WO2021093192A1 - Tracking semi-persistent scheduling transmissions - Google Patents
Tracking semi-persistent scheduling transmissions Download PDFInfo
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- WO2021093192A1 WO2021093192A1 PCT/CN2020/074596 CN2020074596W WO2021093192A1 WO 2021093192 A1 WO2021093192 A1 WO 2021093192A1 CN 2020074596 W CN2020074596 W CN 2020074596W WO 2021093192 A1 WO2021093192 A1 WO 2021093192A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- This patent document is directed generally to wireless communications.
- This patent document describes, among other things, techniques that monitor and inform the user devices of the actual number of Semi-Persistent Scheduling (SPS) transmissions performed so as to reduce signaling overhead in Hybrid Automatic Repeat request (HARQ) acknowledgement (ACK) feedback.
- SPS Semi-Persistent Scheduling
- HARQ Hybrid Automatic Repeat request acknowledgement
- a wireless communication method includes transmitting, by a base station, a configuration of semi-persistent scheduling (SPS) transmissions to a mobile device; and transmitting, by the base station to the mobile device, an indication of actual SPS transmissions performed based on the configuration.
- SPS semi-persistent scheduling
- a wireless communication method includes receiving, by a user device, a configuration of semi-persistent scheduling (SPS) transmissions from a base station; and receiving, by the user device from the base station, an indication of actual SPS transmissions performed based on the configuration.
- SPS semi-persistent scheduling
- a communication apparatus in another example aspect, includes a processor that is configured to implement an above-described method.
- a computer-program storage medium includes code stored thereon.
- the code when executed by a processor, causes the processor to implement a described method.
- FIG. 1 illustrates an example set of Semi-Persistent Scheduling (SPS) configurations.
- SPS Semi-Persistent Scheduling
- FIG. 2 is a flowchart representation of a wireless communication method in accordance with the disclosed technology.
- FIG. 3 is a flowchart representation of another wireless communication method in accordance with the disclosed technology.
- FIG. 4 illustrates an example of determining the actual number of SPS transmissions in accordance with the disclosed technology.
- FIG. 5 illustrates another example of determining the actual number of SPS transmissions in accordance with the disclosed technology.
- FIG. 6A illustrates an example of symbols used for transmitting the actual number of SPS transmissions in the physical layer in accordance with the disclosed technology.
- FIG. 6B illustrates another example of symbols used for transmitting the actual number of SPS transmissions in the physical layer in accordance with the disclosed technology.
- FIG. 6C illustrates another example of symbols used for transmitting the actual number of SPS transmissions in the physical layer in accordance with the disclosed technology.
- FIG. 6D illustrates another example of symbols used for transmitting the actual number of SPS transmissions in the physical layer in accordance with the disclosed technology.
- FIG. 6E illustrates another example of symbols used for transmitting the actual number of SPS transmissions in the physical layer in accordance with the disclosed technology.
- FIG. 6F illustrates another example of symbols used for transmitting the actual number of SPS transmissions in the physical layer in accordance with the disclosed technology.
- FIG. 7 illustrates an example of transmitting a total number of SPS transmissions in the last few SPS transmissions in accordance with the disclosed technology.
- FIG. 8 illustrates an example scenario in which eight downlink slots are followed by two uplink slots that support sub-slots.
- FIG. 9 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied.
- FIG. 10 is a block diagram representation of a portion of a radio station in accordance with one or more embodiments of the present technology can be applied.
- Section headings are used in the present document only to improve readability and do not limit scope of the disclosed embodiments and techniques in each section to only that section. Certain features are described using the example of Fifth Generation (5G) wireless protocol. However, applicability of the disclosed techniques is not limited to only 5G wireless systems.
- 5G Fifth Generation
- SPS semi-persistent scheduling
- PDSCH Physical Downlink Shared Channel
- a user equipment can be configured with up to eight sets of SPS transmissions.
- the Hybrid Automatic Repeat request (HARQ) acknowledgement (ACK) corresponding to a SPS transmission is currently generated according to the SPS configuration (s) .
- FIG. 1 illustrates an example set of SPS configurations.
- a UE is configured with two sets of SPS configurations for two carriers respectively: SPS0 and SPS1 are configured for Carrier0; SPS2 and SPS3 are configured for Carrier1.
- the HARQ-ACK codebooks of these SPS transmissions are structured as follows:
- HARQ-ACK1 is formed for SPS transmission 101 of Carrier0 according to the corresponding downlink (DL) slot in which the SPS transmission 101 is located.
- HARQ-ACK2 is formed for SPS transmission 103 of Carrier0 according to the corresponding DL slot in which the SPS transmission 103 is located.
- HARQ-ACK3 is formed for SPS transmission 105 of Carrier1 according to the corresponding DL slot in which the SPS transmission 105 is located.
- SPS transmission 107 of Carrier1 is not performed. However, HARQ NACK is formed nonetheless based on the SPS configuration.
- the remaining HARQ-ACKs are formed corresponding to the configured SPS transmissions.
- a SPS transmission is not performed (e.g., SPS transmission 109 of Carrier0)
- a NACK is formed nonetheless.
- HARQ-ACK information is generated at each SPS transmission period regardless of whether the SPS transmission is actually performed.
- the UE does not receive the SPS transmission but still generates HARQ-ACK information as NACK.
- the HARQ ACKs/NACKs are then concatenated according to predefined rules and a HARQ-ACK codebook is determined accordingly.
- the NACKs generated for SPS transmissions that have not actually been transmitted thus result in an increase in the HARQ-ACK codebook overhead.
- many NACKs can be generated for SPS transmissions that were not actually performed.
- FIG. 2 is a flowchart representation of a wireless communication method 200 in accordance with the disclosed technology.
- the method 200 includes, at operation 210, transmitting, by a base station, a configuration of semi-persistent scheduling (SPS) transmissions.
- the method 200 also includes, at operation 220, transmitting, by the base station to the mobile device, an indication of actual SPS transmissions performed based on the configuration.
- the indication indicates a number of the actual SPS transmissions that have been performed.
- the indication and an actual SPS transmission are transmitted simultaneously.
- the indication is transmitted as a Medium Access Control (MAC) control element.
- the indication is transmitted as a physical layer indication.
- the method includes repeatedly transmitting the indication in case the indication is associated with a last actual SPS transmission.
- the indication is represented using L bits, L being a value greater than or equal to 2.
- the indication is transmitted as a Demodulation Reference Signal (DMRS) sequence.
- the indication is associated with a sequence number of the DMRS sequence.
- a number of actual SPS transmissions performed is M and the indication has a value in a range of 0 to N, M and N being integers greater than or equal to 0.
- the value of the indication is circularly repeated to represent M actual SPS transmissions.
- the method also includes indicating, by the base station to the user device, a total number of the actual SPS transmissions performed.
- FIG. 3 is a flowchart representation of a wireless communication method 300 in accordance with the disclosed technology.
- the method 300 includes, at operation 310, receiving, by a user device, a configuration of semi-persistent scheduling (SPS) transmissions from a base station.
- the method 300 also includes, at operation 320, receiving, by the user device from the base station, an indication of actual SPS transmissions performed based on the configuration.
- SPS semi-persistent scheduling
- the indication indicates a number of the actual SPS transmissions that have been performed. In some embodiments, the indication and an actual SPS transmission are transmitted simultaneously. In some embodiments, the indication is received as a Medium Access Control (MAC) control element. In some embodiments, the indication is received as a physical layer indication. In some embodiments, the method includes repeatedly receiving the indication in case the indication is associated with a last actual SPS transmission. In some embodiments, the indication is represented using L bits, L being a value greater than or equal to 2.
- the indication is received as a Demodulation Reference Signal (DMRS) sequence.
- the indication is associated with a sequence number of the DMRS sequence.
- a number of actual SPS transmissions performed is M and the indication has a value in a range of 0 to N, M and N being integers greater than or equal to 0.
- the value of the indication is circularly repeated to represent M actual SPS transmissions.
- the method also includes receiving, the user device from the base station, a total number of the actual SPS transmissions performed.
- the above-described methods provide means to track the actual number of SPS transmission performed to reduce the number of NACKs generated for HARQ-ACK information, thereby reducing signaling overhead.
- the base station sends an indicator indicating the actual number of SPS transmission to the UE.
- the indication of the actual number of SPS transmissions performed can be transmitted as a MAC CE.
- a counter can be introduced as the indicator to track the number of actual SPS transmission (s) performed.
- the counter indicating the number of SPS transmissions that have been performed can be transmitted together with the SPS transmission in a MAC CE. That is, a counter is included in each of the SPS transmission that is performed. This way, after the UE receives the SPS transmission and decodes it, the UE can determine the number of SPS transmissions that have been performed so far based on the MAC CE. When no actual transmission occurs at a particular SPS period, the UE does not receive the MAC CE that includes the count. The UE then can determine whether HARQ ACK/NACK needs to be generated for the SPS transmission (s) to avoid excessive invalid NACKs in the HARQ-ACK codebook.
- the counter can be represented by one or more bits.
- FIG. 4 illustrates an example of determining the actual number of SPS transmissions in accordance with the disclosed technology.
- two bits in a MAC CE can be used to represent the counter.
- the value of the counter is in a range of [0, 3] and can be circularly repeated to represent a larger number of SPS transmissions.
- values of 0 to 3 can represent 1st to 4th SPS transmissions (e.g., counter 0: SPS transmission 1, counter 1: SPS transmission 2, ...counter 3: SPS transmission 4) .
- the same values can be circularly repeated to represent 5th to 8th SPS transmissions (e.g., counter 0: SPS transmission 5, ...counter 3: SPS transmission 8) .
- more bits e.g., 4 bits
- each SPS configuration of the carrier is given a separate counter.
- a counter value of ‘00’ is transmitted as a MAC CE with the SPS transmission 401 to indicate that one SPS transmission (the current SPS transmission 401) has been performed at that point.
- the counter is then incremented to be ‘01’ for SPS transmission 402.
- SPS transmission 403 is skipped even though it is configured.
- SPS transmission 404 the counter is incremented again to indicate that so far three SPS transmissions 401, 402, 404 have been actually performed.
- a counter value of ‘00’ is transmitted as a MAC CE with SPS transmission 411.
- SPS transmission 412 is skipped, so a counter value of ‘01’ is transmitted as a MAC CE with SPS transmission 413 to indicate that two SPS transmissions 411, 413 have been actually performed.
- transmissions of the Demodulation Reference Signal can be used as an indicator to indicate the counter.
- N DMRS sequences are used for the transmissions of the DMRS for each SPS configuration, where N > 0.
- Each sequence is assigned a sequence number having a value between 0 to N-1.
- the sequence number corresponds to the counter value (0 to N-1) to indicate the number of SPS transmissions that have been performed (1 to N) .
- Each SPS configuration of the carrier is given a separate counter.
- FIG. 5 illustrates an example of determining the actual number of SPS transmissions in accordance with the disclosed technology.
- Each SPS transmission is associated with a DMRS transmission.
- a DMRS sequence having a sequence number of 0 is associated with SPS transmission 501.
- a DMRS sequence having a sequence number of 1 is associated with SPS transmission 502.
- SPS transmission 503 is skipped, so no DMRS transmission is performed.
- a DMRS sequence having a sequence number of 2 is transmitted.
- the sequence numbers can be circularly repeated.
- a sequence number of 0 is used to indicate that the number of SPS transmissions performed is 5
- the counter can also be transmitted as a physical layer indicator.
- the base station and the UE can determine the N1 units of resources according to one of the following ways:
- the N1 units of resources start at the first symbol 601 after the first DMRS symbol in the resources configured for the SPS transmission.
- the N1 units of resources start at the first symbol 611 after the last DMRS symbol as illustrated in FIG. 6B.
- resource units occupied by DMRS in the frequency domain are skipped.
- the N1 units of resources start at the first DMRS symbol in the resources configured for the SPS transmission.
- the N1 units of resources start at the last of the consecutive DMRS symbols as shown in FIG. 6D.
- resource units occupied by DMRS in the frequency domain are skipped.
- the N1 units of resources start at the symbol 621 before the first DMRS symbol of the SPS transmission resources as illustrated in FIG. 6E.
- the N1 units of resources start at the symbol 631 before the last DMRS as illustrated in FIG. 6F.
- resource units occupied DMRS in the frequency domain are skipped.
- the counter can be repeated (e.g., using a repetition factor) to improve reliability.
- the HARQ-ACK codebook of multiple SPS transmissions can be constructed differently.
- a counter that tracks the number of actual SPS transmissions for all carriers can be provided.
- multiple SPS transmissions of different carriers are organized in sequence according to the chronological order of DL slots. If DL slots of multiple SPS transmissions align in the time domain, the transmissions are organized in order based on the carrier indices. If the carrier indices are the same (e.g., the transmissions are associated with the same carrier) , the transmissions are ordered based on the transmission indices.
- the counter can track the number of actual SPS transmissions for all carriers.
- the counter can be transmitted as a MAC CE, as a physical layer indicator, or be associated with a DMRS sequence for each SPS transmission as described in Embodiments 1-3.
- a HARQ-ACK codebook is then determined based on the all the SPS transmissions for all carriers. In some embodiments, the counter indicates the total number of SPS transmissions transmitted according to different SPS configurations associated with different carriers.
- the base station can transmit a second counter indicating the total number of SPS transmissions (e.g., Count_total) for all SPS configurations in a few SPS transmissions.
- Count_total the total number of SPS transmissions
- the base station can transmit Count_total in the last M SPS transmission corresponding to a HARQ-ACK codebook.
- the base station transmits Count_total in the last four SPS transmissions 701-704 within the SPS period.
- the transmission of Count_total can be performed similar to the counter tracking the actual number of SPS transmissions described in Embodiments 1-3.
- the SPS transmissions that carry Count_total are determined based on a time-domain offset B from the beginning of HARQ-ACK transmission on the Physical Uplink Control Channel (PUCCH) .
- the beginning of HARQ-ACK 705 on PUCCH is at time-domain position C.
- the SPS transmission (s) e.g., 706) after the time-domain location (C-B) are not used to carry Count_total.
- the offset value B can be determined based on two values B1 and/or B2.
- B1 can be one of the following values: T proc, 1 as defined in 3GPP TS38.214, N, N1, N2, N3, Z, Z’, T proc, 2 or T proc, CSI as defined in 3GPP TS38.213, or other predefined values.
- B2 can be an optional value that is either 0, 1, or 2 symbols according to UE capabilities.
- the base station can determine an SPS transmission pattern (e.g., a bitmap) for the UE to provide HARQ-ACK feedback accordingly.
- the base station can configure an SPS pattern for the required HARQ-ACK feedback according to the actual service requirement.
- priority can be given to periodic services.
- the SPS pattern is configured according to the service period such that there is no or fewer skipped SPS transmissions. After receiving the SPS pattern, the UE only needs to provide HARQ feedback according to the pattern.
- a UE is configured with multiple SPS configurations.
- the SPS pattern can indicate that some SPS transmissions are skipped due to service periodicity. That is, the SPS pattern indicates the actual number of SPS transmissions to be performed (e.g., according to the service periodicity) .
- the UE receives the SPS pattern from the base station, the UE generates corresponding HARQ-ACK feedback according to the pattern to determine the HARQ-ACK codebook, thereby avoiding unnecessary HARQ-ACK information when no transmission actually occurs.
- the base station transmits a Downlink Control Information (DCI) message to the UE indicating the time-domain location of the HARQ-ACK information.
- the DCI message includes a value k1 indicating the number of slots between the reception of data on Physical Downlink Shared Channel (PDSCH) and the HARQ-ACK transmission.
- the SPS transmission period can be small.
- the minimum SPS transmission period is currently set at one slot and can potentially become smaller than one slot.
- uplink transmissions now support sub-slots.
- An uplink (UL) slot can be divided into 2 or 7 sub-slots. Each sub-slot can be used to transmit HARQ-ACK information.
- the value of k1 can be adjusted to be based on sub-slots.
- an uplink slot is configured to include 7 sub-slots.
- the value of k1 is sub-slot based. That is, each slot (uplink and/or downlink) is counted as 7 sub-slots even though downlink slots do not support sub-slots.
- FIG. 8 illustrates an example scenario in which eight downlink slots 801-808 are followed by two uplink slots 809-810 supporting sub-slots.
- the HARQ-ACK is scheduled in sub-slot 6 of uplink slot 810.
- the maximum value of k1 is limited to 15, which corresponds to a downlink slot rather than an uplink slot for HARQ-ACK transmission.
- a special slot here is a slot that includes both uplink and downlink symbols.
- the value of k1 can indicate the number of slots after the initial slots.
- the number of slots can include downlink, uplink, and/or special slots.
- the number of slots can include uplink and/or special slots.
- the value of k1 can indicate the number of sub-slots after the initial slots.
- the number of sub-slots can include downlink, uplink, and/or special slots (each slot is counted as 2 or 7 sub-slots) .
- the number of sub-slots can include uplink and/or special slots (each slot is counted as 2 or 7 sub-slots) .
- the base station transmits to the UE a DCI message that includes a single value k1 indicating the time-domain location of the HARQ-ACK information. That is, HARQ-ACK information corresponding to all PDSCH transmissions is fed back to the base station in a single uplink slot according to k1, potentially leading to performance issues in the PUCCH.
- the base station can configure a correspondence between downlink slot (s) of PDSCH and the uplink slot for HARQ-ACK feedback. For example, referring back to FIG. 8, the first four downlink slots 801-804 correspond to uplink slot 809, and the next four downlink slots 805-808 correspond to uplink slot 810.
- the base station can indicate the correspondence via a Radio Resource Control (RRC) signaling message.
- RRC Radio Resource Control
- configuring such correspondence removes the need of having a DCI message indicating k1 --the UE can transmit HARQ-ACK information in slot 809 after receiving data in downlink slots 801-804 and in slot 810 after receiving data in downlink slots 805-808.
- the correspondence can be used in conjunction with the DCI indication.
- the UE can ignore k1 value in the DCI signaling (e.g., the k1 value can be invalid, or the DCI signaling may not include the k1 value) .
- the UE can continue to use the DCI signaling to determine HARQ-ACK transmissions based on with slots or sub-slots as discussed in Embodiment 7.
- FIG. 9 shows an example of a wireless communication system 900 where techniques in accordance with one or more embodiments of the present technology can be applied.
- a wireless communication system 900 can include one or more base stations (BSs) 905a, 905b, one or more wireless devices 910a, 910b, 910c, 910d, and a core network 925.
- a base station 905a, 905b can provide wireless service to wireless devices 910a, 910b, 910c and 910d in one or more wireless sectors.
- a base station 905a, 905b includes directional antennas to produce two or more directional beams to provide wireless coverage in different sectors.
- the core network 925 can communicate with one or more base stations 905a, 905b.
- the core network 925 provides connectivity with other wireless communication systems and wired communication systems.
- the core network may include one or more service subscription databases to store information related to the subscribed wireless devices 910a, 910b, 910c, and 910d.
- a first base station 905a can provide wireless service based on a first radio access technology
- a second base station 905b can provide wireless service based on a second radio access technology.
- the base stations 905a and 905b may be co-located or may be separately installed in the field according to the deployment scenario.
- the wireless devices 910a, 910b, 910c, and 910d can support multiple different radio access technologies.
- the techniques and embodiments described in the present document may be implemented by the base stations of wireless devices described in the present document.
- FIG. 10 is a block diagram representation of a portion of a radio station in accordance with one or more embodiments of the present technology can be applied.
- a radio station 1005 such as a base station or a wireless device (or UE) can include processor electronics 1010 such as a microprocessor that implements one or more of the wireless techniques presented in this document.
- the radio station 805 can include transceiver electronics 1015 to send and/or receive wireless signals over one or more communication interfaces such as antenna 1020.
- the radio station 1005 can include other communication interfaces for transmitting and receiving data.
- Radio station 1005 can include one or more memories (not explicitly shown) configured to store information such as data and/or instructions.
- the processor electronics 1010 can include at least a portion of the transceiver electronics 1015.
- at least some of the disclosed techniques, modules or functions are implemented using the radio station 1005.
- the radio station 1005 may be configured to perform the methods described herein.
- the present document discloses techniques that can be embodied in various embodiments to reduce HARQ-ACK signaling overhead on the uplink control channel based on the actual number of SPS transmissions performed.
- the disclosed and other embodiments, modules and the functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations of one or more of them.
- the disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus.
- the computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more them.
- data processing apparatus encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers.
- the apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.
- a propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus.
- a computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
- a computer program does not necessarily correspond to a file in a file system.
- a program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document) , in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code) .
- a computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
- the processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output.
- the processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) .
- processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer.
- a processor will receive instructions and data from a read only memory or a random-access memory or both.
- the essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data.
- a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
- mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
- a computer need not have such devices.
- Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks.
- semiconductor memory devices e.g., EPROM, EEPROM, and flash memory devices
- magnetic disks e.g., internal hard disks or removable disks
- magneto optical disks e.g., CD ROM and DVD-ROM disks.
- the processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
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Description
Claims (24)
- A method of wireless communication, comprising:transmitting, by a base station, a configuration of semi-persistent scheduling (SPS) transmissions to a mobile device; andtransmitting, by the base station to the mobile device, an indication of actual SPS transmissions performed based on the configuration.
- The method of claim 1, wherein the indication indicates a number of the actual SPS transmissions that have been performed.
- The method of claim 1 or 2, wherein the indication and an actual SPS transmission are transmitted simultaneously.
- The method of claim 3, wherein the indication is transmitted as a Medium Access Control (MAC) control element.
- The method of claim 3, wherein the indication is transmitted as a physical layer indication.
- The method of any one or more of claims 1 to 5, comprising:repeatedly transmitting the indication in case the indication is associated with a last actual SPS transmission.
- The method of any one or more of claims 1 to 5, wherein the indication is represented using L bits, L being a value greater than or equal to 2.
- The method of claim 1 or 2, wherein the indication is transmitted as a Demodulation Reference Signal (DMRS) sequence.
- The method of claim 8, wherein the indication is associated with a sequence number of the DMRS sequence.
- The method of any one or more of claims 1 to 9, wherein a number of actual SPS transmissions performed is M and the indication has a value in a range of 0 to N, M and N being integers greater than or equal to 0, and wherein the value of the indication is circularly repeated to represent M actual SPS transmissions.
- The method of any one or more of claims 1 to 10, comprising:indicating, by the base station to the user device, a total number of the actual SPS transmissions performed.
- A method for wireless communication, comprising:receiving, by a user device, a configuration of semi-persistent scheduling (SPS) transmissions from a base station; andreceiving, by the user device from the base station, an indication of actual SPS transmissions performed based on the configuration.
- The method of claim 12, wherein the indication indicates a number of the actual SPS transmissions that have been performed.
- The method of claim 12 or 13, wherein the indication and an actual SPS transmission are transmitted simultaneously.
- The method of claim 14, wherein the indication is received as a Medium Access Control (MAC) control element.
- The method of claim 14, wherein the indication is received as a physical layer indication.
- The method of any one or more of claims 12 to 16, comprising:repeatedly receiving the indication in case the indication is associated with a last actual SPS transmission.
- The method of any one or more of claims 12 to 17, wherein the indication is represented using L bits, L being a value greater than or equal to 2.
- The method of claim 12 or 13, wherein the indication is received as a Demodulation Reference Signal (DMRS) sequence.
- The method of claim 19, wherein the indication is associated with a sequence number of the DMRS sequence.
- The method of any one or more of claims 1 to 20, wherein a number of actual SPS transmissions performed is M and the indication has a value in a range of 0 to N, M and N being integers greater than or equal to 0, and wherein the value of the indication is circularly repeated to represent M actual SPS transmissions.
- The method of any one or more of claims 1 to 21, comprising:receiving, the user device from the base station, a total number of the actual SPS transmissions performed.
- A communication apparatus, comprising a processor configured to implement a method recited in any one or more of claims 1 to 22.
- A computer program product having code stored thereon, the code, when executed by a processor, causing the processor to implement a method recited in any one or more of claims 1 to 22.
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US20170134140A1 (en) * | 2015-11-06 | 2017-05-11 | Innovative Technology Lab Co., Ltd. | Apparatus and method for performing hybrid automatic repeat request operation in wireless communication system supporting carrier aggregation |
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LG ELECTRONICS: "Discussion on details of (E)PDCCH design for uplink SPS", 3GPP TSG RAN WG1 MEETING #86 R1-166837, 26 August 2016 (2016-08-26), XP051142482 * |
LG ELECTRONICS: "Discussion on details of UE reporting", 3GPP TSG RAN WG1 MEETING #85 R1-164515, 27 May 2016 (2016-05-27), XP051096411 * |
LG ELECTRONICS: "Discussion on UL SPS for V2X", 3GPP TSG RAN WG1 MEETING #85 R1-164538, 27 May 2016 (2016-05-27), XP051096397 * |
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