A small data packet transmission method, device and computer readable storage medium

Abstract

Embodiments of the present application provide a small data packet transmission method, device and computer readable storage medium, the method comprising: a fixed position terminal sends a first message, the first message carries first indication information; wherein the first indication information is used to indicate that the terminal expects to save the last used uplink timing advance (TA) and downlink beam when entering an inactivated state.

Description

Technical Field

[0001] This invention relates to the field of mobile communication technology, and in particular to a method, apparatus and computer-readable storage medium for transmitting small data packets. Background Technology

[0002] Rel-17 introduced Small Data Transmission (SDT), a technique for transmitting small data packets in the RRC_INACTIVE state. SDT primarily addresses uplink transmission and does not cover downlink transmission.

[0003] Currently, when a terminal is in the RRC_INACTIVE state, if downlink data arrives from the core network and needs to be transmitted, a paging request will be initiated by the core network or the RAN side. After receiving the paging request, the terminal will first restore the RRC connection through the RRC connection recovery procedure (entering the RRC_CONNECTED state) before proceeding with downlink data transmission. For small data packet transmission, this results in unnecessary power consumption and signaling overhead, and generates significant latency. Summary of the Invention

[0004] In view of this, embodiments of the present invention aim to provide a method, apparatus, and computer-readable storage medium for transmitting small data packets.

[0005] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0006] This invention provides a small data packet transmission method, which is applied to a terminal with a fixed location, and includes:

[0007] Send a first message, the first message carrying first indication information; wherein,

[0008] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state.

[0009] Optionally, after sending the first message, the method further includes:

[0010] A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state;

[0011] Save the downlink beam and the most recent uplink TA.

[0012] Optionally, the method further includes:

[0013] Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources;

[0014] The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

[0015] Optionally, after receiving the third message, the method further includes:

[0016] The reference signal received power (RSRP) value corresponding to the downlink beam is judged based on a threshold. If the RSRP value is greater than or equal to the threshold, the downlink beam is used to receive downlink small data packets.

[0017] If the RSRP value is less than the threshold, a random access procedure is initiated to re-establish a beam pair with the base station and update the uplink TA; the downlink beam in the newly established beam pair used in the inactive state is received by the base station through the second indication information.

[0018] The second indication information is further used to indicate the physical uplink control channel (PUCCH) resources used by the terminal in the inactive state for downlink hybrid automatic repeat request (HARQ) feedback.

[0019] Optionally, after receiving the downlink small data packet, the method further includes:

[0020] The PUCCH resource is used to perform HARQ feedback on the transmission of downlink small data packets.

[0021] This invention also provides a small data packet transmission method, which is applied to a base station and includes:

[0022] Receive a first message, the first message carrying first indication information; wherein,

[0023] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed.

[0024] After receiving the first message, the method further includes:

[0025] Send a second message, which instructs the terminal to enter an inactive state;

[0026] The second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state.

[0027] Optionally, the method further includes:

[0028] A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

[0029] Optionally, after sending the second message, the method further includes:

[0030] Small data packets are transmitted on the downlink SPS resources of the downlink beam.

[0031] Optionally, after sending the third message, the method further includes:

[0032] Responding to a random access request initiated by the terminal; the random access request is initiated by the terminal when it determines that the RSRP value corresponding to the downlink beam is less than a threshold;

[0033] The beam pair is re-established with the terminal through a random access procedure, and the uplink TA is updated.

[0034] The terminal is again instructed by the second instruction information to receive downlink small data packets in the inactive state using the downlink beam of the newly established beam pair.

[0035] Wherein, the second indication information is further used to indicate the PUCCH resources used by the terminal for downlink HARQ feedback in the inactive state; correspondingly, the method further includes:

[0036] The terminal receives HARQ feedback for the transmission of downlink small data packets using the PUCCH resource.

[0037] This invention also provides a small data packet transmission device, which is applied to a fixed-location terminal and includes:

[0038] A first transceiver module is used to send a first message, the first message carrying first indication information; wherein...

[0039] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state.

[0040] This invention also provides a small data packet transmission device, which is applied to a base station and includes:

[0041] The second transceiver module is used to receive a first message, wherein the first message carries first indication information; wherein...

[0042] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed.

[0043] This invention also provides a small data packet transmission device, which includes: a processor and a memory for storing a computer program capable of running on the processor.

[0044] When the processor runs the computer program, it executes the steps of the above method.

[0045] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method.

[0046] The present invention provides a small data packet transmission method, apparatus, and computer-readable storage medium. A fixed-location terminal sends a first message carrying first indication information. This first indication information indicates that the terminal, upon entering an inactive state, wishes to retain the most recently used uplink timing advance (TA) and downlink beam. In this embodiment, the fixed-location terminal can perform small data packet transmission on downlink SPS resources using the most recently used uplink timing advance (TA) and downlink beam, eliminating the need for frequent beam pair establishment via random access procedures. This not only saves radio resources but also reduces processing complexity, enabling downlink small data packet transmission for inactive terminals. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the small data packet transmission method described in an embodiment of the present invention. Figure 1 ;

[0048] Figure 2 This is a schematic diagram of the small data packet transmission method described in an embodiment of the present invention. Figure 2 ;

[0049] Figure 3 This is a schematic diagram of the small data packet transmission device according to an embodiment of the present invention. Figure 1 ;

[0050] Figure 4 This is a schematic diagram of the small data packet transmission device according to an embodiment of the present invention. Figure 2 ;

[0051] Figure 5 This is the downlink small data packet processing flow of the terminal in the INACTIVE state as described in the embodiments of the present invention. Detailed Implementation

[0052] The present invention will now be described in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] In Rel-18, paging-triggered downlink small packet transmission (SDT) will be supported. This includes a small packet transmission triggering mechanism for RRC_INACTIVE state terminals, as well as an uplink random access SDT and configured grant SDT mechanism. The goal is to reduce signaling overhead and terminal power consumption by not transitioning to RRC_CONNECTED state, and to reduce latency by allowing fast transmission of (small and infrequent) packets.

[0054] If the network pre-configures downlink SPS resources for the RRC_INACTIVE state terminal, the network can notify the RRC_INACTIVE state terminal to receive downlink small data packets on the downlink SPS resources via Paging messages when certain conditions are met (e.g., when the data volume is below a certain threshold). However, since the INACTIVE state terminal has not established an initial beam pair, the network does not know which beam should be used to send downlink data to the terminal on the downlink SPS occasion. If beam scanning is used to send downlink SPS data, multiple SPS occasions are required, and each SPS occasion corresponds to a different beam (i.e., associated with different SSBs), which not only leads to the consumption of more radio resources but also introduces higher processing complexity. In view of this,

[0055] This invention provides a method for transmitting small data packets, such as... Figure 1 As shown, this method is applied to a terminal with a fixed location and includes:

[0056] Step 101: Send a first message, the first message carrying first indication information; wherein,

[0057] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state.

[0058] In this embodiment of the invention, the fixed-location terminal refers to a terminal whose location relative to the base station is typically fixed or changes very little, such as a smart meter or a terminal used for environmental monitoring. For such terminals, their corresponding optimal downlink beam and uplink timing advance (TA) are usually also constant. Therefore, an inactive (INACTIVE) terminal can save the most recently used downlink beam and TA, and use this downlink beam and TA to transmit small data packets (i.e., small packets) on downlink SPS resources.

[0059] In practical applications, such as Figure 5 As shown, a fixed-location terminal can report information similar to InactiveStatePreference through the UEAssistanceInformation message (first message). This information indicates whether the terminal expects to save the most recently used N_TA and SSB index (i.e., downlink beam) when entering the RRC_INACTIVE state.

[0060] In this embodiment of the invention, after sending the first message, the method further includes:

[0061] A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state;

[0062] Save the downlink beam and the most recent uplink TA.

[0063] Here, as Figure 5 As shown, if the terminal reports InactiveStatePreference information, when the gNB sends the RRCLease message (the second message) to put the terminal into INACTIVE state, it can configure the SSB index (i.e., downlink beam) to be used in RRC_INACTIVE state. After receiving the RRCLease message, the terminal will save the SSB index value and the most recent N_TA value, and consider the uplink to be synchronized.

[0064] In one embodiment of the present invention, the method further includes:

[0065] Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources;

[0066] The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

[0067] In this embodiment of the invention, if the network wants the INACTIVE state terminal to use pre-configured downlink semi-static scheduling (SPS) resources to receive small data packets, the network will pre-configure the downlink SPS resources in the RRC_INACTIVE state when instructing the terminal to enter the RRC_INACTIVE state via the RRCLease message. This downlink SPS resource specifies information such as period, time-frequency position, MCS, and HARQ. The downlink SPS resource is deactivated by default, and in the deactivated state, the terminal will not attempt to receive downlink data on this downlink SPS resource. Only after receiving an "activation" instruction (i.e., a Paging message) from the network will the terminal receive downlink data on this downlink SPS resource.

[0068] When the Paging message (third message) received by the INACTIVE state terminal instructs the terminal to receive downlink small data packets on downlink SPS resources, the terminal will use the downlink beam corresponding to the saved SSB index to receive downlink small data packets on downlink SPS resources.

[0069] In one embodiment of the present invention, after receiving the third message, the method further includes:

[0070] The reference signal received power (RSRP) value corresponding to the downlink beam is judged based on a threshold. If the RSRP value is greater than or equal to the threshold, the downlink beam is used to receive downlink small data packets.

[0071] If the RSRP value is less than the threshold, a random access procedure is initiated to re-establish a beam pair with the base station and update the uplink TA; the downlink beam in the newly established beam pair used in the inactive state is received by the base station through the second indication information.

[0072] Here, although the terminal's position is fixed, certain factors, such as obstruction by obstacles, may cause the stored downlink beam (SSB index) to become invalid. To address this issue, when the INACTIVE state terminal receives a Paging message instructing it to receive downlink small data packets on downlink SPS resources,

[0073] If the terminal finds that the RSRP corresponding to the saved SSB index is equal to or higher than a certain threshold, it will continue to use the beam corresponding to the saved SSB index to receive downlink SPS transmission.

[0074] If the terminal finds that the RSRP corresponding to the saved SSB index is lower than a certain threshold, the terminal will initiate random access, re-establish the beam pair and uplink synchronization, and update the N_TA value. After the random access is completed, if the base station wants the terminal to continue in the RRC_INACTIVE state, it will configure a new SSB index (i.e., downlink beam) to be used in the RRC_INACTIVE state in the RRC_INACTIVE state via an RRCRelease message.

[0075] In one embodiment of the present invention, the second indication information is further used to indicate the physical uplink control channel (PUCCH) resources used by the terminal in the inactive state for downlink hybrid automatic repeat request (HARQ) feedback.

[0076] In one embodiment of the present invention, after receiving downlink small data packets, the method further includes:

[0077] The PUCCH resource is used to perform HARQ feedback on the transmission of downlink small data packets.

[0078] Here, when the gNB causes the terminal to enter the INACTIVE state via the RRC_INACTIVE message, it can configure the PUCCH resources used for downlink HARQ feedback in the RRC_INACTIVE state, such as... Figure 5 As shown, this is to enable the terminal to perform HARQ feedback on downlink small data packet transmissions on SPS resources.

[0079] In one embodiment of the present invention, if the terminal does not report InactiveStatePreference information, when the gNB causes the terminal to enter the INACTIVE state via the RRC_INACTIVE message, it will not configure the SSB index (i.e., downlink beam) for use in the RRC_INACTIVE state. In this case, when the INACTIVE state terminal receives a Paging message indicating that it will receive downlink small data packets on downlink SPS resources, it needs to establish an initial beam pair before performing downlink SPS transmission.

[0080] This invention also provides a method for transmitting small data packets, such as... Figure 2 As shown, this method is applied to a base station and includes:

[0081] Step 201: Receive a first message, the first message carrying first indication information; wherein,

[0082] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed.

[0083] In one embodiment of the present invention, after receiving the first message, the method further includes:

[0084] Send a second message, which instructs the terminal to enter an inactive state;

[0085] The second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state.

[0086] In one embodiment of the present invention, the method further includes:

[0087] A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

[0088] In one embodiment of the present invention, after sending the second message, the method further includes:

[0089] Small data packets are transmitted on the downlink SPS resources of the downlink beam.

[0090] In one embodiment of the present invention, after sending the third message, the method further includes:

[0091] Responding to a random access request initiated by the terminal; the random access request is initiated by the terminal when it determines that the RSRP value corresponding to the downlink beam is less than a threshold;

[0092] The beam pair is re-established with the terminal through a random access procedure, and the uplink TA is updated.

[0093] The terminal is again instructed by the second instruction information to receive downlink small data packets in the inactive state using the downlink beam of the newly established beam pair.

[0094] In one embodiment of the present invention, the second indication information is further used to indicate the PUCCH resources used by the terminal for downlink HARQ feedback in the inactive state; correspondingly, the method further includes:

[0095] The terminal receives HARQ feedback for the transmission of downlink small data packets using the PUCCH resource.

[0096] To implement the above method embodiments, this invention also provides a small data packet transmission device, such as... Figure 3 As shown, the device is applied to a fixed-location terminal and includes:

[0097] The first transceiver module 301 is used to send a first message, the first message carrying first indication information; wherein...

[0098] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state.

[0099] In this embodiment of the invention, after the first transceiver module 301 sends the first message, it is further used for

[0100] A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state;

[0101] Save the downlink beam and the most recent uplink TA.

[0102] In one embodiment of the present invention, the first transceiver module 301 is further used for

[0103] Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources;

[0104] The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

[0105] In one embodiment of the present invention, after the first transceiver module 301 receives the third message, it is further configured to...

[0106] The reference signal received power (RSRP) value corresponding to the downlink beam is judged based on a threshold. If the RSRP value is greater than or equal to the threshold, the downlink beam is used to receive downlink small data packets.

[0107] If the RSRP value is less than the threshold, a random access procedure is initiated to re-establish a beam pair with the base station and update the uplink TA; the downlink beam in the newly established beam pair used in the inactive state is received by the base station through the second indication information.

[0108] In one embodiment of the present invention, the second indication information is further used to indicate the physical uplink control channel (PUCCH) resources used by the terminal in the inactive state for downlink hybrid automatic repeat request (HARQ) feedback.

[0109] In one embodiment of the present invention, after the first transceiver module 301 receives the downlink small data packet, it is further used for

[0110] The PUCCH resource is used to perform HARQ feedback on the transmission of downlink small data packets.

[0111] This invention also provides a small data packet transmission device, such as... Figure 4As shown, the device is used in a base station and includes:

[0112] The second transceiver module 401 is used to receive a first message, wherein the first message carries first indication information; wherein...

[0113] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed.

[0114] In one embodiment of the present invention, after receiving the first message, the second transceiver module 401 is further configured to send a second message, the second message being configured to instruct the terminal to enter an inactive state;

[0115] The second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state.

[0116] In one embodiment of the present invention, the second transceiver module 401 is further used for

[0117] A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

[0118] In one embodiment of the present invention, after the second transceiver module 401 sends the second message, it is further configured to send small data packets on the downlink SPS resources of the downlink beam.

[0119] In one embodiment of the present invention, after the second transceiver module 401 sends the third message, it is further used to...

[0120] Responding to a random access request initiated by the terminal; the random access request is initiated by the terminal when it determines that the RSRP value corresponding to the downlink beam is less than a threshold;

[0121] The beam pair is re-established with the terminal through a random access procedure, and the uplink TA is updated.

[0122] The terminal is again instructed by the second instruction information to receive downlink small data packets in the inactive state using the downlink beam of the newly established beam pair.

[0123] In one embodiment of the present invention, the second indication information is further used to indicate the PUCCH resources used by the terminal for downlink HARQ feedback in the inactive state; correspondingly, the second transceiver module 401 is further used to

[0124] The terminal receives HARQ feedback for the transmission of downlink small data packets using the PUCCH resource.

[0125] This invention also provides a small data packet transmission device, which includes: a processor and a memory for storing a computer program capable of running on the processor.

[0126] When the processor runs the computer program, it performs the following:

[0127] Send a first message, the first message carrying first indication information; wherein,

[0128] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state.

[0129] After sending the first message, the processor is also used to execute the following when running the computer program:

[0130] A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state;

[0131] Save the downlink beam and the most recent uplink TA.

[0132] The processor is also configured to, when running the computer program, perform:

[0133] Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources;

[0134] The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

[0135] After receiving the third message, the processor is also configured to execute the following when running the computer program:

[0136] The reference signal received power (RSRP) value corresponding to the downlink beam is judged based on a threshold. If the RSRP value is greater than or equal to the threshold, the downlink beam is used to receive downlink small data packets.

[0137] If the RSRP value is less than the threshold, a random access procedure is initiated to re-establish a beam pair with the base station and update the uplink TA; the downlink beam in the newly established beam pair used in the inactive state is received by the base station through the second indication information.

[0138] The second indication information is further used to indicate the physical uplink control channel (PUCCH) resources used by the terminal in the inactive state for downlink hybrid automatic repeat request (HARQ) feedback.

[0139] After receiving the downlink small data packet, the processor is also used to execute the following when running the computer program:

[0140] The PUCCH resource is used to perform HARQ feedback on the transmission of downlink small data packets.

[0141] This invention also provides a small data packet transmission device, which includes: a processor and a memory for storing a computer program capable of running on the processor.

[0142] When the processor runs the computer program, it performs the following:

[0143] Receive a first message, the first message carrying first indication information; wherein,

[0144] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed.

[0145] After receiving the first message, the processor is further configured to execute the following when running the computer program:

[0146] Send a second message, which instructs the terminal to enter an inactive state;

[0147] The second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state.

[0148] The processor is also configured to, when running the computer program, perform:

[0149] A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

[0150] After sending the second message, the processor is also used to execute the following when running the computer program:

[0151] Small data packets are transmitted on the downlink SPS resources of the downlink beam.

[0152] After sending the third message, the processor is also used to execute the following when running the computer program:

[0153] Responding to a random access request initiated by the terminal; the random access request is initiated by the terminal when it determines that the RSRP value corresponding to the downlink beam is less than a threshold;

[0154] The beam pair is re-established with the terminal through a random access procedure, and the uplink TA is updated.

[0155] The terminal is again instructed by the second instruction information to receive downlink small data packets in the inactive state using the downlink beam of the newly established beam pair.

[0156] The second indication information is further used to indicate the PUCCH resources used by the terminal for downlink HARQ feedback in the inactive state; correspondingly, the processor is also used to execute the following when running the computer program:

[0157] The terminal receives HARQ feedback for the transmission of downlink small data packets using the PUCCH resource.

[0158] It should be noted that the device provided in the above embodiments is only illustrated by the division of the above program modules when transmitting small data packets. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the device provided in the above embodiments and the corresponding method embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0159] In an exemplary embodiment, the present invention also provides a computer-readable storage medium, which may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM; or it may be a device including one or any combination of the above-mentioned memories, such as a mobile phone, computer, tablet device, personal digital assistant, etc.

[0160] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the following:

[0161] Send a first message, the first message carrying first indication information; wherein,

[0162] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state.

[0163] After the first message is sent, when the computer program is run by the processor, it also executes:

[0164] A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state;

[0165] Save the downlink beam and the most recent uplink TA.

[0166] When the computer program is run by the processor, it also executes:

[0167] Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources;

[0168] The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

[0169] After receiving the third message, when the computer program is run by the processor, it also executes:

[0170] The reference signal received power (RSRP) value corresponding to the downlink beam is judged based on a threshold. If the RSRP value is greater than or equal to the threshold, the downlink beam is used to receive downlink small data packets.

[0171] If the RSRP value is less than the threshold, a random access procedure is initiated to re-establish a beam pair with the base station and update the uplink TA; the downlink beam in the newly established beam pair used in the inactive state is received by the base station through the second indication information.

[0172] The second indication information is further used to indicate the physical uplink control channel (PUCCH) resources used by the terminal in the inactive state for downlink hybrid automatic repeat request (HARQ) feedback.

[0173] After receiving the downlink small data packet, the computer program, when run by the processor, also executes:

[0174] The PUCCH resource is used to perform HARQ feedback on the transmission of downlink small data packets.

[0175] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the following:

[0176] Receive a first message, the first message carrying first indication information; wherein,

[0177] The first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed.

[0178] After receiving the first message, when the computer program is run by the processor, it also executes:

[0179] Send a second message, which instructs the terminal to enter an inactive state;

[0180] The second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state.

[0181] When the computer program is run by the processor, it also executes:

[0182] A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

[0183] After the second message is sent, when the computer program is run by the processor, it also executes:

[0184] Small data packets are transmitted on the downlink SPS resources of the downlink beam.

[0185] After the third message is sent, when the computer program is run by the processor, it also executes:

[0186] Responding to a random access request initiated by the terminal; the random access request is initiated by the terminal when it determines that the RSRP value corresponding to the downlink beam is less than a threshold;

[0187] The beam pair is re-established with the terminal through a random access procedure, and the uplink TA is updated.

[0188] The terminal is again instructed by the second instruction information to receive downlink small data packets in the inactive state using the downlink beam of the newly established beam pair.

[0189] The second indication information is further used to indicate the PUCCH resources used by the terminal for downlink HARQ feedback in the inactive state; correspondingly, when the computer program is run by the processor, it also executes:

[0190] The terminal receives HARQ feedback for the transmission of downlink small data packets using the PUCCH resource.

[0191] In this embodiment of the invention, a terminal with a fixed location can transmit small data packets on downlink SPS resources using the most recently used uplink timing advance (TA) and downlink beam, without having to frequently establish beam pairs through a random access procedure. This not only saves radio resources but also reduces processing complexity, enabling downlink small data packet transmission for inactive terminals.

[0192] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A small data packet transmission method, characterized by, This method is applied to terminals with fixed locations, including: Send a first message, the first message carrying first indication information; wherein, the first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state; Save the downlink beam and the most recent uplink TA; Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources; The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

2. The method of claim 1, wherein, After receiving the third message, the method further includes: The reference signal received power (RSRP) value corresponding to the downlink beam is judged based on a threshold. If the RSRP value is greater than or equal to the threshold, the downlink beam is used to receive downlink small data packets. If the RSRP value is less than the threshold, a random access procedure is initiated to re-establish a beam pair with the base station and update the uplink TA; the downlink beam in the newly established beam pair used in the inactive state is received by the base station through the second indication information.

3. The method of claim 1, wherein, The second indication information is also used to indicate the physical uplink control channel (PUCCH) resources used by the terminal in the inactive state for downlink hybrid automatic repeat request (HARQ) feedback.

4. The method of claim 3, wherein, After receiving the downlink small data packet, the method further includes: The PUCCH resource is used to perform HARQ feedback on the transmission of downlink small data packets.

5. A small data packet transmission method, characterized by, This method is applied to base stations, including: A first message is received, the first message carrying first indication information; wherein, the first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed; A second message is sent, which instructs the terminal to enter an inactive state; wherein the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state; A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

6. The method of claim 5, wherein, After sending the second message, the method further includes: Small data packets are transmitted on the downlink SPS resources of the downlink beam.

7. The method of claim 5, wherein, After sending the third message, the method further includes: Responding to a random access request initiated by the terminal; the random access request is initiated by the terminal when it determines that the RSRP value corresponding to the downlink beam is less than a threshold; The beam pair is re-established with the terminal through a random access procedure, and the uplink TA is updated. The terminal is again instructed by the second instruction information to receive downlink small data packets in the inactive state using the downlink beam of the newly established beam pair.

8. The method of claim 5, wherein, The second indication information is further used to indicate the PUCCH resources used by the terminal for downlink HARQ feedback in the inactive state; correspondingly, the method further includes: The terminal receives HARQ feedback for the transmission of downlink small data packets using the PUCCH resource.

9. A small data packet transmission apparatus characterized by comprising: This device is used in fixed-location terminals and includes: The first transceiver module is used to send a first message, the first message carrying first indication information; wherein, the first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; The first transceiver module is further configured to: A second message is received, which is used to instruct the terminal to enter an inactive state; wherein, the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state; Save the downlink beam and the most recent uplink TA; Receive a third message, the third message being used to instruct the terminal to receive downlink small data packets on downlink semi-static scheduling (SPS) resources; The uplink TA is used to receive downlink small data packets on the downlink SPS resources of the stored downlink beam.

10. A small data packet transmission apparatus characterized by comprising: This device is used in base stations and includes: The second transceiver module is used to receive a first message, the first message carrying first indication information; wherein, the first indication information is used to indicate that the terminal expects to save the most recently used uplink timing advance (TA) and downlink beam when entering the inactive state; the position of the terminal is fixed; The second transceiver module is also used for: A second message is sent, which instructs the terminal to enter an inactive state; wherein the second message carries second indication information; the second indication information is used to indicate the downlink beam used by the terminal when entering the inactive state; A third message is sent, which instructs the terminal to receive downlink small data packets on downlink SPS resources.

11. A small data packet transmission apparatus characterized by comprising: The device includes: a processor and a memory for storing computer programs that can run on the processor. When the processor is used to run the computer program, it performs the steps of the method according to any one of claims 1-4, or the steps of the method according to any one of claims 5-8.

12. A computer readable storage medium having stored thereon a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1-4, or the steps of the method according to any one of claims 5-8.

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