CN116491077A

CN116491077A - Network communication service scheduling using semi-persistent scheduling

Info

Publication number: CN116491077A
Application number: CN202180077293.1A
Authority: CN
Inventors: 寇帅华; 张晨晨; 刘星; 郝鹏; 魏兴光
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2023-07-25
Also published as: WO2022193223A1

Abstract

Methods, systems, and devices are described for scheduling multicast and broadcast services using semi-persistent scheduling in mobile communication technology. One example method for wireless communication includes: the wireless device receives data configured on one of the plurality of beams using one or more semi-persistent scheduling SPS configurations from the network node and transmits an acknowledgement feedback message in response to the receiving. Among other features and benefits, the disclosed techniques advantageously enable SPS physical downlink shared channels to be transmitted for multicast and broadcast services or unicast services in different beams, redundant transmissions to be identified in SPS transmissions, and SPS to be associated with multiple multicast and broadcast services.

Description

Network communication service scheduling using semi-persistent scheduling

Technical Field

This document relates generally to wireless communications.

Prior Art

Wireless communication technology is moving the world to an increasingly connected and networked society. The rapid growth of wireless communications and advances in technology have led to greater demands for capacity and connectivity. In other respects, energy consumption, equipment cost, spectral efficiency, and latency are also important to meet the needs of various communication scenarios. Next generation systems and wireless communication technologies will provide support for unicast, multicast and broadcast services for an increasing number of users and devices compared to existing wireless networks.

Disclosure of Invention

This document relates to methods, systems and apparatus for scheduling network communication services in mobile communication technology using Semi-persistent scheduling (Semi-Persistent Scheduling, SPS), including generation 5 (5) ^th Generation) and New Radio (NR) communication systems.

In one exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: the network node configures one or more semi-persistent scheduling configurations having a plurality of beams; and based on the configuration, transmitting data through at least one wireless device in a cell served by the network node on the plurality of beams using one or more semi-persistent scheduling configurations.

In another exemplary aspect, a method of wireless communication is disclosed. The method comprises the following steps: the wireless device receives, from a network node, data configured on one of a plurality of beams using one or more semi-persistent scheduling configurations; and in response to the receiving, sending an acknowledgement feedback message.

In yet another exemplary aspect, the above-described method is embodied in the form of processor-executable code and stored in a computer-readable program medium.

In yet another exemplary embodiment, an apparatus configured or operable to perform the above method is disclosed.

The foregoing and other aspects and implementations thereof are described in more detail in the accompanying drawings, description and claims.

Drawings

Fig. 1 illustrates one example of a Base Station (BS) and User Equipment (UE) in wireless communication according to some embodiments of the presently disclosed technology.

Fig. 2 shows one example of SPS physical downlink shared channel (Physical Downlink Shared Channel, PDSCH).

Fig. 3 shows one example of PDSCH occasions with repetition.

FIG. 4 illustrates one example of a multiple SPS configuration.

Fig. 5 shows one example of SPS transmissions using a transmission window.

FIG. 6 shows another example of SPS transmissions.

Fig. 7 shows yet another example of SPS transmissions supporting three Multicast and Broadcast Services (MBS).

Fig. 8A and 8B illustrate examples of methods of wireless communication in accordance with some embodiments of the presently disclosed technology.

Fig. 9 is a block diagram of a portion of an apparatus in accordance with some embodiments of the presently disclosed technology.

Detailed Description

In existing 5G NR systems or future wireless systems, semi-persistent scheduling (Semi-Persistent Scheduling, SPS) is designed to reduce control channel overhead for certain services (e.g., voIP (voice over internet protocol) based services) by using longer periods with configuration, activation, transmission and release procedures. In the upcoming 5G NR system supporting Multiple-Input-Multiple-Output (MIMO) and beamforming capabilities, SPS transmissions can only use a single beam. For Multicast and Broadcast Services (MBS), beam scanning is used to cover all wireless devices served in a cell, but using MBS is still not compatible with semi-persistent scheduling, which can only use a single beam. For unicast services, multiple beams are used to improve the reliability of transmissions between a network and User Equipment (UE).

Among other features and benefits, embodiments of the disclosed technology advantageously enable SPS physical downlink shared channels (Physical Downlink Shared Channel, PDSCH) to be transmitted for MBS or unicast services in different beams, identifying redundant transmissions in SPS transmissions, and associating SPS with multiple MBS.

Fig. 1 shows one example of a wireless communication system (e.g., LTE (long term evolution), 5G, or New Radio (NR) cellular network) including a Base Station (BS) 120 and one or more User Equipments (UEs) 111, 112, and 113. In some embodiments, the downlink transmission (141, 142, 143) includes data transmission using one or more SPS data channels on multiple beams. In response, at least one UE sends (131, 132, 133) a hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) Acknowledgement (ACK) message to BS 120. The UE may be, for example, a smart phone, a tablet, a mobile computer, a machine-to-machine (Machine to Machine, M2M) Device, a terminal, a mobile Device, an internet of things (Internet of Things, ioT) Device, a Device-to-Device (D2D) Device, a vehicle-to-vehicle (Vehicle to Vehicle, V2V) Device, or the like.

The section headings and subheadings are used in this document for ease of understanding and are not intended to limit the scope of the disclosed techniques and embodiments to certain sections. Thus, the embodiments disclosed in the different sections can be used with each other. Moreover, this document uses examples from the 3GPP (third generation partnership project) New Radio (NR) network architecture and 5G protocols only to facilitate understanding, and the disclosed techniques and embodiments may be implemented in other wireless systems using communication protocols other than the 3GPP protocols.

Example 1

In some embodiments, a Semi-persistent scheduling (Semi-Persistent Scheduling, SPS) configuration is configured with multiple beams. The SPS configuration includes a plurality of transmission opportunities having a period. The network may configure multiple beams for each of these occasions. Each occasion is associated (e.g., corresponds to) one beam. PDSCH transmissions for a certain occasion are transmitted by using the corresponding beam.

In some embodiments, a plurality of transmission configuration indicator (Transmission Configuration Indicator, TCI) states (e.g., a list of TCI states) and/or a sequence of a plurality of TCI states are configured for the SPS. Each transmission occasion is associated with one TCI state, and PDSCH is transmitted together with the associated TCI state at one occasion. The TCI state includes a Downlink (DL) Reference Signal (RS) and corresponding Quasi Co-Location (QCL) parameters. Transmissions associated with the TCI state have the same or similar QCL parameters as DL RSs in the TCI state. The DL RS includes a channel state information reference signal (Channel State Information Reference Signal, CSI-RS), a synchronization signal, and a physical broadcast channel block (Synchronization Signal And Physical Broadcast Channel Block, SS/PBCH block, or SSB).

In some embodiments, the control information may be configured to activate SPS transmissions. After activation, a transmission opportunity is cyclically associated with the TCI state from the first TCI state and is based on the order of the plurality of TCI states. For example, a first transmission opportunity after activation is associated with a first TCI state, a second transmission opportunity after activation is associated with a second TCI state, and so on. The next transmission opportunity after the transmission associated with the last TCI state is associated with the first TCI state, i.e., a round robin association based on TCI states.

In some embodiments, the control information indicates an active TCI state of the SPS transmissions and activates the SPS transmissions, the active TCI state being one of a plurality of TCI states. After activation, the TCI states are cyclically associated with the transmission opportunity from the indicated active TCI according to a sequence of the plurality of TCI states and based on the sequence of the plurality of TCI states. For example, a first opportunity after activation is associated with the indicated TCI state, a second transmission opportunity after activation is associated with the next TCI state after the indicated activated TCI state, and so on.

In some embodiments, starting from a transmission opportunity associated with a particular TCI state, the transmission on each of the subsequent transmission opportunities carries the same data (or transport block) until the next opportunity associated with the particular TCI state. The particular TCI state is the first TCI state in the TCI state list or indicated by the network. For transmissions carrying the same data, the UE sends only one hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) Acknowledgement (ACK) feedback message. More specifically, the UE transmits HARQ-ACK information corresponding to only one of these transmissions. For example, the UE transmits only HARQ-ACK feedback corresponding to transmission of the TCI state indicated by the network or indicated in the control information. Alternatively, the UE only sends HARQ-ACK feedback corresponding to some transmission occasions indicated by the network. For transmission occasions associated with other TCI states not indicated by the network or not configured by the network, the UE does not send a corresponding HARQ-ACK feedback message.

Fig. 2 shows one example of SPS PDSCH. As shown in the figure, the SPS includes several PDSCH opportunities, labeled PDSCH 1, PDSCH 2, PDSCH 3, PDSCH 4, and PDSCH 5. The TCI states for SPS configuration are TCI state 1, TCI state 2, TCI state 3, and TCI state 4, and the order of these TCI states is TCI state 1, TCI state 2, TCI state 3, TCI state 4.

When downlink control information (Downlink Control Information, DCI) activates SPS and is indicated by DCI, the first PDSCH occasion (PDSCH 1) is associated with TCI state 1, PDSCH 2 is associated with TCI state 2, PDSCH 3 is associated with TCI state 3, PDSCH 4 is associated with TCI state 4, and PDSCH 5 is associated with TCI state 1 (based on the cyclic association described above).

The transmission associated with the first TCI state (e.g., TCI state 1) and the transmission on the subsequent transmission occasion carry the same data (or transport block) until the next occasion with the first TCI state. Thus, in this example, PDSCH 1, PDSCH 2, PDSCH 3, and PDSCH 4 carry the same transport block, and PDSCH 5, PDSCH 6, PDSCH 7, PDSCH 8 (not all shown in fig. 2) carry another transport block.

In one example, the network may configure the UE to send HARQ-ACK feedback only for PDSCH with TCI state 2. In this case, the UE transmits only HARQ-ACK feedback corresponding to PDSCH 2 and PDSCH 6. In another example, the network may configure the UE to send HARQ-ACK feedback for PDSCH only every four occasions (e.g., at the first occasion, the fifth occasion, the ninth occasion, and so on) starting from the first occasion. In this case, the UE transmits only HARQ-ACK feedback corresponding to PDSCH 1 and PDSCH 5.

In some embodiments, the DCI activates SPS and indicates TCI state 3 for SPS PDSCH transmission, which results in the first PDSCH occasion (PDSCH 1) being associated with TCI state 3. PDSCH 2 is then associated with TCI state 4, PDSCH 3 is associated with TCI state 1, PDSCH 4 is associated with TCI state 2, PDSCH 5 is associated with TCI state 3, and so on. The UE only transmits HARQ-ACK feedback corresponding to the PDSCH associated with the TCI state (e.g., TCI state 3) indicated in the DCI. In this case, the UE transmits only HARQ-ACK feedback corresponding to PDSCH 1 and PDSCH 5.

Example 2

In some embodiments, the SPS is configured with PDSCH repetition and multiple beams. Each repeated association (e.g., corresponding to) one beam. PDSCH repetition is transmitted by using the corresponding beam. In this case, the PDSCH is repeatedly transmitted with different beams.

In some embodiments, a plurality of transmission configuration indicator (Transmission Configuration Indicator, TCI) states (e.g., a list of TCI states) and/or a sequence of a plurality of TCI states are configured for the SPS. PDSCH repetition is configured for SPS. Each PDSCH repetition (e.g., PDSCH repetition occasion) is associated with one TCI state. PDSCH on repetition occasions is transmitted by using the associated TCI state.

Starting from the first PDSCH repetition, the PDSCH repetition is associated with a TCI state starting from the first TCI state. In one example, PDSCH is cyclically associated with TCI state from the first TCI state. In another example, starting with the first PDSCH repetition, every D PDSCH repetitionsAssociated with one TCI state starting from the first TCI state. In one example, the total number of PDSCH repetitions is E and the total number of TCI states is F. Starting from the first PDSCH repetition, everyOr->The PDSCH repetition is associated with one TCI state starting from the first TCI state. In this example, the first +.>Or->The PDSCH repetition is associated with the first TCI state, the second +.>Or->The PDSCH repetition is associated with the second TCI state and so on. Here, in the control information, the active TCI state activating SPS is invalid. In other words, the active TCI state does not change the association relationship between the PDSCH repetition and the TCI state described above. This results in the UE ignoring the active TCI state indicated in the control information that activates SPS. The network indicates one of the plurality of TCI states to the UE, and the UE receives (e.g., detects, decodes) only PDSCH repetitions associated with the one of the plurality of TCI states.

Fig. 3 shows one example of SPS PDSCH with repetition. As shown in the figure, the SPS includes several repeated PDSCH opportunities, labeled PDSCH 1A, PDSCH 1B, PDSCH 1C, PDSCH 1D, PDSCH 2A, PDSCH 2B, PDSCH C and PDSCH 2D. PDSCH 1A, PDSCH 1B, PDSCH C and PDSCH 1D are the first transmission beams. The transport block is repeatedly transmitted on PDSCH 1A, PDSCH 1B, PDSCH 1C, PDSCH 1D. PDSCH 2A, PDSCH 2B, PDSCH C and PDSCH 2D are second transmission bundles. The transport block is repeatedly transmitted on PDSCH 2A, PDSCH 2B, PDSCH C and PDSCH 2D. The configured TCI states include TCI state 1 and TCI state 2.

In one example, for the first transmission bundle, PDSCH 1A is associated with TCI state 1, PDSCH 1B is associated with TCI state 2, PDSCH 1C is associated with TCI state 1, and PDSCH 1D is associated with TCI state 2. For the second transmission bundle, PDSCH 2A is associated with TCI state 1, PDSCH 2B is associated with TCI state 2, PDSCH 2C is associated with TCI state 1, and PDSCH 2D is associated with TCI state 2. In another example, PDSCH 1A and PDSCH 1B are associated with TCI state 1, PDSCH 1C and PDSCH 1D are associated with TCI state 2, and PDSCH 2A and PDSCH 2B are associated with TCI state 1, PDSCH 2C and PDSCH 2D are associated with TCI state 2 for the first transmission beam.

Example 3

In some embodiments, a Multicast and Broadcast Service (MBS) is associated with multiple SPS configurations that carry data corresponding to the associated MBS. In other embodiments, multiple SPS configurations are configured for transmission of the same transport block for a unicast service. These SPS configurations have the same periodicity and each SPS configuration is activated by control information having a TCI state. Thus, each SPS configuration may have a different TCI state. Upon activation, the transmission opportunities of these SPS configurations may have different time domain resources.

In some embodiments, the network may indicate that the SPS configuration is for a first (or initial) transmission of a transport block. For other SPS configurations, the PDSCH transmitted at a transmission opportunity subsequent to and temporally adjacent to the transmission opportunity of the indicated SPS configuration (i.e., indicated as the first or initial transmission) carries the same transport block as the PDSCH transmitted at the transmission opportunity of the indicated SPS configuration.

For multiple PDSCH carrying the same transport block, the UE transmits HARQ-ACK feedback corresponding to only one of the multiple PDSCH. Here, the network may indicate whether the UE needs to transmit HARQ-ACK feedback of PDSCH for SPS configuration via Radio Resource Control (RRC) signaling, medium access Control (Medium Access Control, MAC) Control Element (CE), or activate DCI.

In one example, a physical uplink control channel (Physical uplink control channel, PUCCH) resource indicator field in the activation DCI may be used to indicate whether the UE transmits HARQ-ACK feedback that activates the DCI-activated SPS PDSCH. The values in the PUCCH resource indicator field are all 1, which indicates that the UE should transmit HARQ-ACK feedback, and the values in the PUCCH resource indicator field are all 0, which indicates that the UE should not transmit HARQ-ACK feedback. In another example, the network indicates that only one of the plurality of SPS configurations includes PUCCH resources for HARQ-ACK feedback, while the other SPS configurations do not include PUCCH resources for that purpose. In this case, the UE transmits HARQ-ACK feedback for the SPS configured PDSCH using only the configured PUCCH resources.

FIG. 4 illustrates one example of multiple SPS configurations. As shown in the figure, there are four SPS configurations, labeled SPS 0, SPS 1, SPS 2, and SPS 3. These four SPS configurations have the same period P. These four SPS are associated with a common MBS or are used for unicast services. In this example, SPS 0 is activated by DCI 0 having TCI state 0, PDSCH is transmitted using TCI state 0 at occasions 0A, 0B and 0C. Similarly, as PDSCH is transmitted using TCI state 1 at occasions 1A, 1B, and 1C, SPS 1 is activated by DCI 1 with TCI state 1; with PDSCH transmitted using TCI state 2 at occasions 2A, 2B, and 2C, SPS 2 is activated by DCI 2 with TCI state 2; as PDSCH is transmitted using TCI state 3 at occasions 3A, 3B and 3C, SPS 3 is activated by DCI 3 with TCI state 3.

In this example, the network indicates that SPS 0 is used for the first transmission of a transport block. Thus, the PDSCH transmitted on occasion 0A carries one transport block and this is the first transport of that transport block. For SPS 1, SPS 2, and SPS 3, the transmission occasions after occasion 0A and temporally adjacent to occasion 0A are occasions 1A, 2A, 3A, respectively. Thus, PDSCH transmitted at occasions 1A, 2A and 3A carry the same transport block. Similarly, PDSCH transmitted at occasions 0B, 1B, 2B and 3B carries the same transport block as the first transmission at occasion 0B, and PDSCH transmitted at occasions 0C, 1C, 2C and 3C carries the same transport block as the first transmission at occasion 0C.

The network may instruct the UE to transmit HARQ-ACK feedback only for PDSCH of SPS 1. Thus, the UE only transmits HARQ-ACK feedback for PDSCH transmitted on occasions 0A, 0B, and 0C. For other PDSCH, the UE does not send HARQ-ACK feedback.

Example 4

In some embodiments, a transmission window may be used to determine and/or configure transmissions. In these cases, PDSCH transmitted in the transmission window carries the same transport block. The beginning of the transmission window is the first symbol of the PDSCH carrying the first transmission of the transport block or the beginning of the slot of the PDSCH carrying the first transmission of the transport block. The end of the transmission window is the symbol preceding the first symbol of the PDSCH carrying the first transmission of the next transport block or the end of the slot preceding the slot of the PDSCH carrying the first transmission of the next transport block. This enables the transmission window to indicate a transmission period. Furthermore, transmitting the same transport block in the same transmission window enables the receiver to combine multiple copies of the transport block to improve decoding performance.

Fig. 5 shows one example of SPS transmissions using a transmission window. PDSCH transmitted on occasion 1 and occasion 2 carries the same transport block and the first transmission is on occasion 1. Similarly, PDSCH transmitted on occasions 3 and 4 carries another transport block and the first transmission is on occasion 3. Thus, the starting limit of the first transmission window (e.g., window 1 in fig. 5) is the start of opportunity 1 and the ending limit is the start of opportunity 3 as shown in fig. 5. The architecture applies similarly to window 3 and window 4 shown in fig. 5.

In some embodiments, the DCI schedules the PDSCH carrying the MBS retransmission (as shown in the upper right part of fig. 5), the DCI or the scheduled PDSCH is in the first transmission window, and the previous transmission is an SPS transmission. The field in the DCI is configured to indicate a corresponding window of a previous transmission. That is, the DCI schedules the PDSCH carrying a retransmission of a particular transport block, and a field in the DCI provides an indication of the transport window of the original transport block to which the retransmission corresponds.

In one example, a value of "0" in the DCI field indicates that the previous transmission and retransmission are both in the first transmission window. In the case of fig. 5, DCI of PDSCH scheduling retransmission carrying MBS is in window 4 and a value of "0" in DCI field indicates that the previous transmission is also in the window, i.e. in window 4. In another example, a value of "1" in the DCI field indicates that a previous transmission is in a transmission window preceding the first transmission window. In the case of fig. 5, this means that the previous transmission was in window 3. Similarly, a value of "2" in the DCI field indicates that a second transmission window preceding the first transmission window includes a previous transmission, and so on. In the case of fig. 5, it indicates that the previous transmission was in window 2.

In some embodiments, the DCI field is a dedicated field. In other embodiments, existing fields in the DCI may be reconfigured to indicate the transmission window. In one example, a HARQ Process Number (HPN) field may be used to indicate a transmission window. In this example, for DCI scheduling a retransmission, where the previous transmission was an SPS transmission, the HARQ process number field is used to indicate the transmission window. But for DCI scheduling a transmission that is not a retransmission, where the previous transmission was an SPS transmission, the HARQ process number field is used to indicate the HARQ process number as expected. Note that each transmission window is associated with its own different HPN, as will be described in the next embodiment.

In some embodiments, the beginning of the transmission window is the first symbol of the PDSCH carrying the first transmission of a transport block or the beginning of the slot of the PDSCH carrying the first transmission of a transport block and the end of the transmission window is the last symbol of the PDSCH carrying the last transmission of the same transport block or the end of the slot of the PDSCH carrying the last transmission of the same transport block.

In some embodiments, the transmission window is configured by the network. In one example, the starting point and/or duration is configured in units of milliseconds, symbols, sub-slots, subframes, frames, and the like. The transmission window is continuous in the time domain. The start point indicates the start of the first transmission window.

Example 5

In some embodiments, PDSCH carrying the same transport block within the same transmission window (e.g., PDSCH 1 and PDSCH 2 in window 1 as shown in fig. 5) have the same HARQ Process Number (HPN). For PDSCH carrying a transport block, HARQ Process number (or HARQ Process sequence (HARQ Process Identity, HARQ Process ID)) is determined based on the first or last transmission occasion for transmitting the same transport block. In this example, the HARQ process number of PDSCH is determined using the following equation:

HARQ Process ID＝[floor(CURRENT_slot×10/(numberOfSlotsPerFrame×periodicity×N))]modulo nrofHARQ-Processes

wherein, current_slot is the slot number of PDSCH occasion; number ofslotsperframe is the number of slots in each system frame; the periodicity is the period of the SPS transmission; n is the number of TCI states configured for MBS transmission or the number of transmission opportunities within a transmission window, or is configured by the network through RRC signaling, MAC CE or control information; nrofHARQ-Processes is the number of HARQ Processes.

Fig. 6 shows one example of SPS transmissions, where PDSCH 1 is the first transmission of a transport block and PDSCH 2, PDSCH 3, and PDSCH 4 carry the same transport block. For PDSCH 1, the HARQ process number is determined from its PDSCH resources and may be determined to be 0. For PDSCH 2, since PDSCH 1 is the first transmission of the transport block carried by PDSCH 2, the HARQ process number is determined based on PDSCH 1 resources. Therefore, the HARQ process number of PDSCH 2 is also 0. Similarly, the HARQ process numbers of PDSCH 3 and PDSCH 4 are also 0.

Example 6

In some embodiments, SPS is associated with MBS. DCI activating and deactivating SPS may be received (or detected) by more than one UE. This DCI is referred to as group common DCI, and the SPS configuration may be configured with a specific Radio Network Temporary Identifier (RNTI). Thus, a group common DCI with a Cyclic Redundancy Check (CRC) scrambled by a specific RNTI is used to activate or deactivate SPS configuration. The RNTI is used to indicate (or identify) a group common DCI activated or deactivated SPS configuration.

In one example, the first SPS is associated with MBS 1, and RNTI 1 is configured for the first SPS or MBS 1; the second SPS is associated with MBS 2 and RNTI 2 is configured for the second SPS or MBS 2; the third SPS is associated with MBS 3 and RNTI 3 is configured for the third SPS or MBS 3. The second SPS is activated when the UE receives the activation DCI with CRC scrambled by RNTI 2. When the UE receives the deactivation DCI with CRC scrambled by RNTI 3, the third SPS is deactivated.

In some embodiments, DCI activating and deactivating SPS may be received (or detected) by only one UE. The DCI is referred to as UE-specific DCI, and a HARQ process number field in the UE-specific DCI is used to indicate (or identify) SPS configuration that the UE-specific DCI activates or deactivates. In one example, the HARQ process number field in the UE-specific DCI indicates the SPS index. For the UE, the network configures the association between SPS index and RNTI or the association between SPS index and MBS through RRC signaling, MAC CE or DCI. Based on the association, when the UE receives the UE-specific DCI, the corresponding SPS transmission is activated or deactivated.

Continuing with the above example, UE 1 may receive only MBS 1 and MBS 3. The network configures SPS index 1 to be associated with RNTI 1 and SPS index 2 to be associated with RNTI 3. When UE 1 receives UE-specific activation DCI with a HARQ process number field indicating SPS index 2, then a third SPS is activated based on the association. When UE 1 receives UE-specific deactivation DCI with a HARQ process number field indicating SPS index 1, then the first SPS is deactivated based on the association.

Example 7

In some embodiments, the SPS configuration may be configured by the network to be associated with multiple MBS. The network may also configure an association between the SPS transmit opportunity and the MBS, wherein the SPS transmit opportunity is associated with one of the MBS. This results in the transmission of MBS data on the associated SPS transmit occasion.

In one example, the network may configure a transmission mode that includes multiple MBS and multiple SPS transmission opportunities such that a first MBS is associated with a first SPS transmission opportunity, a second MBS is associated with a second SPS transmission opportunity, and so on. The transmission pattern repeats in the time domain starting from the first transmission occasion.

Fig. 7 shows an example of SPS transmissions supporting multiple MBS. As shown in the figure, SPS with four transmission occasions are associated with three MBS (labeled MBS a, MBS B, and MBS C), such that a first occasion is associated with MBS a, a second occasion is associated with MBS B, a third occasion is associated with MBS a, and a fourth occasion is associated with MBS C. Thus, MBS A is sent on SPS occasion 1, MBS B is sent on SPS occasion 2, MBS A is sent on SPS occasion 3, MBS C is sent on SPS occasion 4, MBS A is sent on SPS occasion 5, MBS B is sent on SPS occasion 6, and so on.

In some embodiments, for a plurality of MBs associated with an SPS, each MBs is configured with a first scrambling ID, which results in the PDSCH carrying the MBs being scrambled with the configured first scrambling ID. Furthermore, each MBS may be configured with a demodulation reference signal (Demodulation Reference Signal, DMRS) sequence, wherein the network configures a second scrambling ID for PDSCH DMRS of that MBS. In one example, the second scrambling ID may be used for PDSCH DMRS sequence generation. In another example, the MBS is transmitted with a configured DMRS sequence. When the UE receives the SPS transmission, it determines (or identifies) the received MBS based on the scrambling ID or DMRS sequence.

In one example, MBS A and MBS B are associated with SPS 1. The PDSCH of SPS 1 may carry data for MBS a and MBS B. PDSCH scrambling ID X is configured for MBS a and PDSCH scrambling ID Y is configured for MBS B. If the PDSCH of SPS 1 carries the data of MBS A, the PDSCH is scrambled by a scrambling ID X; if the PDSCH of SPS 1 carries the data of MBS B, the PDSCH is scrambled by scrambling ID Y. When the UE receives the PDSCH of SPS 1 and can successfully decode the PDSCH with scrambling ID X, it may determine that the data carried by the PDSCH is for MBS a. If the UE successfully decodes the PDSCH with the scrambling ID Y, it may determine that the data carried by the PDSCH is for MBS B.

In another example, DMRS sequence 1 (or scrambling ID M) is configured for MBS a, and DMRS sequence 2 (or scrambling ID N) is configured for MBS B. If the PDSCH of SPS 1 carries MBS A data, sequence 1 is used for PDSCH DMRS (or PDSCH DMRS sequence is generated based on scrambling ID M). If the PDSCH of SPS 1 carries MBS B data, sequence 2 is used for PDSCH DMRS (or PDSCH DMRS sequence is generated based on scrambling ID N). The UE receives PDSCH of SPS 1. If the UE detects that the PDSCH DMRS sequence is sequence 1 (or PDSCH DMRS is scrambled by the scrambling ID M), it can be determined that the data carried by the PDSCH is for MBS a. If the UE detects that the PDSCH DMRS sequence is sequence 2 (or PDSCH DMRS is scrambled by scrambling ID N), it can be determined that the data carried by PDSCH is for MBS B.

Exemplary methods of the disclosed technology

Embodiments of the disclosed technology include, among other features and benefits, the following methods and techniques provide a technical solution to the problem of an SPS configuration in existing systems being unable to support multiple beams.

SPS PDSCH is transmitted for MBS services in different beams

(a) The association between the TCI state and PDSCH transmission occasions is configured. PDSCH is transmitted at a certain occasion by using the associated TCI state.

(b) Multiple SPS having the same period for SPS PDSCH are associated with MBS services. Each SPS is configured with a TCI state.

(c) SPS transmissions having different beams carry the same transport block.

Indication of previous transmission in SPS transmission

(a) A field in the DCI in which the retransmission is scheduled indicates a transmission window in which a previous transmission was transmitted.

(b) SPS transmissions carrying the same transport block have the same HPN and the HPN is determined based on SPS transmit occasions of the first or last transmission of the transport block. This previous transfer is indicated by the HPN.

3. SPS is associated with multiple MBS

(a) Each SPS opportunity is associated with an MBS and MBS data is transmitted on the associated SPS opportunity.

(b) Each MBS is configured with a scrambling ID for PDSCH or PDSCH DMRS sequences. The UE determines MBS according to the scrambling ID or PDSCH DMR.

Fig. 8A illustrates an example of a method 800 of wireless communication, the method 800 of wireless communication for scheduling network communication services using Semi-persistent scheduling (Semi-Persistent Scheduling, SPS) in a mobile communication technology. The method 800 includes: at operation 802, a network node configures one or more semi-persistent scheduling configurations having a plurality of beams.

The method 800 includes: based on the configuration, data is transmitted over the plurality of beams to at least one wireless device in a cell served by the network node using the one or more semi-persistent scheduling configurations, operation 804.

Fig. 8B illustrates another example of a method 850 of wireless communication, the method 850 of wireless communication being used to schedule network communication services using Semi-persistent scheduling (Semi-Persistent Scheduling, SPS) in a mobile communication technology. The method 850 includes: in operation 852, the wireless device receives data configured on one of the plurality of beams using one or more semi-persistent scheduling configurations from a network node.

The method 850 includes: in response to the receiving, an acknowledgement feedback message is sent, operation 854.

In some embodiments, one or more semi-persistent scheduling configurations are associated with a semi-persistent scheduling (semi-persistent scheduling, SPS) physical downlink shared channel (physical downlink shared channel, PDSCH) carrying a unicast service or at least one multicast service, including at least one multicast and broadcast service (multicast and broadcast service, MBS).

In some embodiments, SPS configurations are used to transmit data from a single multicast and broadcast service over multiple beams to multiple wireless devices served by a network node.

In some embodiments, the SPS configuration includes a plurality of PDSCH transmission occasions, and the network node is further configured to, for each PDSCH transmission occasion of the plurality of PDSCH transmission occasions, configure an association between the respective PDSCH transmission occasion and a respective transmission configuration indicator (Transmission Configuration Indicator, TCI) state.

In some embodiments, the wireless device is configured to receive an indication from the network node indicating the TCI state, and the wireless device is further configured to send an acknowledgement feedback message for the PDSCH transmission occasion corresponding to the indicated TCI state.

In some embodiments, multiple SPS transmissions using SPS configuration are associated with a single MBS, each SPS transmission of the multiple SPS transmissions including a common period and configured with a transmission configuration indicator (Transmission Configuration Indicator, TCI) state.

In some embodiments, the TCI state includes a downlink reference signal (Downlink Reference Signal, DL-RS) and corresponding Quasi Co-Location (QCL) parameters.

In some embodiments, the DL-RS includes a channel state information reference signal (Channel State Information Reference Signal, CSI-RS) or synchronization signal and physical broadcast channel (Synchronization Signal And Physical Broadcast Channel, SS/PBCH) block.

In some embodiments, the SPS configuration includes a plurality of PDSCH transmission occasions, the data transmitted on each of the plurality of beams in each of the plurality of PDSCH transmission occasions including a common transport block.

In some embodiments, the SPS configuration includes a plurality of PDSCH transmission opportunities in a first transmission window.

In some embodiments, the data transmitted on each PDSCH transmission occasion of the plurality of PDSCH transmission occasions in the first transmission window comprises a common transport block.

In some embodiments, the wireless device is configured to receive downlink control information (Downlink Control Information, DCI) including an indication of retransmission of data of the MBS.

In some embodiments, the indication indicates a time position of the first transmission window relative to a second transmission window, the second transmission window including PDSCH transmission occasions carrying retransmissions of data.

In some embodiments, each PDSCH transmission occasion of the plurality of PDSCH transmission occasions in the first transmission window is associated with a common value of a hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) process number field.

In some embodiments, the value of the HARQ Process Number (HPN) field is determined based on a first PDSCH transmission occasion or a last PDSCH transmission occasion of the plurality of PDSCH transmission occasions in the first transmission window.

In some embodiments, the value of HPN is based on the current slot index of PDSCH transmission occasions, the number of slots per frame, the periodicity of SPS transmissions, the number of transmission configuration indicator (Transmission Configuration Indicator, TCI) states configured for MBS, and the number of HARQ processes.

In some embodiments, data from multiple MBS is transmitted in multiple beams through SPS PDSCH to multiple wireless devices served by a network node.

In some embodiments, each MBS of the plurality of MBS is configured with a scrambling identity or demodulation reference signal (Demodulation Reference Signal, DMRS) for the PDSCH.

In some embodiments, the wireless device is configured to identify the MBS based on a corresponding scrambling identification of the PDSCH or a corresponding DMRS.

Embodiments of the disclosed technology

Fig. 9 is a block diagram of a portion of an apparatus in accordance with some embodiments of the presently disclosed technology. An apparatus 905, such as a base station or a wireless device (or UE), may comprise processor electronics 910, such as a microprocessor, that implements one or more of the techniques presented in this document. The apparatus 905 may include transceiver electronics 915 to transmit and/or receive wireless signals over one or more communication interfaces, such as an antenna(s) 920. The apparatus 905 may include other communication interfaces for transmitting and receiving data. The apparatus 905 may include one or more memories (not explicitly shown) configured to store information such as data and/or instructions. In some implementations, the processor electronics 910 may include at least a portion of the transceiver electronics 915. In some embodiments, at least some of the disclosed techniques, modules, or functions are implemented using the apparatus 905.

Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product embodied in a computer-readable medium, the computer program product including computer-executable instructions, such as program code, executed by computers in network environments. The computer readable medium may include removable and non-removable storage devices including, but not limited to, read Only Memory (ROM), random access Memory (Random Access Memory, RAM), compact Discs (CDs), digital Versatile Discs (DVDs), etc. Thus, the computer readable medium may include a non-transitory storage medium. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer or processor executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

Some of the disclosed embodiments may be implemented as a device or module using hardware circuitry, software, or a combination thereof. For example, a hardware circuit implementation may include discrete analog and/or digital components, for example, integrated as part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application specific integrated circuits (Application Specific Integrated Circuit, ASIC) and/or field programmable gate array (Field Programmable Gate Array, FPGA) devices. Some implementations may additionally or alternatively include a digital signal processor (Digital Signal Processor, DSP) that is a special purpose microprocessor having an architecture optimized for the operational requirements of digital signal processing associated with the disclosed functionality of the present application. Similarly, the various components or sub-components within each module may be implemented in software, hardware, or firmware. The modules and/or connections between components within the modules may be provided using any of the connection methods and mediums known in the art, including but not limited to communications over the internet, wired or wireless networks using appropriate protocols.

While this document contains many specifics, these should not be construed as limitations on the scope of the claimed invention or of what may be claimed, but rather as descriptions of features specific to particular embodiments. In this document, certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Vice versa, various features described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination. Similarly, although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.

Only a few implementations and examples have been described in this disclosure, and other implementations, modifications, and variations are possible in light of the above description and illustration of this disclosure.

Claims

1. A method of wireless communication, comprising:

the network node configures one or more semi-persistent scheduling configurations having a plurality of beams; and

based on the configuration, data is transmitted over the plurality of beams to at least one wireless device in a cell served by the network node using the one or more semi-persistent scheduling configurations.

2. A method of wireless communication, comprising:

the wireless device receives, from a network node, data configured on one of a plurality of beams using one or more semi-persistent scheduling configurations; and

an acknowledgement feedback message is sent in response to the receiving.

3. The method of claim 1 or 2, wherein the one or more semi-persistent scheduling configurations are associated with a semi-persistent scheduling, SPS, physical downlink shared channel, PDSCH, carrying a unicast service or at least one multicast service; wherein the at least one multicast service comprises at least one multicast and broadcast service, MBS.

4. The method of claim 3, wherein the SPS configuration is used to transmit data from a single MBS over the plurality of beams to a plurality of wireless devices served by the network node.

5. The method of claim 4, wherein the SPS configuration comprises a plurality of PDSCH transmission opportunities; and the network node is further configured to, for each PDSCH transmission occasion of the plurality of PDSCH transmission occasions, configure an association between the respective PDSCH transmission occasion and the respective transmission configuration indicator TCI state.

6. The method of claim 5, wherein the wireless device is configured to receive an indication from the network node indicating TCI status; and the wireless device is further configured to send the acknowledgement feedback message for a PDSCH transmission occasion corresponding to the indicated TCI state.

7. The method of claim 4, wherein a plurality of SPS transmissions using the SPS configuration are associated with a single MBS; wherein each SPS transmission of the plurality of SPS transmissions includes a common period and is configured with a transmission configuration indicator, TCI, state.

8. The method of any of claims 5 to 7, wherein the TCI state comprises a downlink reference signal DL-RS and corresponding quasi co-located QCL parameters.

9. The method of claim 8, wherein the DL-RS comprises a channel state information reference signal CSI-RS or a synchronization signal and a physical broadcast channel SS/PBCH block.

10. The method of claim 4, wherein the SPS configuration comprises a plurality of PDSCH transmission opportunities; wherein the data transmitted on each of the plurality of beams in each of the plurality of PDSCH transmission occasions comprises a common transport block.

11. The method of claim 3, wherein the SPS configuration comprises a plurality of PDSCH transmission opportunities in a first transmission window.

12. The method of claim 11, wherein the data transmitted on each PDSCH transmission occasion of the plurality of PDSCH transmission occasions in the first transmission window comprises a common transport block.

13. The method of claim 11, wherein the wireless device is configured to receive downlink control information, DCI, comprising an indication of retransmission of data of the MBS.

14. The method of claim 13, wherein the indication indicates a temporal position of the first transmission window relative to a second transmission window; wherein the second transmission window includes PDSCH transmission occasions carrying the retransmission of the data.

15. The method of claim 11, wherein each PDSCH transmission occasion of the plurality of PDSCH transmission occasions in the first transmission window is associated with a common value of a hybrid automatic repeat request, HARQ, process number field.

16. The method of claim 15, wherein a value of the HARQ process number HPN field is determined based on a first PDSCH transmission occasion or a last PDSCH transmission occasion of the plurality of PDSCH transmission occasions in the first transmission window.

17. The method of claim 15 or 16, wherein the value of the HPN is based on a current slot index of a PDSCH transmission occasion, a number of slots per frame, a period of SPS transmissions, a number of transmission configuration indicator, TCI, states configured for the MBS, and a number of HARQ processes.

18. The method of claim 3, wherein data from a plurality of MBS is transmitted in the plurality of beams through the SPS PDSCH to a plurality of wireless devices served by the network node.

19. The method of claim 18, wherein each MBS of the plurality of MBS is configured with a demodulation reference signal, DMRS, or a scrambling identity for the PDSCH.

20. The method of claim 19, wherein the wireless device is configured to identify MBS based on the corresponding scrambling identification or the corresponding DMRS for the PDSCH.

21. A wireless communication device comprising a processor and a memory, wherein the processor is configured to read codes from the memory and implement the method of any one of claims 1 to 20.

22. A computer program product comprising computer readable program medium code stored thereon, which when executed by a processor causes the processor to implement the method of any of claims 1 to 20.