Apparatus and method for operating according to time division duplex mode

Abstract

The present disclosure relates to apparatuses and methods for operating according to time division duplex modes. According to one example aspect of the present disclosure, a method is provided that includes receiving, by an apparatus, a first system information block (SIB) and a second SIB; determining, by the apparatus, a default time division duplex (TDD) mode based on the first SIB and a plurality of additional TDD modes based on the second SIB; operating, by the apparatus, according to the default TDD mode; determining, by the apparatus, at least one monitoring occasion for monitoring a group common downlink control information (DCI) based on the second SIB; and determining, by the apparatus, whether to operate according to one of the plurality of additional TDD modes based on whether the group common DCI is received during the at least one monitoring occasion.

Description

Technical Field

[0001] Various example embodiments generally relate to Time Division Duplex (TDD) mode, and more specifically, to operation according to such mode, for example, in cellular communication networks. Background Technology

[0002] In cellular communication networks, User Equipment (UE) can operate in Time Division Duplex (TDD) mode. The assumption behind TDD operation is that the involved device (such as the UE) operates according to the half-duplex principle: at any given time, the involved device can either transmit or receive (i.e., it cannot transmit and receive simultaneously). The rules defined for TDD can also be applied to Frequency Division Duplex (FDD) scenarios, for example, for low-cost UEs without duplex filters and operating according to half-duplex rules. When a UE operates in TDD mode, it is in receive mode when the radio network node is transmitting, and in transmit mode when the radio network node is receiving. TDD mode can be applied to various cellular communication networks, such as those based on 5G radio access technology. 5G radio access technology can also be referred to as New Radio (NR) access technology. The 3GPP (3rd Generation Partnership Project) develops standards for 5G / NR and future radio access technologies, thus requiring enhancements related to TDD. Summary of the Invention

[0003] The subject matter of the independent claims is provided for several aspects. Some exemplary embodiments are defined in the dependent claims.

[0004] The scope of protection sought by the various exemplary embodiments of this disclosure is defined by the independent claims. Exemplary embodiments and features (if any) described in this specification that do not fall within the scope of the independent claims should be interpreted as examples that aid in understanding the various exemplary embodiments of this disclosure.

[0005] According to one aspect of this disclosure, an apparatus is provided, comprising: at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: receive a first System Information Block (SIB) and a second SIB; determine a default Time Division Duplex (TDD) mode based on the first SIB and determine a plurality of additional TDD modes based on the second SIB; operate according to the default TDD mode; determine, based on the second SIB, at least one monitoring opportunity for monitoring Group Common Downlink Control Information (DCI); and determine, based on whether the Group Common DCI is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes. The apparatus may be a user equipment or a control device configured to control its functions when installed therein.

[0006] According to one aspect of this disclosure, an apparatus is provided, including at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: determine a default Time Division Duplex (TDD) mode and a plurality of additional TDD modes; operate according to the default TDD mode; determine a monitoring configuration having at least one monitoring opportunity for monitoring a Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is adapted to a TDD configuration; determine a repetition configuration of the plurality of additional TDD modes, wherein the repetition configuration includes at least one repetition number; monitor the PDCCH according to the monitoring configuration; and determine, based on whether the PDCCH is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes according to the at least one repetition number.

[0007] According to one aspect, a method is provided, the method comprising: receiving a first System Information Block (SIB) and a second SIB by a device; determining a default Time Division Duplex (TDD) mode based on the first SIB and determining a plurality of additional TDD modes based on the second SIB; operating the device according to the default TDD mode; determining, based on the second SIB, at least one monitoring opportunity for monitoring Group Common Downlink Control Information (DCI); and determining, based on whether the Group Common DCI is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes. The device may be a user equipment or a control device configured to control its functions when installed therein.

[0008] According to one aspect of this disclosure, a method is provided, comprising: determining a default Time Division Duplex (TDD) mode and a plurality of additional TDD modes by means of an apparatus; operating the apparatus according to the default TDD mode; determining a monitoring configuration having at least one monitoring opportunity for monitoring a Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is adapted to a TDD configuration; determining a repetition configuration of the plurality of additional TDD modes by means of the apparatus, wherein the repetition configuration includes at least one repetition number; monitoring the PDCCH by means of the apparatus according to the monitoring configuration; and determining, based on whether the PDCCH is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes according to the at least one repetition number by means of the apparatus. The apparatus may be a user equipment or a control device configured to control its functions when installed therein.

[0009] According to one aspect of this disclosure, an apparatus is provided comprising components for: receiving a first System Information Block (SIB) and a second SIB; determining a default Time Division Duplex (TDD) mode based on the first SIB and determining a plurality of additional TDD modes based on the second SIB; operating according to the default TDD mode; determining, based on the second SIB, at least one monitoring opportunity for monitoring Group Common Downlink Control Information (DCI); and determining, based on whether the Group Common DCI is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes. The apparatus may be a user equipment or a control device configured to control its functions when installed therein.

[0010] According to one aspect of this disclosure, an apparatus is provided comprising components for: determining a default Time Division Duplex (TDD) mode and a plurality of additional TDD modes; operating according to the default TDD mode; determining a monitoring configuration having at least one monitoring opportunity for monitoring the Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is adapted to a TDD configuration; determining a repetition configuration of the plurality of additional TDD modes, wherein the repetition configuration includes at least one repetition number; monitoring the PDCCH according to the monitoring configuration; and determining, based on whether the apparatus is to operate according to one of the plurality of additional TDD modes, according to the at least one repetition number, whether the operation is to be performed according to one of the additional TDD modes, based on whether the PDCCH is received during the at least one monitoring opportunity. The apparatus may be a user equipment or a control device configured to control its functions when installed therein.

[0011] According to one aspect of this disclosure, a computer program is provided, comprising instructions that, when executed by a device, cause the device to: receive a first System Information Block (SIB) and a second SIB; determine a default Time Division Duplex (TDD) mode based on the first SIB and determine a plurality of additional TDD modes based on the second SIB; operate according to the default TDD mode; determine, based on the second SIB, at least one monitoring opportunity for monitoring Group Common Downlink Control Information (DCI); and determine, based on whether the Group Common DCI is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes. The device may be a user equipment or a control device configured to control its functions when installed therein.

[0012] According to one aspect of this disclosure, a computer program is provided, comprising instructions that, when executed by an apparatus, cause the apparatus to: determine a default Time Division Duplex (TDD) mode and a plurality of additional TDD modes; operate according to the default TDD mode; determine a monitoring configuration having at least one monitoring opportunity for monitoring the Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is adapted to a TDD configuration; determine a repetition configuration of the plurality of additional TDD modes, wherein the repetition configuration includes at least one repetition number; monitor the PDCCH according to the monitoring configuration; and determine, based on whether the apparatus is to operate according to one of the plurality of additional TDD modes, according to the at least one repetition number, whether the PDCCH is received during the at least one monitoring opportunity. The apparatus may be a user equipment or a control device configured to control its functions when installed therein.

[0013] According to one aspect of this disclosure, a non-transitory computer-readable medium is provided, having stored thereon a computer-readable instruction set that, when executed by at least one processor, causes a device to at least: receive a first System Information Block (SIB) and a second SIB; determine a default Time Division Duplex (TDD) mode based on the first SIB and determine a plurality of additional TDD modes based on the second SIB; operate according to the default TDD mode; determine, based on the second SIB, at least one monitoring opportunity for monitoring Group Common Downlink Control Information (DCI); and determine, based on whether the Group Common DCI is received during the at least one monitoring opportunity, whether to operate according to one of the plurality of additional TDD modes. The device may be a user equipment or a control device configured to control its functions when installed therein.

[0014] According to one aspect of this disclosure, a non-transitory computer-readable medium is provided, on which a computer-readable instruction set is stored, which, when executed by at least one processor, causes a device to at least: determine a default Time Division Duplex (TDD) mode and a plurality of additional TDD modes; operate according to the default TDD mode; determine a monitoring configuration having at least one monitoring opportunity for monitoring the Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is adapted to a TDD configuration; determine a repetition configuration of the plurality of additional TDD modes, wherein the repetition configuration includes at least one repetition number; monitor the PDCCH according to the monitoring configuration; and determine, based on whether the device is to operate according to one of the plurality of additional TDD modes, according to the at least one repetition number, whether the device is to operate according to one of the plurality of additional TDD modes, based on whether the PDCCH is received during the at least one monitoring opportunity. The device may be a user equipment or a control device configured to control its functions when installed therein. Attached Figure Description

[0015] Figure 1 Examples of network scenarios according to at least some example embodiments are shown;

[0016] Figure 2 Examples of dynamic TDD patterns according to at least some example embodiments are shown;

[0017] Figure 3 Examples of TDD configuration adaptation according to at least some example embodiments are shown;

[0018] Figure 3a Showing more details Figure 3 The first part;

[0019] Figure 3b Showing more details Figure 3 Part Two;

[0020] Figure 4 Signaling diagrams according to at least some example embodiments are shown;

[0021] Figure 5 An example apparatus capable of supporting at least some of the example embodiments is shown;

[0022] Figure 6 A flowchart of a first method according to at least some example embodiments is shown;

[0023] Figure 7 A flowchart of a second method according to at least some example embodiments is shown. Detailed Implementation

[0024] Embodiments of this disclosure provide enhancements for operation in Time Division Duplex (TDD) mode. More specifically, embodiments of this disclosure enable dynamic selection of the TDD mode to be used without incurring unnecessary signaling overhead and significant memory consumption. The radio network node can first indicate a default TDD mode and multiple additional TDD modes to the user equipment (UE). The UE can then begin operation according to the default TDD mode. Subsequently, the radio network node can use Group Common Downlink Control Information (DCI) to instruct the UE that it should begin operation according to one of the multiple additional TDD modes. Therefore, depending on whether the Group Common DCI has been received, the UE can determine whether to begin operation according to one of the multiple additional TDD modes. It should be noted that the radio network node may have previously transmitted the Group Common DCI and System Information Block (SIB).

[0025] Therefore, unnecessary signaling can be avoided because the radio network node does not need to send group common DCI if the UE does not need to switch to using one of the multiple additional TDD modes. The UE may need to store the TDD mode in its memory, but in any case, the significant memory consumption at the UE can be avoided, at least compared to the solution in 5G / NR.

[0026] Additionally, rules can be provided to the UE to define how the UE should operate when there is no Group Common DCI (i.e., when no Group Common DCI is received by the UE during the monitoring period). Such rules are needed in both cases where the radio network node does not send a Group Common DCI and cases where the radio network node sends a Group Common DCI but the UE does not receive it correctly. Even if UE 110 is not part of the Dynamic TDD mode adaptation, the corresponding rules can still be applied to flexible resources; however, in such cases, UE 110 may not be configured to monitor Group Common DCI.

[0027] Figure 1 Examples of network scenarios according to at least some example embodiments are shown. Figure 1 In an example scenario, there could be a beam-based wireless communication system comprising a UE 110, a wireless network node 120, and a core network 130. UE 110 can connect to the wireless network node 120 simultaneously or one at a time via the air interface using beam 115.

[0028] UE 110 may include, for example, smartphones, cellular phones, machine-to-machine (M2M) nodes, machine-type communication (MTC) nodes, Internet of Things (IoT) nodes, automotive telemetry units, laptops, tablets, or virtually any type of suitable wireless terminal, such as fixed wireless access nodes or relay nodes. Figure 1 In the example system, UE 110 can wirelessly communicate with wireless network node 120 via at least one beam 115. Wireless network node 120 can be regarded as a serving node for UE 110, and a cell of wireless network node 120 can be a serving cell for UE 110.

[0029] In some example embodiments, the network scenario may include a relay node, an alternative or additional location, a UE 110, and / or a wireless network node 120. A relay may be used, for example, when operating on millimeter-wave frequencies, or when operating on lower frequencies that at least include frequency range 1 FR1 and new frequency bands. One example of a relay node may be an Integrated Access and Backhaul (IAB) node. An IAB node may also be referred to as a self-backhaul relay. Another example of a relay may be an out-of-band relay. Typically, a relay node may include two parts: 1) The Distributed Unit (DU) portion facilitates the functionality of the wireless network node 120 (such as a gNB). The DU portion facilitates access links (also referred to as sub-links). Therefore, in some example embodiments, the relayed DU portion may be referred to as the wireless network node 120, and the DU may perform the tasks of the wireless network node 120; 2) The Mobile Termination (MT) portion facilitates the functionality of UE 110. The MT portion facilitates a backhaul link (also referred to as a parent link), which can be a communication link between a parent node (such as the DU portion of wireless network node 120) and a relay (such as an IAB node). In some example embodiments, the MT portion may be referred to as UE 110 and performs the tasks of UE 110.

[0030] The air interface between UE 110 and radio network node 120 can be configured according to a Radio Access Technology (RAT), and both UE 110 and radio network node 120 are configured to support that RAT. Examples of cellular RATs include Long Term Evolution (LTE), New Radio (NR), also known as 5G Radio Access Technology, 6G Radio Access Technology, and MulteFire. UE 110 and radio network node 120 can be part of a Radio Access Network (RAN).

[0031] For example, in the context of LTE, Radio Network Node 120 may be referred to as an eNB; while in the context of NR, Radio Network Node 120 may be referred to as a gNB. In some example embodiments, Radio Network Node 120 may be referred to as a Transmit / Receive Point (TRP), or may control multiple TRPs, which may be co-located or non-co-located. In any case, the example embodiments of this disclosure are not limited to any particular wireless technology. Rather, the example embodiments can be used in any wireless communication system where dynamic selection of TDD mode will need to be enabled.

[0032] Wireless network node 120 can connect directly to core network 130 via interface 125, or connect to core network 130 via at least one intermediate node. Core network 130 can then connect to another network (…) via interface 135. Figure 1 (Not shown in the image) Coupling, connectivity to other networks via this other network can be obtained, for example, via the Global System for Internet (GSI). Wireless network node 120 can be connected directly to core network 130 or another core network, or via at least one intermediate node. In some example embodiments, core network 130 may include core network nodes.

[0033] Embodiments of this disclosure enable coordination of link direction (DL and UL transmissions) between UE 110 and radio network node 120 when TDD is used. This coordination requires dynamic signaling, such as higher-layer signaling. Additionally, relevant UE behaviors need to be defined. More specifically, embodiments of this disclosure can be used for dynamic TDD frame structure adaptation, for example, for 6G scenarios such as network power saving (NES). Embodiments of this disclosure can also be used to improve 5G baselines, for example, avoiding excessive complexity introduced in 5G. 5G can also be referred to as New Radio (NR).

[0034] In NR, the time slot allocation principles are defined in Section 11.1 of the 3GPP TS 38.213 standard specification. In NR, time slot allocation is performed hierarchically by the following signals: 1. Cell-specific Radio Resource Control (RRC) configuration: TDD-UL-DL-ConfigurationCommon; • (Fixed) Periodic configuration of DL and UL slots / symbols (Mode 1, Mode 2). Depending on the configuration, it may be only Mode 1, or both Mode 1 and Mode 2; 2. UE-specific RRC configuration: TDD-UL-DL-ConfigurationDedicated; • Configuration of each time slot for DL ​​and UL symbols; • Define / override UL and DL symbols in time slots that are not defined as UL or DL ​​by periodic cell-specific configuration; 3. Physical Downlink Control Channel (PDCCH): DCI format 2_0 provides Slot Format Indication (SFI) (see TS38.213, Section 11.1.1); • Define / override UL and DL symbols in time slots where UL and DL are not defined by RRC (cell or UE-specific configuration). In addition to these three options, UL licensing can also convert the corresponding flexible resources to UL, and correspondingly convert DL licensing to DL.

[0035] Furthermore, in the case of NR, the corresponding RRC signaling is then defined in the 3GPP standard specification TS 38.331: • TDD-UL-DL-ConfigurationCommon is provided as a TDD-UL-DL-ConfigCommon information element; and • TDD-UL-DL-ConfigurationDedicated is provided as a TDD-UL-DL-ConfigDedicated information element.

[0036] In NR, time slots and / or symbols not defined as UL or DL ​​are considered flexible. Specific rules are defined for the following operations: (i) fixed UL / DL symbols defined by RRC; (ii) UL / DL symbols defined by dynamic SFI (DCI format 2_0); and (iii) flexible symbols. Flexible symbols can also be used to facilitate link direction switching for UE 110. Configuration can be done in various ways, for example, for symbols in full and partial time slots, or for symbols (covering symbols in full and partial time slots), where a full time slot contains a single resource type (DL or UL), while a partial time slot contains at least two resource types (DL, FL, UL).

[0037] However, in the NR context, dynamic SFI leads to various problems. For example, one issue is that DCI 2_0 involves a very significant RRC signaling burden (up to >1 Mbps / serving cell). Furthermore, the high number of modes, support for very long modes, and excessive configurability (per time slot) result in significant memory consumption at UE 110. In NR, the sheer number of combinations also hinders comprehensive UE testing. Therefore, at least for 6G, a more pragmatic solution is needed to replace the current NR framework, while smooth coexistence with NR is also a key requirement.

[0038] Therefore, embodiments of this disclosure enable dynamic selection of the TDD mode to be used. The radio network node 120 can send a first System Information Block (SIB), such as SIB1, and a second SIB, such as SIBx, to the UE 110. That is, the second SIB does not need to be SIB2; it can be any SIB (e.g., SIB24). The UE 110 can then determine a default TDD mode based on the first SIB and determine multiple additional TDD modes based on the second SIB. Afterward, the UE 110 can begin operation according to the default TDD mode. In other words, the UE 110 can switch between transmitting and receiving according to the default TDD mode.

[0039] A SIB can be sent to a UE by broadcasting an SIB from a wireless network node 120, where broadcasting includes transmissions not addressed to a specific receiving node. On the other hand, unicast transmissions can refer to transmissions addressed to a specific receiving node (e.g., UE 110).

[0040] UE 110 can further determine the monitoring timing for monitoring group common DCI based on the second SIB. Group common DCI can be used to deliver control information to more than one UE in a single DCI message (such as DCI format 2_0). That is, group common DCI can be designed to deliver control information to more than one UE in a single DCI message. During the monitoring timing, UE 110 can be configured to attempt to receive group common DCI transmissions by radio network node 120 (if such transmissions are performed). Group common DCI can be monitored according to a common search space type of PDCCH candidates with SIBx configuration (or predefined) and monitoring timing. The common search space can be associated with a control channel resource configuration applied to SIB1 reception (this can be referred to as CORESET0).

[0041] Depending on whether the radio network node 120 sends a group common DCI during the monitoring period, the UE 110 can determine whether to operate according to one of the plurality of additional TDD modes. For example, if the UE 110 receives a group common DCI during the monitoring period, the UE 110 can operate according to one of the plurality of additional TDD modes. The additional TDD mode can be indicated by the radio network node 120 in the group common DCI. Alternatively, if the UE 110 does not receive a group common DCI during the monitoring period, the UE 110 can operate according to the default TDD mode.

[0042] Alternatively or additionally, UE 110 may determine a default TDD mode and the plurality of additional TDD modes. UE 110 may then operate according to the default TDD mode. UE 110 may also determine a monitoring configuration having at least one monitoring period for monitoring the PDCCH, wherein the monitoring configuration is related to TDD configuration adaptation. That is, the monitoring configuration may include a configuration for TDD adaptation. UE 110 may also determine a repetition configuration of the plurality of additional TDD modes, wherein the repetition configuration includes at least one repetition number, and UE 110 monitors the PDCCH according to the monitoring configuration. Then, based on whether the PDCCH is received during at least one monitoring period, UE 110 may determine whether to operate according to one of the plurality of additional TDD modes, according to at least one repetition number.

[0043] In some example embodiments, mode adaptation may be associated with a predefined time period (e.g., a time period with a duration of N×P (or N×[P+P2]) and a predefined start time, such as the start of a radio frame). That is, UE 110 can, when configured, determine whether to operate according to one of the plurality of additional TDD modes within the predefined time period, and operate accordingly. One or more monitoring opportunities may be associated with a single predefined time period (e.g., NxP). Blind detection of group common DCIs can be a continuous process (for active UEs). That is, if UE 110 does not find a group common DCI within a time period, it can try again in the next time period.

[0044] In some example embodiments, the first SIB can be SIB1, and the second SIB can be another SIB, such as SIBx. Alternatively, the second SIB can be SIB1, and the first SIB can be another SIB. Alternatively, the first SIB and the second SIB can be the same. That is, the default TDD mode and the plurality of additional TDD modes can be indicated via the same SIB, but using different information elements (IEs).

[0045] In some example embodiments, TDD-UL-DL-ConfigurationCommon (i.e., cell-specific mode) can be used to configure the radio network node 120 for cell-specific modes with TDD UL / DL separation. However, multiple additional TDD modes can be configured by the radio network node 120 for the UE 110, rather than configuring the slot format separately for each slot of each slot format combination. For example, up to [ K A TDD mode can be defined based on a default TDD mode (such as mode 1 (or mode 1 + mode 2)). That is, multiple additional TDD modes can be constructed to be dynamically selected, for example, using the principles that can be used to define TDD-UL-DL-ConfigurationCommon.

[0046] In some example embodiments, UE 110 can determine the UL and DL symbols of the TDD default mode and one of the plurality of additional TDD modes based on the second SIB. UE 110 can also determine periods of no transmission or reception to allow time to change the link direction of the one of the plurality of additional TDD modes based on one of the following: • Option 1: UE 110 may determine some, but not all, of the flexible symbols of the default TDD mode as the time period of the multiple additional TDD modes. For example, DL and UL symbols may be indicated by radio network node 120. The remaining symbols may be treated as flexible symbols by UE 110, which may transmit or receive them during the flexible symbol period based on predefined rules. UE 110 may also be expected to perform link direction switching (both Rx→Tx and Tx→Rx during the flexible symbol period). • Option 2: UE 110 may determine the flexible symbols of the default TDD mode as the time periods of the multiple additional TDD modes. For example, the DL and UL symbols may be indicated by the radio network node 120. The remaining symbols may be considered as protection periods, during which UE 110 may neither transmit nor receive; • Option 3: UE 110 can determine the time period of the plurality of additional TDD modes based on the second SIB. For example, in addition to DL and UL symbols, radio network node 120 can also indicate the time period (symbol), while the remaining symbols can be considered flexible by UE 110.

[0047] In some example embodiments, a nested structure can be utilized, where the radio network node 120 can indicate to the UE 110 in a second SIB (SIBx) how the flexible symbols of the default TDD mode will be used in the case of the plurality of additional TDD modes. The UE 110 can then determine that the UL and DL symbols of the default TDD mode and the plurality of additional TDD modes are the same. The UE 110 can also determine, based on the second SIB, the flexible system using the TDD mode for each of the plurality of additional TDD modes. In some example embodiments, the radio network node 120 can adapt the flexible symbols and indicate those flexible symbols using TDD-UL-DL-ConfigurationCommon, but not the DL and UL symbols. In other words, the DL and UL symbols in TDD-UL-DL-ConfigurationCommon can remain DL and UL symbols after dynamic SFI adaptation; that is, the DL and UL symbols can be the same for the default TDD mode and for all of the plurality of additional TDD modes.

[0048] In some example embodiments, a mode extension framework may be employed. The radio network node 120 may send a repeat configuration of the plurality of additional TDD modes to the UE 110 in a second SIB (SIBx), wherein the repeat configuration may include at least one repeat number. The UE 110 may then determine the repeat configuration based on the second SIB and, when configured during a monitoring period, operate according to at least one repeat number. In some example embodiments, the radio network node 120 may send an indication to the UE 110 specifying at least one repeat number ( N ).For example, N=1 It can refer to a single pattern (without repetition). N=2 It can refer to a pattern plus a single repetition, and N=3 It can refer to a pattern plus two repetitions, and so on.

[0049] In some example embodiments, the UE 110 can operate by repeating one of the plurality of additional TDD modes according to the repeated configuration of the default TDD mode when configured during monitoring. That is, by default, the plurality of additional TDD modes to be selected can cover a mode of length P (or, in the case of using a two-part cascaded mode (such as 5G), the coverage length is P+P2).

[0050] In some example embodiments, the UE 110 can be configured during monitoring periods to repeat multiple additional TDD modes according to a set number of repetitions. That is, multiple additional TDD modes can exist. N A length of P (or P+P2 The repeated TDD mode, which forms the pattern selected by dynamic signaling. K [ ] TDD modes. In some example embodiments, in dynamic mode N After the N repetitions, if UE 110 receives a relevant indication (e.g., via group common DCI), UE 110 can fall back to using the default TDD mode, or fall back to the next dynamic indication among the plurality of additional TDD modes with N repetitions. Number of repetitions N It can be explicitly indicated using configuration change messages (Dynamic SFI), or N It can be part of the mode configuration.

[0051] In some example embodiments, UE 110 may be configured to operate by repeating multiple additional TDD modes during monitoring periods, wherein the number of repetitions is configured individually for each of the multiple additional TDD modes. That is, the extension may be part of the TDD mode configuration, and KA pattern can be obtained, making K × N A TDD mode is configured, instead of K One TDD mode is configured.

[0052] In some example embodiments, the length of the plurality of additional TDD modes may be the same as the length of the default TDD mode. Therefore, UE 110 can determine the length of the plurality of additional TDD modes, wherein the length of the plurality of additional TDD modes is the same as the length of the default TDD mode.

[0053] In some example embodiments, the plurality of additional TDD patterns based on the second SIB can also be based on the pattern of the first SIB. That is, the plurality of additional TDD patterns can be created based on the principle used for definition, which is the SIB1 pattern.

[0054] In some example embodiments, the periodicity of monitoring timing for group common DCI can be determined according to a pattern extension framework. For example, the periodicity of a monitoring configuration defined relative to a known reference (e.g., the start of a pattern) can be defined as... N .

[0055] Figure 2 Examples of dynamic TDD patterns according to at least some example embodiments are shown. Figure 2 In this code, the default TDD mode is represented by 210. Furthermore, the DL symbol for default mode 210 is represented by 212, the flexible symbol for default mode 210 is represented by 214, and the UL symbol for default mode 210 is represented by 216.

[0056] The first TDD mode among the multiple additional TDD modes is represented by 220. The DL symbol for the first TDD mode 220 is represented by 222, the flexible symbol for the first TDD mode 220 is represented by 224, and the UL symbol for the first TDD mode 220 is represented by 226. The second TDD mode among the multiple additional TDD modes is represented by 230. The DL symbol for the second TDD mode 230 among the multiple additional TDD modes is represented by 232, the flexible symbol for the second TDD mode 230 is represented by 224, and the UL symbol for the second TDD mode 230 is represented by 236.

[0057] like Figure 2As shown, in the case of additional TDD modes, the flexible symbol 214 of the default mode 210 can be used differently. In the case of the first TDD mode 220 of the plurality of additional modes, a portion of the flexible symbol 214 of the default mode 210 can be used as the DL symbol 222. In the case of the second TDD mode 230 of the plurality of additional modes, a portion of the flexible symbol 214 of the default mode 210 can be used as the UL symbol 236.

[0058] Figure 3 Examples of TDD configuration adaptation based on at least some example embodiments are shown. Figure 3a Showing more details Figure 3 The first part, and Figure 3b Showing more details Figure 3 The second part. Figure 3b As shown Figure 3 The second part will be placed Figure 3a As shown Figure 3 Next to the first part, making Figure 3b left side and Figure 3a The right side is adjacent to it, thus forming a complete [structure]. Figure 3 .

[0059] like Figure 2 In this situation, Figure 3 In this example, the default TDD mode is represented by 210, the first TDD mode with multiple additional TDD modes is represented by 220, and the second TDD mode with multiple additional TDD modes is represented by 230. The default TDD mode 210 can be based on the first SIB, for example, the SIB1 configuration can be defined according to the traditional TDD-UL-DL-ConfigurationCommon (in this example, mode length = P = 5ms).

[0060] Multiple additional TDD modes can be defined based on a second SIB (such as SIBx). For example, SIBx can be used to configure 6 additional TDD modes and (multiple) mode repetitions. Each valid TDD configuration (#0...#6, K=7) can be configured using a signaling pattern of length P (dynamic TDD configuration length = ...). 4P )of N=4x This is obtained through repeated iterations, represented by 310. The adaptation period used for TDD configuration can be... 4P (=20ms). SIBx can also be used to define PDCCH monitoring configurations for group public DCI (such as DCI 2_0).

[0061] exist Figure 3 In the example, there are four monitoring opportunities for each TDD mode ( 4PThis refers to each TDD mode from #0 to #7. Monitoring timing is... Figure 3 310 ( x The multiple monitoring opportunities 310 can be utilized to provide the necessary reliability for the group common DCI used to transmit TDD configuration. It should be noted that for the radio network node 120, the transmission of the group common DCI (indicating dynamic SFI) can be an optional feature. In some example embodiments, the UE 110 may have the necessary behavior defined for all resource types (DL, UL, flexible, protection), in which case the transmission of the group common DCI will not be required.

[0062] In some example embodiments, timing for the configuration of TDD mode can be taken into account. For example, the timing relationship could be that if the group common DCI is in TDD mode [ Z ] was received during the period, and no later than from TDD mode [ Z The beginning of ] Y If there are [number] time slots, then UE 110 can adjust the TDD mode. Z Otherwise, UE 110 can adjust the TDD mode. Z+1 ].

[0063] UE 110 requires a specific processing time for the group's common DCI. Therefore, during mode switching (from mode...) Z-1 To mode Z Sending group public DCI before it occurs is beneficial. On the other hand, to improve robustness, it is best to provide more than one monitoring opportunity per mode. To provide more options, a scenario is also considered where group public DCI (adjusting mode) occurs. Z In the pattern Z The start of the pattern is sent. The rationale for this is that a fixed DL symbol will be present at the beginning of the pattern so that the UE 110 still has time to process the group common DCI before an effective handover affecting flexible resources occurs.

[0064] The parameter defining the UE processing time can be expressed as: Y .exist Figure 3 In the example, Y=2 However, it should be noted that, Y Negative values ​​are also possible. If the group's common DCI is... Y Before one time slot (relative to the mode boundary) Z-1 , Z If it is received, it will affect the pattern. Z Otherwise, it will affect the pattern. Z+1 .

[0065] In some example embodiments, in addition to the group common DCI (such as DCI2_0), the unicast DCI may also be included in the TDD configuration indication (e.g., 1-3 bits). That is, the radio network node 120 may send a unicast DCI to the UE 110, wherein the unicast DCI includes an indication of whether to begin operation according to one of the plurality of additional TDD modes. Therefore, when the group common DCI is received during a monitoring period and the unicast DCI is received, the UE 110 can determine to operate according to one of the plurality of additional TDD modes. That is, when the contents of the group common DCI and the unicast DCI are the same, the UE 110 can assume that the indicated TDD mode is the same. Such a method can be used to further improve reliability. If the indication contains a conflict, the UE 110 can operate according to the latest DCI, or according to a DCI defined as having higher priority (e.g., unicast).

[0066] In some example embodiments, the monitoring configuration may be associated with unicast DCI. That is, UE 110 may monitor the PDCCH during at least one monitoring period and determine whether to operate according to one of the plurality of additional TDD modes based on whether unicast DCI is received on the PDCCH during the monitoring period. In some example embodiments, the monitoring configuration is associated with unicast DCI and at least one of the following scenarios: • Downlink grants are received by UE 110 via a predefined public search space; • Uplink grants are received by UE 110 via a predefined public search space; • Downlink grants are received by UE 110 via a predefined user-specific search space; or • Uplink grants are received by UE 110 via a predefined user-specific search space.

[0067] A UE-specific search space (USS) can be defined as a search space dedicated to each specific UE and notified to UE 110 via an RRC signaling message. Therefore, UE 110 will need to complete an RRC establishment to obtain information about the USS. The USS can be used to accommodate TDD configurations with unicast DCI and non-compact (or configurable) DCI formats, such as DCI format 0_1 ​​(uplink grant) and DCI format 1_1 (downlink grant).

[0068] The Common Search Space (CSS) can be defined as a specific search space in which each UE needs (or is at least able to) search for signals used by each UE (e.g., PDCCH for SIBs) or signaling messages applied to each UE before a dedicated channel is established for a specific UE (e.g., PDCCH used during RACH procedures) or for a specific UE group. For example, UE110 may need to detect PDCCH for SIB1 reception or various DCIs (PDCCHs) (e.g., DCIs for Msg2 / Msg4 reception) during RACH procedures. CSS can be used to enable TDD configuration to adapt to group common DCIs (such as DCI format 2_0) and / or unicast DCIs, as well as compact (or non-configurable) DCI formats, such as DCI format 0_0 (uplink grant) and DCI format 1_0 (downlink grant).

[0069] The configuration signaling division between the first SIB (such as SIB1) and the second SIB (such as SIBx) is exemplary. However, if the cell supports initial access, at least one mode may need to be broadcast to enable the UE 110's initial access in the cell of the radio network node 120. Cell configuration in 6G can be obtained through UE-specific messaging, and the configuration seen by the UE 110 (even if cell-specific in practice) can be considered merely a point-to-point configuration messaging from the radio network node 120 to the UE 110. Specific mode repetition can be considered optional, and if adopted, the number of times a mode is repeated can be dynamically indicated, can be a mode-specific configuration, a common configuration across all modes, or a value fixed by a standard.

[0070] Figure 4 A first signaling diagram according to at least some example embodiments is shown. User equipment 110 and wireless network node 120 are arranged from left to right on the vertical axis. Time progresses from top to bottom.

[0071] At step 402, the radio network node 120 may send a first SIB to the UE 110, wherein the first SIB indicates the default TDD mode. At step 404, the radio network node 120 may send a second SIB to the UE 110, wherein the second SIB indicates the plurality of additional TDD modes and the monitoring timing for monitoring the common DCI of the monitoring group.

[0072] Therefore, UE 110 can receive the first SIB and the second SIB from the radio network node 120. At step 406, UE 110 can determine a default TDD mode based on the first SIB and determine multiple additional TDD modes based on the second SIB. At step 408, UE 110 can operate according to the default TDD mode. The radio network node 120 can also determine that UE 110 operates according to the default TDD mode as configured.

[0073] At step 410, UE 110 can determine at least one monitoring opportunity for monitoring the group's common DCI based on the second SIB. The at least one monitoring opportunity may not be a single opportunity, but rather periodic opportunities. Therefore, for each mode ( N (×P) Multiple monitoring opportunities may exist. The wireless network node 120 can determine whether to configure UE 110 to start operation according to one of the multiple additional TDD modes by sending a group common DCI during the monitoring opportunity.

[0074] At optional step 412, UE 110 may receive a group common DCI from radio network node 120 during the monitoring opportunity (MO). If UE 110 receives the group common DCI during the MO, and the group common DCI indicates one of the plurality of additional TDD modes, then UE 110 may begin operation according to the one of the plurality of additional TDD modes. However, if UE 110 does not receive the group common DCI during the MO, then UE 110 may continue operation according to the default TDD mode.

[0075] Therefore, at step 414, UE 110 can determine whether to start operation according to one of the plurality of additional TDD modes based on whether the group public DCI is received during MO.

[0076] Figure 5An example apparatus capable of supporting at least some of the example embodiments is illustrated. Device 500 is shown, which may include, for example, a UE 110 or a wireless network node 120, or a control device configured to control its functions when installed therein. Device 500 includes a processor 510, which may include, for example, a single-core processor or a multi-core processor, wherein a single-core processor includes one processing core and a multi-core processor includes more than one processing core. Processor 510 typically includes a control device. Processor 510 may include more than one processor. Processor 510 may be a control device. Processor 510 may include at least one application-specific integrated circuit (ASIC). Processor 510 may include at least one field-programmable gate array (FPGA). Processor 510 may be a component for performing method steps in device 500. Processor 510 may be configured to perform actions at least partially by computer instructions.

[0077] A processor may include, or be composed of, one or more circuit systems configured to perform stages of a method according to the example embodiments described herein. As used herein, the term “circuit system” may refer to one or more of the following: (a) a hardware circuit implementation only (such as an implementation only in analog and / or digital circuit systems); and (b) a combination of hardware circuitry and software, such as (if applicable): (i) a combination of (multiple) analog and / or digital hardware circuitry with software / firmware; and (ii) any portion of (multiple) hardware processors (including (multiple) digital signal processors), software, and (multiple) memories having software, which work together to enable a device (such as a mobile phone or a server) to perform various functions; and (c) (multiple) hardware circuitry and / or (multiple) processors (such as (multiple) microprocessors or portions thereof) that require software (e.g., firmware) for operation, but may be absent when software is not required for operation.

[0078] The definition of "circuit system" applies to all uses of this term in this application, including in any claim. As another example, as used herein, the term "circuit system" also covers only the implementation of hardware circuitry or a processor (or processors) or portions thereof and their accompanying software and / or firmware. For example, if applicable to a particular claim element, the term "circuit system" also covers baseband integrated circuits or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing or networking devices.

[0079] Device 500 may include memory 520. Memory 520 may include random access memory and / or permanent memory. Memory 520 may include at least one RAM chip. For example, memory 520 may include solid-state memory, magnetic memory, optical memory, and / or holographic memory. Memory 520 may be at least partially accessible to processor 510. Memory 520 may be at least partially included in processor 510. Memory 520 may be a component for storing information. Memory 520 may include computer instructions configured to be executed by processor 510. When computer instructions configured to cause processor 510 to perform certain actions are stored in memory 520, and device 500 is configured as a whole to run using computer instructions from memory 520 under the guidance of processor 510, processor 510 and / or at least one of its processing cores may be considered to be configured to perform said certain actions. Memory 520 may be at least partially included in processor 510. Memory 520 may be at least partially located outside device 500, but accessible to device 500.

[0080] Device 500 may include a transmitter 530. Device 500 may include a receiver 540. Transmitter 530 and receiver 540 may be configured to transmit and receive information according to at least one cellular or non-cellular standard. Transmitter 530 may include more than one transmitter. Receiver 540 may include more than one receiver. For example, transmitter 530 and / or receiver 540 may be configured to operate according to Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), and / or 5G / NR standards.

[0081] Device 500 may include a near-field communication (NFC) transceiver 550. The NFC transceiver 550 may support at least one NFC technology, such as Bluetooth, Wibree, or similar technologies.

[0082] Device 500 may include a user interface (UI) 560. UI 560 may include at least one of the following: a display screen, a keyboard, a touchscreen, a vibrator (arranged to notify the user by causing device 500 to vibrate), a speaker, and a microphone. The user can operate device 500 via UI 560, for example, by accepting incoming calls, initiating phone or video calls, browsing the internet, managing digital files stored in memory 520, or accessible in the cloud via transmitter 530 and receiver 540, or via NFC transceiver 550, and / or playing games.

[0083] Device 500 may include or be arranged to accept a subscriber identity module 570. Subscriber identity module 570 may include, for example, a subscriber identity module SIM card that can be installed in device 500. Subscriber identity module 570 may include subscription information identifying the user of device 500. Subscriber identity module 570 may include encryption information that can be used to verify the identity of the user of device 500 and / or facilitate the encryption of communication information and billing the user of device 500 for communications conducted via device 500.

[0084] Processor 510 may be equipped with a transmitter arranged to output information from processor 510 to other devices included in device 500 via wires within device 500. Such a transmitter may include a serial bus transmitter, for example, arranged to output information to memory 520 for storage via at least one wire. Alternatively, the transmitter may include a parallel bus transmitter. Similarly, processor 510 may include a receiver arranged to receive information from other devices included in device 500 within processor 510 via wires within device 500. Such a receiver may include a serial bus receiver, for example, arranged to receive information from receiver 540 via at least one wire for processing within processor 510. Alternatively, the receiver may include a parallel bus receiver.

[0085] Device 500 may include Figure 5 Other devices not shown. For example, in the case where device 500 includes a smartphone, it may include at least one digital camera. Some devices 500 may include a rear camera and a front camera, wherein the rear camera may be designed for digital photography and the front camera for video calls. Device 500 may include a fingerprint sensor arranged to at least partially authenticate the user of device 500. In some example embodiments, device 500 lacks at least one of the above-mentioned devices. For example, some devices 500 may lack an NFC transceiver 550 and / or a user identification module 570.

[0086] Processor 510, memory 520, transmitter 530, receiver 540, NFC transceiver 550, UI 560, and / or user identity module 570 can be interconnected in various ways via wires within device 500. For example, each of the above devices can be individually connected to the main bus within device 500 to allow the devices to exchange information. However, as those skilled in the art will understand, this is merely an example, and various ways of interconnecting at least two of the above devices can be chosen depending on the exemplary embodiment without departing from the scope of the exemplary embodiment.

[0087] Figure 6This is a flowchart of a first method according to at least some example embodiments. The stages of the first method shown can be performed by the UE 110 or by a control device configured to control its functions when installed therein.

[0088] The first method may include, at step 610, receiving a first System Information Block (SIB) and a second SIB. The first method may further include, at step 620, determining a default Time Division Duplex (TDD) mode based on the first SIB, and determining multiple additional TDD modes based on the second SIB. The first method may further include, at step 630, operating according to the default TDD mode. At step 640, the first method may include, based on the second SIB, determining at least one monitoring opportunity for monitoring Group Common Downlink Control Information (DCI). At step 650, the method may include, based on whether the Group Common DCI is received during at least one monitoring opportunity, determining whether to operate according to one of the multiple additional TDD modes.

[0089] Figure 7 This is a flowchart of a second method according to at least some example embodiments. The stages of the second method shown can be performed by the UE 110 or by a control device configured to control its functions when installed therein.

[0090] The second method may include, at step 710, determining a default Time Division Duplex (TDD) mode and multiple additional TDD modes. The second method may also include, at step 720, operating according to the default TDD mode. Additionally, the second method may include, at step 730, determining a monitoring configuration with at least one monitoring opportunity for monitoring the Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is related to a TDD configuration adaptation. At step 740, the second method may include: determining a repetition configuration of the multiple additional TDD modes, wherein the repetition configuration includes at least one repetition number. At step 750, the second method may include: monitoring the PDCCH according to the monitoring configuration. At step 760, the second method may include: determining, based on whether the PDCCH is received during at least one monitoring opportunity, whether to operate according to one of the multiple additional TDD modes according to the at least one repetition number.

[0091] In some example embodiments, Example 1: An apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: - Receive the first system information block (SIB) and the second SIB; - The default time-division duplex (TDD) mode is determined based on the first SIB, and multiple additional TDD modes are determined based on the second SIB; - Operates according to the default TDD mode; - Based on the second SIB, determine at least one monitoring opportunity for monitoring the group common downlink control information (DCI); and - Determine whether to operate according to one of the multiple additional TDD modes based on whether the group public DCI is received during at least one monitoring period. Example 2. The apparatus according to Example 1, wherein the first SIB is SIB1 and the second SIB is another SIB, the second SIB is SIB1 and the first SIB is another SIB, or the first SIB is the second SIB. Example 3. An apparatus according to Example 1 or Example 2, wherein a group common DCI is used to deliver control information to more than one user equipment (UE) in a single DCI message. Example 4. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine that the group common DCI is received during the monitoring period, and that the group common DCI indicates one of the multiple additional TDD modes; and - Based on the received group common DCI, operate according to one of the multiple additional TDD modes. Example 5. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Based on the second SIB, determine the uplink and downlink symbols for the default TDD mode and at least one of the additional TDD modes; and - Determine periods of no transmission or reception based on one of the following to allow time to change the link direction: o will identify some, but not all, of the flexible symbols of the default TDD mode as the time periods of the multiple additional TDD modes; o The flexible symbol for the default TDD mode is determined as the time period of the plurality of additional TDD modes; or o Based on the second SIB, determine the time period of the plurality of additional TDD modes. Example 6. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - If the group's public DCI is not received during the monitoring period, operate according to the default TDD mode. Example 7. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine that the uplink and downlink symbols of the default TDD mode are the same as the uplink and downlink symbols of the plurality of additional TDD modes; and - Based on the second SIB, a flexible notation of the default TDD mode is used for each of the plurality of additional TDD modes. Example 8. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Based on the second SIB, determine the repeating configuration of the plurality of additional TDD modes, wherein the repeating configuration includes at least one number of repeats; and - When configured during the monitoring period, operate based on at least one number of repetitions. Example 9. The apparatus according to Example 8, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Receive an instruction that specifies at least one number of repetitions. Example 10. An apparatus according to any of the foregoing examples, wherein at least one processor and at least one memory are further configured such that the apparatus, when configured during monitoring, operates by at least the following: - Repeat one of the plurality of additional TDD modes according to the repeat configuration of the default TDD mode; - Repeat multiple additional TDD patterns from the plurality of additional TDD patterns according to a set number of repetitions; or - Repeat multiple additional TDD modes among the multiple additional TDD modes, wherein the number of repetitions is configured separately for each additional TDD mode among the multiple additional TDD modes. Example 11. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine the length of the plurality of additional TDD modes, wherein the length of the plurality of additional TDD modes is the same as the length of the default TDD mode. Example 12. An apparatus according to any of the preceding examples, wherein the plurality of additional TDD modes based on the second SIB are also based on the modes of the first SIB. Example 13. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: -Receive unicast DCI; and - Based on the received unicast DCI, determine the operation according to one of the plurality of additional TDD modes. Example 14. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine whether to operate according to one of the multiple additional TDD modes within a predefined time period. Example 15. A method comprising: - The device receives the first system information block (SIB) and the second SIB; - The device determines the default time-division duplex (TDD) mode based on the first SIB and determines multiple additional TDD modes based on the second SIB; - The device operates according to the default TDD mode; - The device determines at least one monitoring opportunity for monitoring the Common Downlink Control Information (DCI) based on the second SIB; and - The device determines whether to operate according to one of the plurality of additional TDD modes based on whether the group common DCI is received during at least one monitoring period. Example 16. According to the method of Example 15, wherein the first SIB is SIB1 and the second SIB is another SIB, the second SIB is SIB1 and the first SIB is another SIB, or the first SIB is the second SIB. Example 17. According to the method of Example 15 or Example 16, where group common DCI is used to deliver control information to more than one user equipment (UE) in a single DCI message. Example 18. The method according to any one of Examples 15 through 17 also includes: - Determine that the group common DCI is received during the monitoring period, and that the group common DCI indicates one of the multiple additional TDD modes; and - Based on the received group common DCI, operate according to one of the multiple additional TDD modes. Example 19. The method according to any one of Examples 15 through 18 also includes: - Based on the second SIB, determine the uplink and downlink symbols for the default TDD mode and at least one of the additional TDD modes; and - Determine periods of no transmission or reception based on one of the following to allow time to change the link direction: o will identify some, but not all, of the flexible symbols of the default TDD mode as the time periods of the multiple additional TDD modes; o The flexible symbol for the default TDD mode is determined as the time period of the plurality of additional TDD modes; or o Based on the second SIB, determine the time period of the plurality of additional TDD modes. Example 20. The method according to any one of Examples 15 through 19 also includes: - If the group's public DCI is not received during the monitoring period, operate according to the default TDD mode. Example 21. The method according to any one of Examples 15 to 20 also includes: - Determine that the uplink and downlink symbols of the default TDD mode are the same as the uplink and downlink symbols of the plurality of additional TDD modes; and - Based on the second SIB, a flexible notation of the default TDD mode is used for each of the plurality of additional TDD modes. Example 22. The method according to any one of Examples 15 to 21 also includes: - Based on the second SIB, determine the repeating configuration of the plurality of additional TDD modes, wherein the repeating configuration includes at least one number of repeats; and - When configured during the monitoring period, operate based on at least one number of repetitions. Example 23. Following the method of Example 22, it also includes: - Receive an instruction that specifies at least one number of repetitions. Example 24. According to any one of Examples 15 through 23, the method further includes, when configured during monitoring, the following actions are performed: - Repeat one of the plurality of additional TDD modes according to the repeat configuration of the default TDD mode; - Repeat multiple additional TDD patterns from the plurality of additional TDD patterns according to a set number of repetitions; or - Repeat multiple additional TDD modes among the multiple additional TDD modes, wherein the number of repetitions is configured separately for each additional TDD mode among the multiple additional TDD modes. Example 25. The method according to any one of Examples 15 through 24 also includes: - Determine the length of the plurality of additional TDD modes, wherein the length of the plurality of additional TDD modes is the same as the length of the default TDD mode. Example 26. The method of any one of Examples 15 to 25, wherein the plurality of additional TDD modes based on the second SIB are also based on the modes of the first SIB. Example 27. The method according to any one of Examples 15 through 26 also includes: -Receive unicast DCI; and - Based on the received unicast DCI, determine the operation according to one of the plurality of additional TDD modes. Example 28. The method according to any one of Examples 15 through 27 also includes: - Determine whether to operate according to one of the multiple additional TDD modes within a predefined time period.

[0092] In some example embodiments, Example 1: An apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: - Determine the default Time Division Duplex (TDD) mode and multiple additional TDD modes; - Operates according to the default TDD mode; - Determine a monitoring configuration for at least one monitoring opportunity involving the monitoring of the Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is adapted to the TDD configuration; - Determine the repeating configuration of the plurality of additional TDD modes, wherein the repeating configuration includes at least one number of repeats; - Monitor PDCCH according to the monitoring configuration; and - Based on whether the PDCCH is received during at least one monitoring period, determine whether to operate according to one of the plurality of additional TDD modes according to at least one number of repetitions. Example 2. The apparatus according to Example 1, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Receive the first system information block (SIB) and the second SIB; - The default TDD mode is determined based on the first SIB, and the plurality of TDD modes are determined based on the second SIB. Example 3. The apparatus according to Example 2, wherein the first SIB is SIB1 and the second SIB is another SIB, the second SIB is SIB1 and the first SIB is another SIB, or the first SIB is the same as the second SIB. Example 4. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - The monitoring configuration is determined based on at least one of the following: SIB1, another SIB, or dedicated radio resource control RRC signaling. Example 5. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine at least one monitoring opportunity for monitoring downlink control information (DCI); and - Based on whether DCI is received during at least one monitoring period, determine whether to operate according to one of the multiple additional TDD modes. Example 6. The apparatus according to Example 5, wherein the DCI is a group public DCI or a unicast DCI for delivering control information to more than one user equipment (UE) in a single DCI message. Example 7. An apparatus according to Example 5 or Example 6, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine that the DCI is received during the monitoring period, and indicate the one of the plurality of additional TDD modes; and - Based on the received DCI, operate according to one of the plurality of additional TDD modes. Example 8. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine the uplink and downlink symbols for the default TDD mode and at least one of the additional TDD modes; and - Determine periods of no transmission or reception based on one of the following to allow time to change the link direction: o will identify some, but not all, of the flexible symbols of the default TDD mode as the time periods of the multiple additional TDD modes; o The flexible symbol for the default TDD mode is determined as the time period of the plurality of additional TDD modes; or o Based on the second SIB, determine the time period of the plurality of additional TDD modes. Example 9. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine that the uplink and downlink symbols of the default TDD mode are the same as the uplink and downlink symbols of the plurality of additional TDD modes; and - Use a flexible notation of the default TDD mode for each of the multiple additional TDD modes. Example 10. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Receive an instruction that specifies at least one number of repetitions. Example 11. An apparatus according to any of the foregoing examples, wherein at least one processor and at least one memory are further configured such that the apparatus, when configured during monitoring, operates by at least the following: - Repeat one of the plurality of additional TDD modes according to the repeat configuration of the default TDD mode; - Repeat multiple additional TDD patterns from the plurality of additional TDD patterns according to a set number of repetitions; or - Repeat multiple additional TDD modes among the multiple additional TDD modes, wherein the number of repetitions is configured separately for each additional TDD mode among the multiple additional TDD modes. Example 12. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine the length of the plurality of additional TDD modes, wherein the length of the plurality of additional TDD modes is the same as the length of the default TDD mode. Example 13. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: -Receive unicast DCI; and - Based on the received unicast DCI, determine the operation according to one of the plurality of additional TDD modes. Example 14. An apparatus according to any of the preceding examples, wherein at least one processor and at least one memory are further configured such that the apparatus at least: - Determine whether to operate according to one of the multiple additional TDD modes within a predefined time period. Example 15. A device according to any of the preceding examples, wherein the monitoring configuration is associated with unicast DCI. Example 16. The apparatus according to Example 15, wherein the monitoring configuration is associated with at least one of the following scenarios: • Downlink authorization received via a predefined public search space; • Uplink authorization received via a predefined public search space; • Downlink authorization received via a predefined user-specific search space; or • Uplink authorization received via a predefined user-specific search space. Example 17. A method comprising: - The device determines the default Time Division Duplex (TDD) mode and multiple additional TDD modes; - The device operates according to the default TDD mode; - The device determines a monitoring configuration having at least one monitoring opportunity for monitoring the Physical Downlink Control Channel (PDCCH), wherein the monitoring configuration is related to a TDD configuration adaptation; - The device determines the repeating configuration of the plurality of additional TDD modes, wherein the repeating configuration includes at least one number of repeats; - The device monitors the PDCCH according to the monitoring configuration; and - The device determines whether to operate according to one of the plurality of additional TDD modes based on whether the PDCCH is received during at least one monitoring period and based on at least one number of repetitions. Example 18. Following the method of Example 17, it also includes: - Receive the first system information block (SIB) and the second SIB; - The default TDD mode is determined based on the first SIB, and the plurality of TDD modes are determined based on the second SIB. Example 19. According to the method of Example 17 or Example 18, wherein the first SIB is SIB1 and the second SIB is another SIB, the second SIB is SIB1 and the first SIB is another SIB, or the first SIB is the same as the second SIB. Example 20. The method according to any one of Examples 17 to 19 also includes: - The monitoring configuration is determined based on at least one of the following: SIB1, another SIB, or dedicated radio resource control RRC signaling. Example 21. The apparatus according to any one of Examples 17 to 20 further includes: - Determine at least one monitoring opportunity for monitoring downlink control information (DCI); and - Based on whether DCI is received during at least one monitoring period, determine whether to operate according to one of the multiple additional TDD modes. Example 22. According to the method of Example 21, where the DCI is a group public DCI or unicast DCI used to deliver control information to more than one user equipment (UE) in a single DCI message. Example 23. According to the method of Example 21 or Example 22, it also includes: - Determine that the DCI is received during the monitoring period, and indicate the one of the plurality of additional TDD modes; and - Based on the received DCI, operate according to one of the plurality of additional TDD modes. Example 24. The method according to any one of Examples 17 through 23 also includes: - Determine the uplink and downlink symbols for the default TDD mode and at least one of the additional TDD modes; and - Determine periods of no transmission or reception based on one of the following to allow time to change the link direction: o will identify some, but not all, of the flexible symbols of the default TDD mode as the time periods of the multiple additional TDD modes; o The flexible symbol for the default TDD mode is determined as the time period of the plurality of additional TDD modes; or o Based on the second SIB, determine the time period of the plurality of additional TDD modes. Example 25. The method according to any one of Examples 17 through 24 also includes: - Determine that the uplink and downlink symbols of the default TDD mode are the same as the uplink and downlink symbols of the plurality of additional TDD modes; and - Use a flexible notation of the default TDD mode for each of the multiple additional TDD modes. Example 26. The method according to any one of Examples 17 to 25 also includes: - Receive an instruction that specifies at least one number of repetitions. Example 27. According to any one of Examples 17 through 26, the method further includes, when configured during monitoring, the following actions are performed: - Repeat one of the plurality of additional TDD modes according to the repeat configuration of the default TDD mode; - Repeat multiple additional TDD patterns from the plurality of additional TDD patterns according to a set number of repetitions; or - Repeat multiple additional TDD modes among the multiple additional TDD modes, wherein the number of repetitions is configured separately for each additional TDD mode among the multiple additional TDD modes. Example 28. The method according to any one of Examples 17 through 27 further includes: - Determine the length of the plurality of additional TDD modes, wherein the length of the plurality of additional TDD modes is the same as the length of the default TDD mode. Example 29. The method according to any one of Examples 17 through 19 also includes: -Receive unicast DCI; and - Based on the received unicast DCI, determine the operation according to one of the plurality of additional TDD modes. Example 30. The method according to any one of Examples 17 through 29 also includes: - Determine whether to operate according to one of the multiple additional TDD modes within a predefined time period. Example 31. The method of any of Examples 17 to 30, wherein the monitoring configuration is related to unicast DCI. Example 32. According to the method of Example 31, the monitoring configuration is related to at least one of the following scenarios: • Downlink authorization received via a predefined public search space; • Uplink authorization received via a predefined public search space; • Downlink authorization received via a predefined user-specific search space; or • Uplink authorization received via a predefined user-specific search space.

[0093] It should be understood that the disclosed example embodiments are not limited to the specific structures, processing steps, or materials disclosed herein, but are extended to their equivalents as would be recognized by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting.

[0094] Throughout this specification, any reference to an exemplary embodiment or an exemplary embodiment means that a particular feature, structure, or characteristic described in connection with the various exemplary embodiments is included in at least one exemplary embodiment. Therefore, the appearance of the phrase "in one exemplary embodiment" or "in an exemplary embodiment" throughout the specification does not necessarily refer to the same exemplary embodiment. Where numerical values ​​are referenced using terms such as, for example, "about" or "substantially," exact numerical values ​​are also disclosed.

[0095] As used herein, for convenience, multiple items, structural elements, constituent elements, and / or materials may exist in a common list. However, these lists should be interpreted as each member being individually identified as a separate and unique member. Therefore, unless otherwise indicated, no single member in such a list should be construed as being equivalent to any other member in that list solely based on its existence in the common group. Furthermore, various exemplary embodiments and examples may be referenced herein together with alternatives for their respective components. It should be understood that such exemplary embodiments, examples, and alternatives should not be construed as being factually equivalent to each other, but should be considered as separate and independent representations.

[0096] In the example embodiments, the apparatus (such as, for example, UE 110 or wireless network node 120) may include components for performing the example embodiments described above and any combination thereof.

[0097] In exemplary embodiments, a computer program may be configured to cause a method according to the above exemplary embodiments and any combination thereof. In exemplary embodiments, a computer program product (embodied on a non-transitory computer-readable medium) may be configured to control a processor to perform a process including the above exemplary embodiments and any combination thereof.

[0098] In example embodiments, an apparatus (such as, for example, UE 110 or wireless network node 120) may include at least one processor and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured together with the at least one processor to cause the apparatus to perform at least the example embodiments described above and any combination thereof.

[0099] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more exemplary embodiments. In the foregoing description, numerous specific details (such as examples of length, width, shape, etc.) have been provided to provide a thorough understanding of exemplary embodiments of this disclosure. However, those skilled in the art will recognize that this disclosure can be practiced without one or more of the specific details, or utilizing other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of this disclosure.

[0100] While the foregoing examples illustrate the principles of exemplary embodiments in one or more specific applications, it will be apparent to those skilled in the art that various modifications can be made in form, use, and implementation details without requiring inventive thinking or departing from the principles and concepts of this disclosure. Therefore, this disclosure is not intended to be limiting unless otherwise specified in the claims set forth below.

[0101] In this document, the verbs "to comprise" and "to include" are used as open-ended qualifiers, neither excluding nor requiring the presence of any unmentioned features. Unless otherwise expressly stated, the features listed in the dependent claims may be freely combined with each other. Furthermore, it should be understood that the use of "a" or "an" throughout the document, i.e., the singular form, does not exclude the plural form. Industrial application

[0102] At least some example embodiments have industrial applications in cellular communication networks (e.g., in 3GPP networks where TDD is used). List of abbreviations 3GPP Third Generation Partnership Project BS base station CSS General Search Space DCI Downlink Control Information DL downlink GSM Global Mobile Communication System IE Information Elements IoT (Internet of Things) LTE Long Term Evolution M2M (Machine-to-Machine) MO monitoring timing MTC Machine Type Communication NES Network Energy Saving NFC (Near Field Communication) NR New Radio PDCCH (Physical Downlink Control Channel) RAN (Radio Access Network) RAT Radio Access Technology RRC Radio Resource Control SIB System Information Block SFI Slot Format Indicator TDD (Time Division Duplex) TRP Sending and Receiving Points UE User Equipment UI (User Interface) UL uplink USS UE-specific search space WCDMA Wideband Code Division Multiple Access WiMAX Global Microwave Access Interoperability WLAN (Wireless Local Area Network) List of reference numerals

Claims

1. An apparatus for communication, comprising at least one processor and at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: Receive the first system information block (SIB) and the second SIB; The default time-division duplex (TDD) mode is determined based on the first SIB, and multiple additional TDD modes are determined based on the second SIB. Operate according to the default TDD mode; Based on the second SIB, at least one monitoring opportunity is determined for monitoring the group common downlink control information (DCI). as well as Based on whether the group of public DCIs is received during the at least one monitoring period, it is determined whether to operate according to one of the plurality of additional TDD modes.

2. The apparatus of claim 1, wherein the first SIB is SIB1 and the second SIB is another SIB, the second SIB is SIB1 and the first SIB is another SIB, or the first SIB is the second SIB.

3. The apparatus according to claim 1 or claim 2, wherein the group common DCI is used to deliver control information to more than one user equipment (UE) in a single DCI message.

4. The apparatus of claim 1 or claim 2, wherein the at least one processor and the at least one memory are further configured such that the apparatus at least: It is determined that the group common DCI was received during the monitoring period, and the group common DCI indicates the one of the plurality of additional TDD modes; as well as Based on the received group of common DCI, operate according to one of the multiple additional TDD modes; or Based on the second SIB, uplink and downlink symbols for the default TDD mode and at least one of the additional TDD modes in the plurality of additional TDD modes are determined. as well as Periods of no transmission or reception are determined based on one of the following criteria to allow time for changing the link direction: Some, but not all, of the flexible symbols of the default TDD mode are identified as the time periods of the plurality of additional TDD modes; The flexible symbol of the default TDD mode is determined as the time period of the plurality of additional TDD modes; or Based on the second SIB, the time period of the plurality of additional TDD modes is determined.

5. The apparatus of claim 1 or claim 2, wherein the at least one processor and the at least one memory are further configured such that the apparatus at least: If it is determined that the group of public DCIs was not received during the monitoring period, the operation shall be performed according to the default TDD mode; or The uplink and downlink symbols of the default TDD mode are determined to be the same as the uplink and downlink symbols of the plurality of additional TDD modes; as well as Based on the second SIB, a flexible notation of the default TDD mode is used for each of the plurality of additional TDD modes.

6. The apparatus of claim 1 or claim 2, wherein the at least one processor and the at least one memory are further configured such that the apparatus at least: Based on the second SIB, a repeating configuration of the plurality of additional TDD modes is determined, wherein the repeating configuration includes at least one number of repeats; as well as When configured during the monitoring period, it operates according to the at least one number of repetitions; or Receive an instruction specifying the at least one number of repetitions; or Determine the length of the plurality of additional TDD modes, wherein the length of the plurality of additional TDD modes is the same as the length of the default TDD mode.

7. The apparatus of claim 1 or claim 2, wherein the at least one processor and the at least one memory are further configured such that the apparatus, when configured during the monitoring period, operates by at least the following: Based on the repeated configuration of the default TDD mode, repeat the one additional TDD mode among the plurality of additional TDD modes; Repeat multiple additional TDD patterns from the plurality of additional TDD patterns according to a set number of repetitions; or Repeat one of the plurality of additional TDD modes, wherein the number of repetitions is configured separately for each of the plurality of additional TDD modes.

8. The apparatus of claim 1 or claim 2, wherein the plurality of additional TDD modes based on the second SIB are also based on the modes of the first SIB.

9. The apparatus of claim 1 or claim 2, wherein the at least one processor and the at least one memory are further configured such that the apparatus at least: Receive unicast DCI; as well as Based on the received unicast DCI, determine whether to operate according to one of the plurality of additional TDD modes; or Determine whether to operate according to one of the multiple additional TDD modes within a predefined time period.

10. A method for communication, comprising: The device receives the first system information block (SIB) and the second SIB. The device determines a default time-division duplex (TDD) mode based on the first SIB and determines multiple additional TDD modes based on the second SIB. The device operates according to the default TDD mode; The device determines at least one monitoring opportunity for monitoring the Group Common Downlink Control Information (DCI) based on the second SIB. as well as The device determines whether to operate according to one of the plurality of additional TDD modes based on whether the group of common DCIs is received during the at least one monitoring period.

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