mode when there is no data transmission.
[0080] For example, when a user equipment (UE) does not perform data transmission, the UE performs a transition of a radio resource control (RRC) state for power saving. RRC statuses of the UE in the fifth generation (5G) network environment may include RRC connected state, RRC idle state and RRC inactive (deactivated) state.
[0081] The RRC connected state is a state in which an RRC connection is established between a UE and a network for data transmission.
[0082] The RRC idle state is a state in which no RRC connection is established between a UE and a network, and a base station does not store a context of the UE.
[0083] The RRC inactive (deactivated) state is a state in which a UE has entered an RRC connected state previously and then a base station releases the RRC connection, but the base station and the UE save a context. If the UE needs to enter the RRC connected state from the RRC deactivated state, an RRC connection resume process needs to be initiated. Compared with an RRC setup process, the RRC connection resume process has a shorter delay and smaller signaling overheads, but more storage overheads are occupied as the base station needs to store the context of the UE.
[0084] In an example, when the UE does not perform data transmission, the UE enters the RRC idle state or the RRC deactivated state for power saving.
[0085] However, in conventional solutions, the transmitter cannot go to sleep while waiting for the single HARQ response even if there is no data for transmission. For UL, the case is even more critical since the receiver (i.e., the BS) will not send ACK response if the TB is received correctly (i.e., successfully) . Then the transmitter (i.e., UE) has to wait for a long period before it knows the TB is received correctly and it can go to sleep.
[0086] FIG. 1 shows a diagram of DL transmission for a last TB of a data burst in conventional solutions.
[0087] In step 501, the BS transmits a last TB of a data burst to the UE. Accordingly, the UE receives the last TB. After receiving the last TB, the UE performs decoding on the last TB.
[0088] In step 502, in a case where the last TB is decoded correctly, the UE transmits, to the BS, an ACK indicating that the last TB is decoded correctly. Accordingly, the BS receives the ACK.
[0089] In step 503, the BS transmits an RRC release command to the UE. Accordingly, the UE receives the RRC release command.
[0090] In step 504, the BS goes asleep after transmitting the RRC release command.
[0091] In step 505, the UE goes asleep after receiving the RRC release command.
[0092] As described above, in conventional solutions, after receiving the last TB correctly, the UE has to wait for an RRC release (with suspend or not) command from the BS before it can sleep. This is because the UE does not know if there are more data for transmission and the BS has to maintain the UE status. In such case, the UE cannot go to sleep as soon as the complete of the data burst. In addition, the BS cannot go to sleep until it receives the ACK corresponding to the last TB.
[0093] FIG. 2 shows a diagram of UL transmission for a TB of a data burst in conventional solutions.
[0094] In step 601, the UE transmits a TB of a data burst to the BS. Accordingly, the BS receives the TB.After receiving the TB, the BS performs decoding on the TB.
[0095] Before transmitting a TB, the UE may send a UL grant request to the BS so that the BS may schedule resources for UL transmission. The UE may then transmit the TB over the resources. In a case where the last TB of the data burst has been transmitted to the BS, the UE will no longer send UL grant requests to the BS since there are no more TBs to be transmitted.
[0096] In step 602, in a case where the TB is decoded correctly and there is no UL grant requests for a certain period, the BS knows that there are no more TBs to be transmitted The BS then transmits an RRC release command to the UE. Accordingly, the UE receives the RRC release command.
[0097] In step 603, the BS goes asleep after transmitting the RRC release command.
[0098] However, after receiving the last TB correctly, the receiver BS will have to keep awake to see if there are more TBs. After waiting for a period (and finding that there is no scheduling request for a new transmission from the UE) or after receiving a request (e.g., an RRC release request) from the UE, the BS may send an RRC release (with suspend or not) command to the UE and go asleep. In some cases, before step 601, the UE may transmit, to the BS, a buffer status report (BSR) carrying information on how much data is in the UE buffer to be transmitted. However, the BSR can only provide a rough size of the data to be transmitted, so the BS cannot determine if there will be more data based on the BSR.
[0099] In step 604, the UE goes asleep after receiving the RRC release command.
[0100] For the UE, since there is no explicit ACK, it can only find the last TB is received correctly by not finding a UL grant for retransmission within a period. The UE may send an RRC release (with suspend or not) request to the BS and just keep awake. Then it can go asleep after receiving the RRC release (with suspend or not) command.
[0101] As described above, in conventional solutions, the receiver usually does not know the total transmission amount for the current data burst. In such case, the receiver may not know whether the current data burst is complete in a timely manner. Therefore, the receiver cannot go to sleep after receiving the last TB of the data burst. In other words, the receiver cannot go to sleep as soon as the data burst is complete. As a result, power of the receiver may not be saved efficiently.
[0102] As for the transmitter, it has to wait for the ACK for the last TB in DL transmission or wait for expiry of a long timer to understand the previous TB does not need a retransmission in UL transmission. In such case, the transmitter cannot go to sleep as soon as the data burst is complete. For a data burst with single TB, the waiting time for the HARQ response may take a large portion of the whole transmission. Therefore, power of the transmitter may not be saved efficiently as well.
[0103] The present disclosure provides several solutions to solve the above problems. In some aspects of the present disclosure, the transmitter transmits an indication instructing the receiver to enter the low power mode after a successful reception of a data transmission. After receiving the indication, the receiver may go asleep after receiving the data transmission successfully.
[0104] The solutions described in this disclosure are applicable to a wide range of communication networks, such as a next or future generation network, or a legacy (e.g., 5G, 4G, 3G or 2G) network. The solutions may also be implemented in WiFi, NTN, cloud and edge computing service, sensing services, or distributed or self-organized networks. In an example, the solutions may be applied to automated manufacturing systems in smart factories. In another example, the solutions may be applied to other intelligent vertical scenarios such as ports, delivery systems and medical systems.
[0105] Referring to FIG. 3, as an illustrative example without limitation, a simplified schematic illustration of a communication system according to some embodiments of the present disclosure is provided. The communication system 100 comprises a radio access network 120. The radio access network 120 may be a next or future generation radio access network, or a legacy (e.g., 5G, 4G, 3G or 2G) radio access network. One or more communication electronic devices (EDs) 110a, 110b, 110c, 110d, 110e, 110f, 110g, 110h, 110i, 110j (generically referred to as 110) may be interconnected to one another or connected to one or more network nodes 170a, 170b (generically referred to as 170) in the radio access network 120. A core network 130 may be a part of the communication system and may be dependent or independent of the radio access technology used in the communication system 100. Also the communication system 100 comprises a public switched telephone network (PSTN) 140, the internet 150, and other networks 160.
[0106] FIG. 4 illustrates an example communication system 100. In general, the communication system 100 enables multiple wireless or wired elements to communicate data and other content. The purpose of the communication system 100 may be to provide content, such as voice, data, video, and / or text, via broadcast, multicast, groupcast, unicast, etc. The communication system 100 may operate by sharing resources, such as carrier spectrum bandwidth, between its constituent elements. The communication system 100 may include a terrestrial communication system and / or a non-terrestrial communication system. The communication system 100 may provide a wide range of communication services and applications (such as earth monitoring, remote sensing, passive sensing and positioning, navigation and tracking, autonomous delivery and mobility, etc. ) . The communication system 100 may provide a high degree of availability and robustness through a joint operation of a terrestrial communication system and a non-terrestrial communication system. For example, integrating a non-terrestrial communication system (or components thereof) into a terrestrial communication system can result in what may be considered a heterogeneous network comprising multiple layers. Compared to conventional communication networks, the heterogeneous network may achieve better overall performance through efficient multi-link joint operation, more flexible functionality sharing, and faster physical layer link switching between terrestrial networks and non-terrestrial networks.
[0107] The terrestrial communication system and the non-terrestrial communication system could be considered sub-systems of the communication system. In the example shown in FIG. 4, the communication system 100 includes electronic devices (EDs) 110a, 110b, 110c, 110d (generically referred to as ED 110) , radio access networks (RANs) 120a, 120b, a non-terrestrial communication network 120c, a core network 130, a public switched telephone network (PSTN) 140, the Internet 150, and other networks 160. The RANs 120a, 120b include respective base stations (BSs) 170a, 170b, which may be generically referred to as terrestrial transmit and receive points (T-TRPs) 170a, 170b. The non-terrestrial communication network 120c includes an access node 172, which may be generically referred to as a non-terrestrial transmit and receive point (NT-TRP) 172.
[0108] Any ED 110 may be alternatively or additionally configured to interface, access, or communicate with any T-TRP 170a, 170b and NT-TRP 172, the Internet 150, the core network 130, the PSTN 140, the other networks 160, or any combination of the preceding. In some examples, ED 110a may communicate an uplink and / or downlink transmission over a terrestrial air interface 190a with T-TRP 170a. In some examples, the EDs 110a, 110b, 110c, and 110d may also communicate directly with one another via one or more sidelink air interfaces 190b. In some examples, ED 110d may communicate an uplink and / or downlink transmission over a non-terrestrial air interface 190c with NT-TRP 172.
[0109] The air interfaces 190a and 190b may use similar communication technology, such as any suitable radio access technology. For example, the communication system 100 may implement one or more channel access methods, such as code division multiple access (CDMA) , space division multiple access (SDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or single-carrier FDMA (SC-FDMA, also known as discrete Fourier transform spread OFDMA (DFT-s-OFDMA) ) in the air interfaces 190a and 190b. The air interfaces 190a and 190b may utilize other higher dimension signal spaces, which may involve a combination of orthogonal and / or non-orthogonal dimensions.
[0110] The non-terrestrial air interface 190c can enable communication between the ED 110d and one or multiple NT-TRPs 172 via a wireless link or simply a link. For some examples, the link is a dedicated connection for unicast transmission, a connection for broadcast transmission, or a connection between a group of EDs 110 and one or multiple NT-TRPs 172 for multicast transmission.
[0111] The RANs 120a and 120b are in communication with the core network 130 to provide the EDs 110a, 110b and 110c with various services such as voice, data, and other services. The RANs 120a and 120b and / or the core network 130 may be in direct or indirect communication with one or more other RANs (not shown) , which may or may not be directly served by core network 130, and may or may not employ the same radio access technology as RAN 120a, RAN 120b or both. The core network 130 may also serve as a gateway access between (i) the RANs 120a and 120b or EDs 110a, 110b and 110c or both, and (ii) other networks (such as the PSTN 140, the Internet 150, and the other networks 160) . In addition, some or all of the EDs 110a, 110b and 110c may include functionality for communicating with different wireless networks over different wireless links using different wireless technologies and / or protocols. Instead of wireless communication (or in addition thereto) , the EDs 110a, 110b and 110c may communicate via wired communication channels to a service provider or switch (not shown) , and to the Internet 150. The PSTN 140 may include circuit switched telephone networks for providing plain old telephone service (POTS) . The Internet 150 may include a network of computers and subnets (intranets) or both, and incorporate protocols, such as Internet Protocol (IP) , Transmission Control Protocol (TCP) , User Datagram Protocol (UDP) . EDs 110a, 110b and 110c may be multimode devices capable of operation according to multiple radio access technologies, and incorporate multiple transceivers necessary to support such.
[0112] FIG. 5 illustrates another example of an ED 110 and a base station 170a, 170b and / or 170c. The ED 110 is used to connect persons, objects, machines, etc. The ED 110 may be widely used in various scenarios including, for example, cellular communications, device-to-device (D2D) , vehicle to everything (V2X) , peer-to-peer (P2P) , machine-to-machine (M2M) , machine-type communications (MTC) , internet of things (IoT) , virtual reality (VR) , augmented reality (AR) , mixed reality (MR) , metaverse, digital twin, industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, drones, robots, remote sensing, passive sensing, positioning, navigation and tracking, autonomous delivery and mobility, etc.
[0113] Each ED 110 represents any suitable end user device for wireless operation and may include such devices (or may be referred to) as a user equipment / device (UE) , a wireless transmit / receive unit (WTRU) , a mobile station, a fixed or mobile subscriber unit, a cellular telephone, a station (STA) , a machine type communication (MTC) device, a personal digital assistant (PDA) , a smartphone, a laptop, a computer, a tablet, a wireless sensor, a consumer electronics device, a smart book, a vehicle, a car, a truck, a bus, a train, or an IoT device, wearable devices (such as a watch, a pair of glasses, head mounted equipment, etc. ) , an industrial device, or an apparatus in (e.g., communication module, modem, or chip) or comprising the forgoing devices, among other possibilities. Future generation EDs 110 may be referred to using other terms. The base station 170a and 170b is a T-TRP and will hereafter be referred to as T-TRP 170. Also shown in FIG. 5, a NT-TRP will hereafter be referred to as NT-TRP 172. Each ED 110 connected to T-TRP 170 and / or NT-TRP 172 can be dynamically or semi-statically turned-on (i.e., established, activated, or enabled) , turned-off (i.e., released, deactivated, or disabled) and / or configured in response to one of more of: connection availability and connection necessity.
[0114] The ED 110 includes a transmitter 201 and a receiver 203 coupled to one or more antennas 204. Only one antenna 204 is illustrated to avoid congestion in the drawing. One, some, or all of the antennas 204 may alternatively be panels. The transmitter 201 and the receiver 203 may be integrated, e.g., as a transceiver. The transceiver is configured to modulate data or other content for transmission by at least one antenna 204 or network interface controller (NIC) . The transceiver is also configured to demodulate data or other content received by the at least one antenna 204. Each transceiver includes any suitable structure for generating signals for wireless or wired transmission and / or processing signals received wirelessly or by wire. Each antenna 204 includes any suitable structure for transmitting and / or receiving wireless or wired signals.
[0115] The ED 110 includes at least one memory 208. The memory 208 stores instructions and data used, generated, or collected by the ED 110. For example, the memory 208 can store software instructions or modules configured to implement some or all of the functionality and / or embodiments described herein and that are executed by one or more processing unit (s) (e.g., a processor 210) . Each memory 208 includes any suitable volatile and / or non-volatile storage and retrieval device (s) . Any suitable type of memory may be used, such as random access memory (RAM) , read only memory (ROM) , hard disk, optical disc, subscriber identity module (SIM) card, memory stick, secure digital (SD) memory card, on- processor cache, and the like.
[0116] The ED 110 may further include one or more input / output devices (not shown) or interfaces (such as a wired interface to the Internet 150 in FIG. 3) . The input / output devices or interfaces permit interaction with a user or other devices in the network. Each input / output device or interface includes any suitable structure for providing information to or receiving information from a user, and / or for network interface communications. Suitable structures include, for example, a speaker, microphone, keypad, keyboard, display, touch screen, etc.
[0117] The ED 110 includes the processor 210 for performing operations including those operations related to preparing a transmission for uplink transmission to the NT-TRP 172 and / or the T-TRP 170; those operations related to processing downlink transmissions received from the NT-TRP 172 and / or the T-TRP 170; and those operations related to processing sidelink transmission to and from another ED 110. Processing operations related to preparing a transmission for uplink transmission may include operations such as encoding, modulating, transmit beamforming, and generating symbols for transmission. Processing operations related to processing downlink transmissions may include operations such as receive beamforming, demodulating and decoding received symbols. Depending upon the embodiment, a downlink transmission may be received by the receiver 203, possibly using receive beamforming, and the processor 210 may extract signaling from the downlink transmission (e.g., by detecting and / or decoding the signaling) . An example of signaling may be a reference signal transmitted by the NT-TRP 172 and / or by the T-TRP 170. In some embodiments, the processor 210 implements the transmit beamforming and / or the receive beamforming based on the indication of beam direction, e.g., beam angle information (BAI) , received from the T-TRP 170. In some embodiments, the processor 210 may perform operations relating to network access (e.g., initial access) and / or downlink synchronization, such as operations related to detecting a synchronization sequence, decoding and obtaining the system information, etc. In some embodiments, the processor 210 may perform channel estimation, e.g., using a reference signal received from the NT-TRP 172 and / or from the T-TRP 170.
[0118] Although not illustrated, the processor 210 may form part of the transmitter 201 and / or part of the receiver 203. Although not illustrated, the memory 208 may form part of the processor 210.
[0119] The processor 210, the processing components of the transmitter 201, and the processing components of the receiver 203 may each be implemented by the same or different one or more processors that are configured to execute instructions stored in a memory (e.g., in the memory 208) . Alternatively, some or all of the processor 210, the processing components of the transmitter 201, and the processing components of the receiver 203 may each be implemented using dedicated circuitry, such as a programmed field-programmable gate array (FPGA) , an application-specific integrated circuit (ASIC) , or a hardware accelerator such as a graphics processing unit (GPU) or an artificial intelligence (AI) accelerator.
[0120] The T-TRP 170 may be known by other names in some implementations, such as a base station (BS) , a base transceiver station (BTS) , a radio base station, a network node, a network device, a device on the network side, a transmit / receive node, a Node B, an evolved NodeB (eNodeB or eNB) , a Home eNodeB, a next Generation NodeB (gNB) , a transmission point (TP) , a site controller, an access point (AP) , a wireless router, a relay station, a terrestrial node, a terrestrial network device, a terrestrial base station, a base band unit (BBU) , a remote radio unit (RRU) , an active antenna unit (AAU) , a remote radio head (RRH) , a central unit (CU) , a distributed unit (DU) , a positioning node, among other possibilities. The T-TRP 170 may be a macro BS, a pico BS, a relay node, a donor node, or the like, or combinations thereof. The T-TRP 170 may refer to the forgoing devices or refer to apparatus (e.g., a communication module, a modem, or a chip) in the forgoing devices.
[0121] In some embodiments, the parts of the T-TRP 170 may be distributed. For example, some of the modules of the T-TRP 170 may be located remote from the equipment that houses the antennas 256 for the T-TRP 170, and may be coupled to the equipment that houses the antennas 256 over a communication link (not shown) sometimes known as front haul, such as common public radio interface (CPRI) . Therefore, in some embodiments, the term T-TRP 170 may also refer to modules on the network side that perform processing operations, such as determining the location of the ED 110, resource allocation (scheduling) , message generation, and encoding / decoding, and that are not necessarily part of the equipment that houses the antennas 256 of the T-TRP 170. The modules may also be coupled to other T-TRPs. In some embodiments, the T-TRP 170 may actually be a plurality of T-TRPs that are operating together to serve the ED 110, e.g., through the use of coordinated multipoint transmissions.
[0122] The T-TRP 170 includes at least one transmitter 252 and at least one receiver 254 coupled to one or more antennas 256. Only one antenna 256 is illustrated to avoid congestion in the drawing. One, some, or all of the antennas 256 may alternatively be panels. The transmitter 252 and the receiver 254 may be integrated as a transceiver. The T-TRP 170 further includes a processor 260 for performing operations including those related to: preparing a transmission for downlink transmission to the ED 110, processing an uplink transmission received from the ED 110, preparing a transmission for backhaul transmission to the NT-TRP 172, and processing a transmission received over backhaul from the NT- TRP 172. Processing operations related to preparing a transmission for downlink or backhaul transmission may include operations such as encoding, modulating, precoding (e.g., multiple input multiple output (MIMO) precoding) , transmit beamforming, and generating symbols for transmission. Processing operations related to processing received transmissions in the uplink or over backhaul may include operations such as receive beamforming, demodulating received symbols, and decoding received symbols. The processor 260 may also perform operations related to network access (e.g., initial access) and / or downlink synchronization, such as generating the content of synchronization signal blocks (SSBs) , generating the system information, etc. In some embodiments, the processor 260 also generates an indication of beam direction, e.g., BAI, which may be scheduled for transmission by a scheduler 253. The processor 260 performs other network-side processing operations described herein, such as determining the location of the ED 110, determining where to deploy the NT-TRP 172, etc. In some embodiments, the processor 260 may generate signaling, e.g., to configure one or more parameters of the ED 110 and / or one or more parameters of the NT-TRP 172. Any signaling generated by the processor 260 is sent by the transmitter 252. Note that “signaling” , as used herein, may alternatively be called control signaling. Signaling may be transmitted in a physical layer control channel, e.g., a physical downlink control channel (PDCCH) , in which case the signaling may be known as dynamic signaling. Signaling transmitted in a downlink physical layer control channel may be known as Downlink Control Information (DCI) . Signaling transmitted in an uplink physical layer control channel may be known as Uplink Control Information (UCI) . Signaling transmitted in a sidelink physical layer control channel may be known as Sidelink Control Information (SCI) . Signaling may be included in a higher-layer (e.g., higher than physical layer) packet transmitted in a physical layer data channel, e.g., in a physical downlink shared channel (PDSCH) , in which case the signaling may be known as higher-layer signaling, static signaling, or semi-static signaling. Higher-layer signaling may also refer to Radio Resource Control (RRC) protocol signaling or Media Access Control -Control Element (MAC-CE) signaling.
[0123] The scheduler 253 may be coupled to the processor 260. The scheduler 253 may be included within or operated separately from the T-TRP 170. The scheduler 253 may schedule uplink, downlink, sidelink, and / or backhaul transmissions, including issuing scheduling grants and / or configuring scheduling-free (e.g., “configured grant” ) resources. The T-TRP 170 further includes a memory 258 for storing information and data. The memory 258 stores instructions and data used, generated, or collected by the T-TRP 170. For example, the memory 258 could store software instructions or modules configured to implement some or all of the functionality and / or embodiments described herein and that are executed by the processor 260.
[0124] Although not illustrated, the processor 260 may form part of the transmitter 252 and / or part of the receiver 254. Also, although not illustrated, the processor 260 may implement the scheduler 253. Although not illustrated, the memory 258 may form part of the processor 260.
[0125] The processor 260, the scheduler 253, the processing components of the transmitter 252, and the processing components of the receiver 254 may each be implemented by the same or different one or more processors that are configured to execute instructions stored in a memory, e.g., in the memory 258. Alternatively, some or all of the processor 260, the scheduler 253, the processing components of the transmitter 252, and the processing components of the receiver 254 may each be implemented using dedicated circuitry, such as a programmed FPGA, a hardware accelerator (e.g., a GPU or AI accelerator) , or an ASIC.
[0126] Although the NT-TRP 172 is illustrated as a drone only as an example, the NT-TRP 172 may be implemented in any suitable non-terrestrial form, such as satellites and high altitude platforms, including international mobile telecommunication base stations and unmanned aerial vehicles, for example. Also, the NT-TRP 172 may be known by other names in some implementations, such as a non-terrestrial node, a non-terrestrial network device, or a non-terrestrial base station. The NT-TRP 172 includes a transmitter 272 and a receiver 274 coupled to one or more antennas 280. Only one antenna 280 is illustrated to avoid congestion in the drawing. One, some, or all of the antennas may alternatively be panels. The transmitter 272 and the receiver 274 may be integrated as a transceiver. The NT-TRP 172 further includes a processor 276 for performing operations including those related to: preparing a transmission for downlink transmission to the ED 110, processing an uplink transmission received from the ED 110, preparing a transmission for backhaul transmission to the T-TRP 170, and processing a transmission received over backhaul from the T-TRP 170. Processing operations related to preparing a transmission for downlink or backhaul transmission may include operations such as encoding, modulating, precoding (e.g., MIMO precoding) , transmit beamforming, and generating symbols for transmission. Processing operations related to processing received transmissions in the uplink or over backhaul may include operations such as receive beamforming, demodulating received symbols, and decoding received symbols. In some embodiments, the processor 276 implements the transmit beamforming and / or receive beamforming based on beam direction information (e.g., BAI) received from the T-TRP 170. In some embodiments, the processor 276 may generate signaling, e.g., to configure one or more parameters of the ED 110. In some embodiments, the NT-TRP 172 implements physical layer processing, but does not implement higher layer functions such as functions at the medium access control (MAC) or radio link control (RLC) layer. As this is only an example, more generally, the NT-TRP 172 may implement higher layer functions in addition to physical layer processing.
[0127] The NT-TRP 172 further includes a memory 278 for storing information and data. Although not illustrated, the processor 276 may form part of the transmitter 272 and / or part of the receiver 274. Although not illustrated, the memory 278 may form part of the processor 276.
[0128] The processor 276, the processing components of the transmitter 272, and the processing components of the receiver 274 may each be implemented by the same or different one or more processors that are configured to execute instructions stored in a memory, e.g., in the memory 278. Alternatively, some or all of the processor 276, the processing components of the transmitter 272, and the processing components of the receiver 274 may each be implemented using dedicated circuitry, such as a programmed FPGA, a hardware accelerator (e.g., a GPU or AI accelerator) , or an ASIC. In some embodiments, the NT-TRP 172 may actually be a plurality of NT-TRPs that are operating together to serve the ED 110, e.g., through coordinated multipoint transmissions.
[0129] The T-TRP 170, the NT-TRP 172, and / or the ED 110 may include other components, but these have been omitted for the sake of clarity.
[0130] One or more steps of the embodiment methods provided herein may be performed by corresponding units or modules, according to FIG. 6. FIG. 6 illustrates units or modules in a device, such as in the ED 110, in the T-TRP 170, or in the NT-TRP 172. For example, a signal may be transmitted or output by a transmitting unit or by a transmitting module. A signal may be received or input by a receiving unit or by a receiving module. A signal may be processed by a processing unit or a processing module. Other steps may be performed by an artificial intelligence (AI) or machine learning (ML) module. The respective units or modules may be implemented using hardware, one or more components or devices that execute software, or a combination thereof. For instance, one or more of the units or modules may be a circuit such as an integrated circuit. Examples of an integrated circuit include a programmed FPGA, a GPU, or an ASIC. For instance, one or more of the units or modules may be logical such as a logical function performed by a circuit, by a portion of an integrated circuit, or by software instructions executed by a processor. It will be appreciated that where the modules are implemented using software for execution by a processor for example, the modules may be retrieved by a processor, in whole or part as needed, individually or together for processing, in single or multiple instances, and that the modules themselves may include instructions for further deployment and instantiation.
[0131] While not shown, the transmitting module and the receiving module may be part of, or combined into, a transceiver module. A transceiver module may also be known as an interface module, or simply an interface, for inputting and outputting operations.
[0132] Additional details regarding the EDs 110, the T-TRP 170, and the NT-TRP 172 are known to those of skill in the art. As such, these details are omitted here.
[0133] In order to save power, the transmitter and the receiver may go to sleep as soon as the current data burst is complete.
[0134] In an aspect of the present disclosure, the transmitter may send a fast-sleep indication inside control information (i.e., DCI or UCI) . After receiving the corresponding TB correctly, the receiver may immediately go asleep.
[0135] Various embodiments of the present disclosure will be described below by way of example. The following embodiments will be illustrated by taking an example where a transmitting device or encoding device is a BS and a receiving device or decoding device is a UE. Reference is now made to FIG. 7, which shows a signaling chart for data transmission according to some embodiments of the present disclosure. The signaling chart involves the BS and the UE.
[0136] In step 701, the BS sends a control signal including an indication instructing the UE to, after a successful reception of a data transmission, transition from a first mode to a second mode. Accordingly, the UE receives the control signal.
[0137] The control signal may be transmitted via DCI, RRC or MAC Control Element (MAC-CE) signaling.
[0138] The indication may be referred to as a fast-sleep indication. In an implementation, the fast-sleep indication is a 1-bit indication. For example, bit value 1 instructs the UE to enter the low power mode after the successful reception of the data transmission. In another implementation, the fast-sleep indication is included in a control signal with a new format, and the fast-sleep indication further indicates an identification (ID) of the data transmission, such as the HARQ ID of the data transmission.
[0139] In some embodiments, the data transmission is a last data transmission in one or more data transmissions.
[0140] In an example, the one or more data transmissions may be a data burst, and the last data transmission in the one or more data transmissions may be last one or more TBs of the data burst. The last one or more TBs can be scheduled in one transmission.
[0141] In some embodiments, the UE consumes less power in the second mode than in the first mode. In an example, the second mode is a low power mode. The first mode may be a high power mode as compared to the second mode.
[0142] The low power mode may also be referred to as an energy conserved operation (ECO) mode, power save mode, or sleep mode.
[0143] In an example, the UE in the second mode may refer to that the UE is in the RRC inactive state or RRC idle state. In an example, the UE in the low power mode is in RRC inactive state, and an RRC context is reserved between the UE and the BS. When the UE in the RRC inactive state has an uplink service, the UE may directly send the uplink service in a grant-free manner. In such case, the UE in the high power mode may be in RRC connected state.
[0144] In another example, in the low power mode, some modules (e.g., an antenna unit) or some elements (e.g., a capacitor) of some modules in the UE which are turned on in the high power mode may be turned off. The UE may turn off the modules or elements by blocking power supplied to the modules or elements. In such case, compared to in the high power mode, less modules or elements are turned on in the low power mode.
[0145] In yet another example, an adjusted voltage supplied in the low power mode may have a lower level than that of a voltage normally supplied in the high power mode to partial components (e.g., a power amplifier) of the UE. An adjusted voltage supplied in the low power mode may be a voltage that enables partial components (e.g., an analog-to-digital converter) of the UE to perform only partial operations of normal operations in the high power mode.
[0146] In step 702, the BS sends the data transmission. Accordingly, the UE receives the data transmission.
[0147] As described above, the data transmission may be the last data transmission in the one or more data transmissions. For example, the last data transmission is the last one or more TBs of the data burst.
[0148] If the data burst is small or the scheduled resource is large enough, the transmission could be finished with one TB. For a more general case, there will only be one TB left for transmission / retransmission after the rest of TBs are received correctly.
[0149] In conventional solutions, after successfully receiving the last TB (i.e., TBm) of the data burst, the UE transmits an ACK indicating the successful reception of TBm. In addition, the UE has to keep awake until it receives an RRC release command. In such case, the UE cannot go to sleep directly even if the last TB of the data burst is received successfully.
[0150] According to some embodiments of the present disclosure, after deciding to transmit the last TB (i.e., TBm) of the data burst, the BS knows that the BS buffer containing the data burst will be empty. For example, the BS can check its radio link control (RLC) buffer. If the remaining data can be transmitted by one transmission, this one transmission will be the last transmission. In such case, the BS may send the control signal including the indication to the UE in step 701 which is described above. Since there are no more TBs of the data burst to be transmitted after the last TB, the UE may directly enter the low power mode after the successful reception of the last TB according to the indication.
[0151] In some implementations, there may be only one TB in the data burst, or the BS buffer can be cleared after only one schedule. In such case, the UE may enter the low power mode after the successful reception of the only one TB.
[0152] In some implementations, one scheduling is for multiple TBs. In such case, the last data transmission is the last plurality of TBs of the data burst. For example, in repetition-based transmission, one scheduling is for multiple TBs which are different versions of the same data.
[0153] In step 704, the UE transitions from the first mode to the second mode after the successful reception of the data transmission.
[0154] For example, after receiving the fast-sleep indication, the UE may know that TBm is the last TB in the data burst. In such case, the UE may enter the low power mode immediately after successfully receiving the TBm. In this way, the UE enters the low power mode as soon as the data burst is complete, thereby reducing the power consumption of the UE.
[0155] Compared to conventional solutions where the UE has to wait for an RRC release command even if the last one or more TBs are decoded correctly, in the present disclosure, the UE may enter the low power mode in a timelier manner. Therefore, the power consumption of the UE may be reduced more efficiently.
[0156] In some embodiments, after step 702 and before step 704, the UE may perform step 703.
[0157] In step 703, the UE transmits a feedback indicating the successful reception of the data transmission. Accordingly, the BS receives the feedback.
[0158] For example, after decoding the last TB correctly, the UE transmits, to the BS, an ACK indicating the successful reception of the last TB. After receiving the last TB correctly, the UE knows there is no TB in the current data burst. Then after sending the ACK, it can sleep directly.
[0159] In step 705, the BS transitions from a third mode to a fourth mode. After receiving the feedback indicating the successful reception of the data transmission in step 703, the BS may transition from the third mode to the fourth mode.
[0160] In some embodiments, the BS consumes less power in the fourth mode than in the third mode.
[0161] In an example, the fourth mode is a low power mode of the BS. The third mode may be a high power mode of the BS as compared to the fourth mode.
[0162] The low power mode may also be referred to as an energy conserved operation (ECO) mode, power save mode, or sleep mode.
[0163] In an example, in the low power mode, some modules (e.g., an antenna unit) or some elements (e.g., a capacitor) of some modules in the BS which are turned on in the high power mode may be turned off. The BS may turn off the modules or elements by blocking power supplied to the modules or elements. In such case, compared to in the high power mode, less modules or elements are turned on in the low power mode.
[0164] In another example, an adjusted voltage supplied in the low power mode may have a lower level than that of a voltage normally supplied in the high power mode to partial components (e.g., a power amplifier) of the BS. An adjusted voltage supplied in the low power mode may be a voltage that enables partial components (e.g., an analog-to-digital converter) of the BS to perform only partial operations of normal operations in the high power mode.
[0165] In an example, the BS enters the low power mode as soon as it receives the ACK from the UE. In some cases, the BS can also go asleep after receiving ACK and it may update UE status automatically.
[0166] In some embodiments, after step 702 and before step 703, the BS further performs steps 702a and 702b.
[0167] In step 702a, the BS transitions from a third mode to a fourth mode after sending the data transmission.
[0168] For example, after transmitting the last TB of the data burst, the BS may not immediately receive the feedback corresponding to the last TB. In such case, the BS may need to wait for a period of time before it receives the feedback from the UE. In order to reduce power consumption, the BS may enter the low power mode immediately after transmitting the last TB instead of keeping awake and waiting for the feedback.
[0169] In step 702b, the BS transitions from the fourth mode to the third mode at a time instance.
[0170] In an example, the BS exits the low power mode at a time instance. In such case, the BS may wake up and get ready for receiving the feedback from the UE.
[0171] In some embodiments, the time instance may be pre-defined.
[0172] For example, the HARQ timing for the last TB may be fixed or predefined so that the transmitter (e.g., the BS) may go to sleep right after sending the last TB and wake up at the predefined HARQ timing to check the result.
[0173] The time instance may be a constant, a pre-defined parameter, or in the form of time interval (s) . The time instance may be agreed between the BS and the UE or configured by other network devices, which is not limited in the present disclosure.
[0174] In some embodiments, the control signal further includes an indication of resources for the data transmission.
[0175] For example, the fast-sleep indication is carried in a control signal which also indicates the resources for the last TB. In such case, according to the fast-sleep indication, the UE may know that the TB transmitted over the resources indicated by the control signal is the last TB. The UE may directly go to sleep once the last TB is decoded successfully. The fast-sleep indication may be a one-bit indication sent through a new field in the control signal.
[0176] Alternatively, the control signal may be referred to as a first control signal, and in addition to sending the first control signal which includes the fast-sleep indication, the BS may further send a second control signal including an indication of resources for the data transmission. The first signal may be a control signal (e.g., DCI, MAC-CE, or RRC signaling) with a new format. The second control signal may be sent before the first control signal.
[0177] As described above, the fast-sleep indication may be included in a control signal with a new format, and the fast-sleep indication further indicates an ID of the data transmission. For example, the BS transmits a second control signal indicating resources for the last TB. The BS subsequently transmits a first control signal with a new format which is an example of the first control signal including the fast-sleep indication. In such case, the fast-sleep indication may indicate the ID of the last TB to be transmitted. The ID of the last TB may be HARQ ID of the last TB. After receiving the control signal with the new format, the UE may know it can enter the low power mode after a successful reception of a TB. After receiving the fast-sleep indication indicating the HARQ ID of the last TB, the UE may know it can enter the low power mode after a successful reception of which TB. In such case, the UE may enter the low power mode once it successfully receives the TB with the HARQ ID.
[0178] In some embodiments, step 701 is performed after step 702. In such case, the fast-sleep indication is sent after the data transmission. In an example, after receiving a TB with a HARQ-ID of 1 (e.g., HARQ-ID=1) , the UE further receives the fast-sleep indication indicating HARQ-ID of 1. The UE may then enter the low power mode after the successful reception of the TB with a HARQ-ID of 2 according to the fast-sleep indication.
[0179] The above embodiments are described by taking the example where the UE enters the low power mode immediately after the successful reception of the data transmission. In other embodiments, the UE may enter the low power mode after a certain period of time after the successful reception of the data transmission.
[0180] For example, in a case where certain power consumption is allowed, after the successful reception of the last TB of the data burst, the UE can wait for a certain period of time which is relatively short to detect whether there are TBs of other data bursts to be received.
[0181] If the UE does not receive TBs of other data bursts in the certain period of time, the UE may then enter the low power mode. On the other hand, the UE receives TBs of other data bursts within the certain period of time, the UE may process the TBs of other data bursts.
[0182] In some examples, the method by which the UE may process other data bursts can be referred to the method for data transmission described above.
[0183] The present disclosure provides another method for data transmission. The following embodiments will be illustrated by taking an example where the transmitting device or encoding device is a UE and the receiving device or decoding device is a BS. Reference is now made to FIG. 8, which shows a signaling chart for data transmission according to some embodiments of the present disclosure. The signaling chart involves the BS and the UE.
[0184] After receiving the last TB correctly, the receiver (i.e., BS) may update UE status and go asleep because it knows there is no TB in the current data burst. For the UE, since there is no explicit ACK, it may only know the last TB is received correctly after finding no UL grant for retransmission within a period. Then the UE may go asleep.
[0185] In step 801, the UE sends a control signal including an indication instructing the BS to, after a successful reception of a data transmission, transition from a first mode to a second mode. The indication may be referred to as a fast-sleep indication.
[0186] In some embodiments, the BS consumes less power in the second mode than in the first mode. In an example, the second mode is low power mode. The first mode may be a high power mode as compared to the second mode. As the low power mode for the BS is described above, details will not be repeated here.
[0187] The fast-sleep indication may be included in a control signal with a new format, and the fast-sleep indication further indicates an ID of the data transmission. The control signal may be transmitted via uplink control information (UCI) , RRC or MAC-CE (MAC Control Element) signaling.
[0188] In some embodiments, the data transmission is a last data transmission in one or more data transmissions.
[0189] The one or more data transmissions may be a data burst, and the last data transmission in the one or more data transmissions may be last one or more TBs of the data burst. The last one or more TBs may be scheduled in one transmission. In a case where a transmission can clear the buffer (e.g., UE RLC buffer) , the UE knows it will be the last transmission.
[0190] In an example, the BS schedules some UL resources for a TB. The UE calculates the number of bits which can be transmitted over these resources. If a TB can carry all information remaining in the buffer, the UE knows this is the last TB. In such case, the UE sends the last TB and the fast-sleep indication separately. The fast-sleep indication may further indicate an ID of the last TB such as a HARQ-ID. In this way, the BS may know that it can enter the low power mode after the successful reception of the TB with the HARQ-ID.
[0191] In step 802, the UE sends the data transmission. Accordingly, the BS receives the data transmission.
[0192] As described above, the data transmission may be the last data transmission in the one or more data transmissions. For example, the last data transmission is the last one or more TBs of the data burst.
[0193] After receiving the control signal including the indication in step 801 which is described above, the BS knows that the last TB of the data burst is to be transmitted by the UE, that is , the BS knows that it is to receive the last TB of the data burst. Since there are no more TBs of the data burst to be received after the BS receives the last TB, the BS may directly enter the low power mode after the successful reception of the last TB according to the indication.
[0194] In some implementations, there may be only one TB in the data burst, or the UE buffer can be cleared after only one schedule. In such case, the BS may enter the low power mode after the successful reception of the only one schedule.
[0195] In some embodiments, step 801 is performed after step 802. In such case, the fast-sleep indication is sent after the data transmission. In an example, after receiving a TB with a HARQ-ID of 2 (e.g., HARQ-ID=2) , the BS further receives the fast-sleep indication indicating HARQ-ID of 2. The BS may then enter the low power mode after the successful reception of the TB with a HARQ-ID of 2 according to the fast-sleep indication.
[0196] In step 803, the BS transitions from the first mode to the second mode after the successful reception of the data transmission.
[0197] For example, after receiving the fast-sleep indication, the BS may know that TBn with the HARQ-ID indicated by the fast-sleep indication is the last TB in the data burst. In such case, the BS may enter the low power mode immediately after successfully receiving TBn. In this way, the BS enters the low power mode as soon as the data burst is complete, thereby reducing the power consumption of the BS.
[0198] Compared to conventional solutions where the BS has to wait for a period to find there are no more TBs to be received, in the present disclosure, the BS may enter the low power mode in a timelier manner. Therefore, the power consumption of the BS may be reduced more efficiently.
[0199] In step 804, after detecting absence of retransmission request for the data transmission in a period of time, the UE transitions from a third mode to a fourth mode.
[0200] In a case where the BS does not receive the last TB successfully, it may transmit a retransmission request to the UE. After receiving the retransmission request, the UE may retransmit the last TB.
[0201] In a case where the BS receives the last TB successfully, it may directly enter the low power mode without explicitly inform the UE of the successful reception of the last TB. If the UE does not receive a retransmission request from the BS, it may know that the last TB has been received successfully. The UE may then enter the low power mode so as to reduce the power consumption.
[0202] In some embodiments, as shown in FIG. 9, before the BS enters the low power mode in step 803, it performs step 901.
[0203] In step 901, the BS transmits, to the UE, a second indication instructing the UE to transition from a third mode to a fourth mode or indicating the successful reception of the data transmission or instructing the transmitting device to transition from the third mode to the fourth mode and indicating the successful reception of the data transmission. Accordingly, the UE receives the second indication.
[0204] In an implementation, after receiving the last TB successfully, the BS knows there are no more TBs to be received. The BS may then transmit a second indication instructing the UE to enter the low power mode. For example, after receiving the last TB correctly, the receiver (i.e., BS) knows there is no TB in the current data burst according to the fast-sleep indication. Therefore, it may send RRC release (with suspend or not) command to UE and go asleep. For the UE, it may only know the last TB is received correctly after receiving RRC release (with suspend or not) command. Then the UE may update the HARQ and go asleep.
[0205] Alternatively, after receiving the last TB successfully, the BS may explicitly inform the UE of the result. In such case, the BS may transmit a second indication indicating the successful reception of the last TB. After receiving the second indication, the UE may know the last TB is received successfully and there are no more TBs to be transmitted. After receiving the second indication, the UE may enter the low power mode directly without waiting for retransmission request for a period of time.
[0206] In some embodiments, after step 802 and before step 804, the UE further performs steps 901a and 901b.
[0207] In step 901a, the UE transitions from a third mode to a fourth mode after sending the data transmission.
[0208] In some cases, the UE in UL transmission has to wait for a long period before it knows the last TB is received correctly. For example, after transmitting the last TB of the data burst, the UE may not immediately receive the second indication from the BS. In such case, the UE may need to wait for a period of time before it receives the second indication. In order to reduce power consumption, the UE may enter the low power mode immediately after transmitting the last TB in step 802 instead of keeping awake and waiting for the second indication.
[0209] In step 901b, the UE transitions from the fourth mode to the third mode at a time instance.
[0210] In an example, the UE exits the low power mode at a time instance. In such case, the UE may wake up and get ready for receiving the second indication from the BS.
[0211] In some embodiments, the time instance may be pre-defined. For example, time for transmitting the second indication may be fixed or predefined so that the UE may go to sleep right after sending the last TB and wake up at the predefined time to receive the second indication.
[0212] The time instance may be a constant, a pre-defined parameter, or in the form of time interval (s) . The time instance may be agreed between the BS and the UE or configured by other network devices, which is not limited in the present disclosure.
[0213] In some embodiments, the control signal may be referred to as a first control signal, and the BS further transmits another control signal (e.g., a second control signal) including an indication of resources for the data transmission. Accordingly, the UE receives the second control signal. The UE may send the first control signal in step 801 after receiving the second control signal.
[0214] For example, the UE transmits a UL grant request to the BS. The BS then transmits a DCI which is an example of the second control signal to the UE, informing the UE of resources for UL transmission. The UE transmits a fast-sleep indication to the BS subsequently and then transmit the last TB to the BS. The BS, according to the fast-sleep indication, will go to sleep directly once the last TB is successfully decoded. Alternatively, the UE may transmit the last TB before the fast-sleep indication is transmitted.
[0215] As described above, according to some embodiments of the present disclosure, the transmitter may send a fast-sleep indication before the transmission of the last TB. The fast-sleep indication may be inside DCI / UCI. After receiving the corresponding TB correctly, the receiver may immediately go asleep. In this way, power consumption of the receiver may be reduced efficiently.
[0216] For UL, the receiver (i.e., BS) may send an RRC release (with suspend or not) command to UE before going asleep so that the UE may update the HARQ process and go asleep fast. In this way, power consumption of the transmitter may be reduced efficiently.
[0217] Moreover, the HARQ timing for the last TB may be fixed so that the transmitter may go to sleep right after sending the last TB and wake up at the predefined HARQ timing to check the result. For UL, the receiver (i.e., BS) may send the RRC release command at a predefined timing and the transmitter (i.e., UE) may wake up at the predefined timing and be ready for the RRC message. In such case, the transmitter does not need to keep awake all the time while waiting for the feedback or indication from the receiver. In this way, power consumption of the transmitter may be even further reduced.
[0218] The present disclosure encompasses various embodiments, including not only method embodiments, but also other embodiments such as apparatus embodiments and embodiments related to non-transitory computer readable storage media. Embodiments may incorporate, individually or in combinations, the features disclosed herein.
[0219] Although this disclosure refers to illustrative embodiments, this is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the disclosure, will be apparent to persons skilled in the art upon reference to the description.
[0220] Features disclosed herein in the context of any particular embodiments may also or instead be implemented in other embodiments. Method embodiments, for example, may also or instead be implemented in apparatus, system, and / or computer program product embodiments. In addition, although embodiments are described primarily in the context of methods and apparatus, other implementations are also contemplated, as instructions stored on one or more non-transitory computer-readable media, for example. Such media could store programming or instructions to perform any of various methods consistent with the present disclosure.
[0221] Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) . The computer-readable storage medium has stored thereon program instructions that, when run on a network device / terminal device, cause the network device / terminal device to execute one or more steps of the method for beam management as described in any one of the above embodiments.
[0222] For example, the computer-readable storage medium includes, but is not limited to, a magnetic storage device (e.g., a hard disk, a floppy disk or a magnetic tape) , an optical disk (e.g., a compact disk (CD) , or a DVD) , a smart card, and a flash memory device (e.g., an erasable programmable read-only memory (EPROM) , a card, a stick or a key driver) . Various computer-readable storage media described in the embodiments of the present disclosure may represent one or more devices and / or other machine-readable storage media, which are used for storing information. The term "computer-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.
[0223] Some embodiments of the present disclosure further provide a computer program product. The computer program product includes program instructions carried on a non-transitory computer-readable storage medium. When executed on a network device / terminal device, the computer program instructions cause the network device / terminal device to perform one or more steps of the method for data transmission as described in the above embodiments.
[0224] Beneficial effects of the computer-readable storage medium and the computer program product are the same as the beneficial effects of the method for data transmission as described in some of the above embodiments, and details will not be repeated here.
[0225] The foregoing descriptions are merely specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or replacements within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
[0226] In some aspects of the present disclosure, there is provided a computer program comprising instructions. The instructions, when executed by a processor, may cause the processor to implement a method of the present disclosure.
[0227] In some aspects of the present disclosure, there is provided an integrated circuit. The integrated circuit includes one or more logic circuits for executing the steps of the method for data transmission of the present disclosure.
[0228] In some aspects of the present disclosure, there is provided an apparatus comprising means (e.g., at least one processor) to implement a method of the present disclosure. The apparatus may be device (that is, a terminal device or a network device) or a module or component in the device. The at least one processor may execute instructions stored in a computer-readable medium to implement the method.
[0229] The apparatus may be a communication device or an apparatus implemented in a communication device. For example, the apparatus implemented in a communication device may be an integrated circuit, which in some contexts may be known by other colloquial names, such as chip, modem, modem chip, baseband chip, or baseband processor. In some implementations, one or more integrated circuits can be packaged into a system-on-chip, a system-in-package, or a multi-chip module. The apparatus may comprise one or more integrated circuits or comprise one or more integrated circuits and other discrete components.
[0230] It will be appreciated that any module, component, or device disclosed herein that executes instructions may include, or otherwise have access to, a non-transitory computer / processor readable storage medium or media for storage of information, such as computer / processor readable instructions, data structures, program modules and / or other data. A non-exhaustive list of examples of non-transitory computer / processor readable storage media includes magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, optical disks such as compact disc read-only memory (CD-ROM) , digital video discs or digital versatile discs (i.e., DVDs) , Blu-ray DiscTM, or other optical storage, volatile and non-volatile, removable and non-removable media implemented in any method or technology, random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable read-only memory (EEPROM) , flash memory or other memory technology. Any such non-transitory computer / processor storage media may be part of a device / apparatus or accessible or connectable thereto. Computer / processor readable / executable instructions to implement a method, an application or a module described herein may be stored or otherwise held by such non-transitory computer / processor readable storage media.
[0231] It could be noted that the message in the disclosure could be replaced with information, which may be carried in one single message, or be carried in more than one separate message.
[0232] The terms “apparatus” and “device” are used exchangeable.
[0233] In the disclosure, the word “a” or “an” when used in conjunction with the term “comprising” or “including” in the claims and / or the specification may mean “one” , but it is also consistent with the meaning of “one or more” , “at least one” , and “one or more than one” unless the content clearly dictates otherwise. Similarly, the word “another” may mean at least a second or more unless the content clearly dictates otherwise.
[0234] In the disclosure, the words “first” , “second” , etc., when used before a same term (e.g., UE, or an operating step) does not mean an order or a sequence of the term. For example, the “first UE” and the “second UE” , means two different UEs without specially indicated, and similarly, the “first step” and the “second step” means two different operating steps without specially indicated, but does not mean the first step have to happen before the second step. The real order depends on the logic of the two steps.
[0235] The terms “coupled” , “coupling” or “connected” as used herein can have several different meanings depending on the context in which these terms are used. For example, as used herein, the terms coupled, coupling, or connected can indicate that two elements or devices are directly connected to one another or connected to one another through one or more intermediate elements or devices via a mechanical element depending on the particular context.
[0236] Note that the expression “at least one of A or B” , as used herein, is interchangeable with the expression “A and / or B” . It refers to a list in which you may select A or B or both A and B. Similarly, “at least one of A, B, or C” , as used herein, is interchangeable with “A and / or B and / or C” or “A, B, and / or C” . It refers to a list in which you may select: A or B or C, or both A and B, or both A and C, or both B and C, or all of A, B and C. The same principle applies for longer lists having a same format.
[0237] The present disclosure encompasses various embodiments, including not only method embodiments, but also other embodiments such as apparatus embodiments and embodiments related to non-transitory computer readable storage media. Embodiments may incorporate, individually or in combinations, the features disclosed herein.
[0238] The term “receive” , “detect” and “decode” as used herein can have several different meanings depending on the context in which these terms are used. For example, without special note, the term “receive” may indicate that information (e.g., DCI, or MAC-CE, RRC signaling or TB) is received successfully by the receiving node, which means the receiving side correctly detect and decode it. In this scenario, “receive” may cover “detect” and “decode” or may indicates same thing, e.g., “receive paging” means decoding paging correctly and obtaining the paging successfully, accordingly, “the receiving side does not receive paging” means the receiving side does not detect and / or decoding the paging. “paging is not received” means the receiving side tries to detect and / or decoding the paging, but not obtain the paging successfully. The term “receive” may sometimes indicate that a signal arrives at the receiving side, but does not mean the information in the signal is detected and decoded correctly, then the receiving side need perform detecting and decoding on the signal to obtain the information carried in the signal. In this scenario, “receive” , “detect” and “decode” may indicate different procedure at receiving side to obtain the information. Although this disclosure refers to illustrative embodiments, this is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the disclosure, will be apparent to persons skilled in the art upon reference to the description. When combining two or more embodiments, not all the features in the embodiments to be combined are necessary for the combination.
[0239] Features disclosed herein in the context of any particular embodiments may also or instead be implemented in other embodiments. Method embodiments, for example, may also or instead be implemented in apparatus, system, and / or computer program product embodiments. In addition, although embodiments are described primarily in the context of methods and apparatus, other implementations are also contemplated, as instructions stored on one or more non-transitory computer-readable media, for example. Such media could store programming or instructions to perform any of various methods consistent with the present disclosure.
[0240] The following acronyms and abbreviations may be used in the present disclosure:
Claims
1.A method for data transmission, performed at a transmitting device, the method comprising:transmitting a control signal including an indication instructing a receiving device to, after a successful reception of a data transmission, transition from a first mode to a second mode; andtransmitting the data transmission.2.The method of claim 1, wherein the receiving device consumes less power in the second mode than in the first mode.3.The method of claim 1 or claim 2, wherein the data transmission is a last data transmission of one or more data transmissions.4.The method of any one of claims 1-3, further comprising:transitioning from a third mode to a fourth mode after transmitting the data transmission.5.The method of claim 4, wherein the transmitting device consumes less power in the fourth mode than in the third mode.6.The method of any one of claims 1-3, further comprising:receiving a feedback indicating the successful reception of the data transmission; andtransitioning from a third mode to a fourth mode.7.The method of any one of claims 1-3, further comprising:receiving a second indication instructing a transmitting device to transition from a third mode to a fourth mode or indicating the successful reception of the data transmission or instructing the transmitting device to transition from the third mode to the fourth mode and indicating the successful reception of the data transmission; andtransitioning from the third mode to the fourth mode.8.The method of claim 7, wherein the second indication is an RRC release command.9.The method of claim 7, wherein the second indication is an RRC release command with suspend.10.The method of any one of claims 4-9, further comprising:transitioning from the fourth mode to the third mode at a time instance.11.The method of claim 10, wherein the time instance is pre-defined.12.The method of any one of claims 1-11, wherein the data transmission includes one or more transmission blocks (TBs) .13.The method of any one of claims 1-6, wherein the control signal further comprises an indication of resources for the data transmission.14.The method of any one of claims 1-6, wherein the control signal is a first control signal, the indication further indicates an identification (ID) of the data transmission, and the method further comprises: transmitting a second control signal including an indication of resources for the data transmission.15.The method of claim 14, wherein the second control signal is sent before the first control signal is sent.16.The method of claim 1, further comprising:detecting absence of retransmission request for the data transmission in a period of time; andtransitioning from a third mode to a fourth mode.17.The method of any one of claims 1-16, wherein the indication further indicates an ID of the data transmission.18.A method for data transmission, performed at a receiving device, the method comprising:receiving a control signal including an indication instructing a receiving device to, after a successful reception of a data transmission, transition from a first mode to a second mode;receiving the data transmission; andtransitioning from the first mode to the second mode after the successful reception of the data transmission.19.The method of claim 18, wherein the receiving device consumes less power in the second mode than in the first mode.20.The method of claim 18 or claim 19, wherein the data transmission is a last data transmission of one or more data transmissions.21.The method of any one of claims 18-20, wherein before transitioning from the first mode to the second mode, the method further comprises:transmitting a feedback indicating the successful reception of the data transmission.22.The method of claim 21, wherein transmitting the feedback comprises:transmitting the feedback at a time instance.23.The method of claim 22, wherein the time instance is pre-defined.24.The method of any one of claims 18-23, wherein the control signal further comprises an indication of resources for the data transmission.25.The method of any one of claims 18-23, wherein the control signal is a first control signal, the indication further indicates an ID of the data transmission and the method further comprises: receiving a second control signal including an indication of resources for the data transmission.26.The method of claim 25, wherein the second control signal is received before the first control signal is received.27.The method of any one of claims 18-20, wherein before transitioning from the first mode to the second mode, the method further comprises:transmitting a second indication instructing a transmitting device to transition from a third mode to a fourth mode or indicating the successful reception of the data transmission or instructing the transmitting device to transition from the third mode to the fourth mode and indicating the successful reception of the data transmission.28.The method of claim 27, wherein the transmitting device consumes less power in the fourth mode than in the third mode.29.The method of claim 27 or claim 28, wherein transmitting the second indication comprises:transmitting the second indication at a time instance.30.The method of claim 29, wherein the time instance is pre-defined.31.The method of any one of claims 27-30, wherein the indication further indicates an identification (ID) of the data transmission.32.The method of any one of claims 18-31, wherein the data transmission includes one or more transmission blocks (TBs) .33.An apparatus, comprising a processor configured to cause the apparatus to perform the method of any one of claims 1 to 32.34.A computer-readable storage medium having stored thereon computer program instructions that, when executed by a processing circuit of a computer, cause the computer to implement the method of any one of claims 1 to 32.35.A computer program product having instructions that, when executed by a computer, cause the computer to implement the method of any one of claims 1 to 32.36.A system comprising: a first apparatus for implementing the method of any one of claims 1 to 17; anda second apparatus for implementing the method of any one of claims 18 to 32.