Wake-up signal sub-packets for enhanced machine-type communication (eMTC) and narrowband Internet of Things (NB-IoT)

Abstract

The techniques discussed herein may facilitate group-based WUS (wake-up signal) communication for eMTC (enhanced machine type communication) and / or NB (narrowband) ‑IoT (internet of things). An exemplary embodiment is a device configured to be employed in a UE (user equipment), the device comprising: a memory interface; and a processing circuit configured to: determine a WUS group in a plurality of WUS groups, wherein the WUS group is associated with a first group of WUS (wake-up signal) in a plurality of groups of WUS; determine a starting subframe of the first group of WUS; and monitor a starting subframe of the first group of WUS, wherein the UE is configured to communicate via one or more of eMTC or NB (narrowband) ‑IoT.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of the following patents: U.S. Provisional Patent Application No. 62 / 717172, entitled “WAKE-UP SIGNALSUB-GROUPING FOR REL-16EMTC AND NB-IOT,” filed on August 10, 2018, U.S. Provisional Patent Application No. 62 / 739063, entitled “WAKE-UP SIGNAL SUB-GROUPING FOR REL-16EMTC AND NB-IOT,” filed on September 28, 2018, and U.S. Provisional Patent Application No. 62 / 829588, entitled “WAKE-UP SIGNAL SUB-GROUPING FOR REL-16EMTC AND NB-IOT,” filed on April 4, 2019, the contents of which are incorporated herein by reference in their entirety. Background Art

[0003] Mobile communications have evolved significantly from early voice systems to today's highly complex integrated communications platforms. The next generation wireless communication system 5G (or New Radio (NR)) will provide information access and data sharing anytime, anywhere by a variety of users and applications. NR is expected to be a unified network / system designed to meet very different and sometimes conflicting performance dimensions and services. Such different multi-dimensional requirements are driven by different services and applications. In general, NR will evolve based on 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution)-Advanced and additional potential new radio access technologies (RATs), enriching people's lives with better, simple and seamless wireless connectivity solutions. NR will enable everything to connect wirelessly and provide fast, rich content and services. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1 is a block diagram illustrating a system that can be employed at a UE (User Equipment) or a BS and facilitates WUS (wake-up signal) based communication of a subgroup of UEs in accordance with various aspects described herein.

[0005] Figure 2 is a diagram illustrating an example scheme of UE group WUS sequence generation in accordance with various aspects described herein.

[0006] Figure 3 is a diagram illustrating an example of separate time domain and frequency domain OCC (Orthogonal Cover Codes) for WUS in various aspects.

[0007] Figure 4is a diagram illustrating an example of Rel-15 and Rel-16 WUS multiplexing for LTE eMTC according to embodiments described herein.

[0008] Figure 5 is a diagram illustrating an example of Rel-15 and Rel-16 WUS multiplexing for LTE NB-IoT according to various embodiments described herein. DETAILED DESCRIPTION

[0009] The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. In various aspects, the embodiments described herein may facilitate communication based on WUS (wake-up signal) of UE subgroups for eMTC and / or NB-IoT.

[0010] See also Figure 1 , a block diagram of a system 100 in multiple embodiments is illustrated, which can be employed at a UE (user equipment) (e.g., as system 1001) or a BS (base station) (e.g., as system 1002) and facilitates communication based on a WUS (wake-up signal) of a UE subgroup. The system 100 may include: a processor 110, which includes a processing circuit and an associated interface (e.g., a communication interface for communicating with a communication circuit 120, a memory interface for communicating with a memory 130, etc.); a communication circuit 120 (e.g., including circuits for wired and / or wireless connections; for example, a transmitter circuit (e.g., a transmitter circuit associated with one or more transmission chains) and / or a receiver circuit (e.g., a receiver circuit associated with one or more reception chains), wherein the transmitter circuit and the receiver circuit may employ common circuit elements and / or different circuit elements or a combination thereof); and a memory 130 (which may include any of a variety of storage media and may store instructions and / or data associated with one or more of the processor 110 or the transceiver circuit 120). In various aspects, the system 100 may be included in a user equipment (UE). In terms of the BS, the system 1002 may be included in an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (evolved Node B, eNodeB or eNB), a next generation Node B (gNodeB or gNB), or other base station or TRP (transmit / receive point) in a wireless communication network, wherein the processor 1102, the communication circuit 1202, and the memory 1302 may be located in a single device, or may be included in different devices, such as part of a distributed architecture. In an embodiment, signaling from the UE to the BS may be generated by the processor 1101, transmitted by the communication circuit 1201, received by the communication circuit 1202, and processed by the processor 1102, while signaling from the BS to the UE may be generated by the processor 1102, transmitted by the communication circuit 1202, received by the communication circuit 1201, and processed by the processor 1101.

[0011] In 3GPP (3rd Generation Partnership Project) Rel-16 (Release 16) eMTC (enhanced MTC (machine type communication)) WI (work item), one targeted enhancement to be further developed is to support UE (user equipment) group wake-up signal (WUS) to improve UE power saving: "Improved DL transmit efficiency and / or UE power consumption: Specify support for UE group wake-up signal (WUS) [RAN1 (Radio Access Network WG1 (Working Group 1), RAN2, RAN4]."

[0012] Similarly, Rel-16 NB (Narrowband)-IoT (Internet of Things) WI also has a targeted enhancement to be further developed to specify support for UE Group WUS: "Improved DL transmit efficiency and / or UE power consumption: Specify support for UE Group Wake-up Signal (WUS) [RAN1, RAN2, RAN4]."

[0013] In various embodiments, WUS communications may be sent and received according to the design of UE group WUS described herein that may support both Rel-16eMTC and NB-IoT. A brief overview of the WUS design in Rel-15eMTC and NB-IoT is first discussed below. WUS or DTX (discontinuous transmission) is introduced into the idle mode of Rel-15eMTC and NB-IoT, where WUS may be transmitted when there is at least one UE to be woken up in the associated paging group.

[0014] For frequency domain resource configuration, in NB-IoT, WUS is a 1-PRB signal. On the other hand, in eMTC, WUS is a 2-PRB signal, where NB-IoT WUS is repeated in the frequency domain on 2 consecutive PRBs.

[0015] For time domain resource configuration, WUS occupies the last 11 symbols in a subframe and may be repeated to achieve specific coverage. The number of repetitions may be configured via a scaling factor between the maximum WUS duration and the Rmax of the MPDCCH (MTC-PDCCH (Physical Downlink Control Channel)) candidate for paging. The non-zero gap from the end of the configured maximum WUS duration to the associated PO (Paging Time) can be configured by a higher layer.

[0016] The WUS sequence design can adopt a ZC (Zadoff_Chu) sequence of length 131 and a Gold sequence for RE (resource unit) level scrambling as shown below: "The WUS sequence w(m) in subframe x=0, 1, ..., M-1 is defined by the following terms:

[0017]

[0018] m=0,1,…,131

[0019] m′=m+132x

[0020] n=m mod 132

[0021]

[0022]

[0023] where M is the actual duration of the WUS.

[0024] Scrambling sequence Given by clause 7.2 of [3GPP TS 36.211] and [can be] initialized at the start of the WUS with:

[0025]

[0026] Where n f_start_PO is the first frame of the first PO associated with WUS, and n s_start_PO It is the first time slot of the first PO associated with the WUS.

[0027] In Rel-15eMTC and NB-IoT (e.g., which may be applied to legacy UEs that do not support group-based WUS), one WUS is applied to all UEs associated to the corresponding PO. In contrast, various embodiments described herein may support sub-grouping of WUS, thereby further improving UE power savings in existing (e.g., Rel-15) systems by reducing the probability of waking up a UE when paging is for another UE associated to the same PO.

[0028] Various embodiments described herein may transmit WUS according to the design described herein for WUS subgroups for Rel-16eMTC and NB-IoT. Specifically, the details of the design include features and techniques that may be used for: (1) configuration and capabilities for UE group WUS; (2) determination of UE groups; and (3) WUS multiplexing for different UE groups.

[0029] Configuration and capabilities: For the configuration of UE group WUS, in various embodiments, the UE group WUS can be enabled and / or disabled by higher layer signaling. In one example, cell-specific signaling (e.g., SIB1 (System Information Block Type 1)-BR (Bandwidth Reduction) for eMTC or SIBx-BR with x>1, and SIB1-NB for NB-IoT or SIBy-NB with y>1) can be used for the configuration. The number of UE groups supported may be 1, 2, 3, 4 or more. In an exemplary embodiment, the maximum number of UE groups that can be supported by eMTC and NB-IoT may be different, for example, for eMTC, a maximum of 4 UE groups, and in NB-IoT, a maximum of 2 UE groups.

[0030] In some embodiments, the number of UE groups may be fixed in the 3GPP specification. In other embodiments, the number of UE groups may be configurable by higher layer signaling (eg, via SIB as described above).

[0031] UE capabilities may also be addressed in a variety of ways, depending on the implementation. In some implementations, the UE may signal its ability to support UE group WUS via an existing capability reporting procedure. In other implementations, a Rel-16 UE that supports the WUS feature may support UE group WUS.

[0032] Determination of UE subgroups : In various embodiments, the grouping may depend on the UE_ID (UE identifier, such as IMSI (International Mobile Subscriber Identity)). In some such embodiments, the UE_ID may be IMSI mod 4096 for NB-IoT and IMSI mod 16384 for eMTC, similar to the case for calculating PO in Rel-13 NB-IoT and eMTC, respectively. In the following discussion, the number of UE groups is N G .

[0033] In some exemplary embodiments, the UE group ID of a UE may be obtained by UE_ID mod N G to determine (eg, via processor 1101 and / or processor 1102).

[0034] Alternatively, in other exemplary embodiments, the UE group ID of the UE may be floor(UE_ID / N) mod N G , where N=min(T,nB), T is the DRX cycle of the UE as defined in TS 3GPP 36.304, and nB can be 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, T / 32, T / 64, T / 128, T / 256, and for NB-IoT, it can also be T / 612 and T / 1024.

[0035] In other exemplary embodiments, the UE group ID of the UE may be obtained by floor(UE_ID / N / Ns) mod N G is determined, where N is defined as above, and Ns=max(1,nB / T).

[0036] In other exemplary embodiments, for eMTC, the UE group ID of the UE may be floor(UE_ID / N / Ns / Nn)modN G , where N and Ns are defined as above, and Nn is the number of paging narrowbands in the system information. For NB-IoT, the UE group ID of the UE can be floor(UE_ID / N / Ns / W) mod N G , where N and Ns are defined as above, and W is the total weight of all NB-IoT paging carriers (i.e., W = W(0) + W(1) + ... + W(Nn-1)).

[0037] In other embodiments, any of the above options may be combined with the use of a hashed version of the UE_ID (UE_ID_hashed) in order to better distribute the UEs in the WUS subgroups. For example, UE_ID_hashed = (A*UE_ID) modD, where A and D are prime numbers, such as those defined in 3GPP TS 36.213 for EPDCCH (Enhanced PDCCH (Physical Downlink Control Channel)).

[0038] In other embodiments, the UE group ID of the UE can be obtained by floor(UE_ID_H / T eDRX,H )mod N G or floor(UE_ID_H / T eDRX,H / 4)mod N G is determined, where UE_ID_H is the 10 most significant bits of the hash ID for eMTC (e.g., where UE_ID_H and its relationship to the hash ID may be as described in 3GPP TS 36.304 for MPDCCH) and the 12 most significant bits of the hash ID for NB-IoT (e.g., where UE_ID_H and its relationship to the hash ID may be as described in 3GPP TS 36.304 for NPDCCH), and T eDRX,H is the eDRX (extended DRX) cycle of the UE in the superframe. This can be used when the UE is configured with eDRX.

[0039] In other embodiments, the group may depend on the C-RNTI (Cell-RNTI (Radio Network Temporary Identifier)) allocated to the UE before the UE enters idle mode. For example, the UE group ID may be C-RNTI mod N G .

[0040] WUS design supporting UE sub-grouping : In some embodiments, a common wake-up indication for all UE groups may be defined. This can be used for SI updates and direct indication information. In such embodiments, the WUS may be designed to support N G +1 case, so that N G +1 A WUS capable of being distinguished may be multiplexed before supporting the corresponding PO.

[0041] In some exemplary embodiments, the WUS sequence and resources allocated to Rel-15 UEs (e.g., legacy UEs that do support group WUS) may be used for common wake-up indications. In such embodiments, power savings for Rel-16 UEs may be reduced, since common wake-up indications will be sent as long as there is at least one Rel-15 UE to be woken up in the corresponding PO.

[0042] In other exemplary embodiments, the WUS sequence and resources allocated to the Rel-15 WUS may be used for WUS indication of a UE group of Rel-16 UEs. In such embodiments, it would be equivalent to assigning a subgroup of Rel-16 UEs and all Rel-15 UEs associated to the corresponding PO to the same group.

[0043] In other exemplary embodiments, a WUS sequence and / or time / frequency resource set for a WUS different from a Rel-15 WUS may be used for all Rel-16 UE groups and a common wake-up indication for all Rel-16 UE groups. With this example, for the case of SI update or direct indication information, both a Rel-15 WUS and a WUS for a common indication for all Rel-16 UE groups may be sent to wake up all Rel-15 UEs and Rel-16 UEs associated with the corresponding PO.

[0044] For WUS of different UE groups, various implementations may adopt one of the following multiplexing techniques.

[0045] In some embodiments, WUS or common indications for different UE groups may be multiplexed in the frequency domain. In Rel-15eMTC, WUS occupies 2 PRBs in the frequency domain, while 6 PRBs are available in each narrowband. Within a narrowband, up to 3 WUS may be multiplexed in the frequency domain. A mapping may be defined between: the lowest PRB position of the WUS from PRB 0, PRB 2, and PRB 4 to UE group 0, UE group 1, and common indications.

[0046] In some implementations, the mapping may be fixed in the specification, such as PRB 0 to UE group 0, PRB 2 to UE group 1, PRB 4 to common WUS indication, etc.

[0047] Alternatively, in other implementations, the mapping may be configured by higher layer signaling. In other words, the lowest PRB position of UE Group 0, UE Group 1, and the common WUS indication may be indicated by higher layer signaling.

[0048] In other embodiments, the lowest PRB position indicated by the common WUS may be configured by a higher layer (e.g., a PRB for Rel-15 WUS), while other PRBs may be allocated in sequence for UE groups. For example, PRBs with smaller indices may be used for UE group 0, while PRBs with larger indices may be used for UE group 1.

[0049] In the case of using both frequency domain multiplexing and code domain multiplexing (described below), UE group 0 and UE group 1 in the implementation scheme can be replaced by UE group i, i+1, ..., i+X-1 and UE group i+X, i+X+1, ..., i+2X-1, respectively. UE group i, i+1, ..., i+X-1 can be assigned to the same set of PRBs and can be distinguished by different sequences. Similarly, UE group i+X, i+X+1, ..., i+2X-1 can be assigned to the same set of PRBs and can be distinguished by different sequences, where X is the number of WUSs that can be multiplexed in the code domain.

[0050] In addition to frequency domain multiplexing within one narrowband, different narrowbands can be configured to multiplex WUSs of more UE groups associated to the same PO. For example, N NB , which allows support for up to 3N NB UE groups. The narrowband associated to the UE group may be signaled by higher layers, for example as part of the UE group WUS configuration. Alternatively, the NBs on which the WUS subgroups corresponding to the paging NBs (PNBs) may be distributed are the same as the NB set used for paging monitoring, thereby indexing each 2-PRB set within each PNB in ​​the PNBs with wraparound processing in ascending order, for example, such that for the PNB sequence (s j ,s j+1 ,…,s j+n …,s j+Nn-1 ), the WUS frequency domain resources can be identified as (0,1,2,…,(Nn*3-1)), so that resource index #0, #1, #2 belong to NB s j , #3, #4, #5 belong to NB s j+1 Etc. Therefore, the determination of the UE subgroup automatically leads to the identification of the corresponding NB and the specific 2-PRB set within the NB to monitor the WUS.

[0051] In such embodiments, frequency retuning may be employed for switching from the narrowband for monitoring WUS to the narrowband for paging monitoring. In one example, the configured gap duration between the end of the maximum WUS duration and the start of the associated PO may be used for frequency retuning.

[0052] For NB-IoT, multiple NB-IoT DL carriers may be configured to multiplex the WUS of different UE groups in the frequency domain. The NB-IoT DL carriers associated with a UE group may be configured by a higher layer, for example, as part of the UE group WUS configuration. Alternatively, the NB-IoT DL carriers associated with a UE group for WUS monitoring may be determined similarly to the determination of paging carriers in the case of NB-IoT paging using multiple carriers. That is, for the N wus NB-IoT DL carriers with WUS, the UE group (and thus the carrier for WUS monitoring) may be given as the carrier with the smallest n such that floor(UE_ID / N / Ns) mod W < W(0) + W(1) + … + W(n), where W = W(0) + W(1) + … + W(N wus - 1). In such embodiments, in order to achieve additional frequency domain multiplexing beyond paging carriers, N wus may be greater than Nn, where Nn is the number of NB-IoT DL carriers associated with paging.

[0053] In such embodiments, frequency retuning may facilitate switching from the DL carrier for monitoring WUS to the DL carrier for paging monitoring. For example, similar to the eMTC technology described above, the configured gap duration between the end of the maximum WUS duration and the start of the associated PO may be used for frequency retuning.

[0054] In other embodiments, different WUS sequences may be defined for different UE groups and / or common WUS indications.

[0055] In some exemplary embodiments, time domain cyclic shifts may be used. For example, similar to NSSS, 4 cyclic shifts {0, 33, 66, 99} may be used. Alternatively, 2 or 3 cyclic shifts may be used, such as {0, 66} or {33, 99} for 2 cyclic shifts, and {0, 44, 88} may be used for 3 cyclic shifts. In the case where the cyclic shift is 0, the sequence is the same as the Rel-15 WUS. The cyclic shifts that a UE group may use may be fixed in the specification or configured by a higher layer.

[0056] Alternatively, in other exemplary embodiments, the initialization of the Gold sequence of the Rel-15 WUS may be modified to include the UE group ID. For example, the scrambling sequence It is given by clause 7.2 of 3GPP TS 36.211 and can be initialized at the beginning of WUS using formula (1):

[0057]

[0058] Among them G ID is the UE group ID. However, formula (1) with the UE group ID update is only an example, and other ways of carrying UE ID information in the WUS sequence may also be adopted in various embodiments. In another example, the UE group ID G ID , Community and variables used to determine the onset of WUS in the time domain (e.g. and ) can be combined in a nonlinear way in In the expression of, as shown in formula (2):

[0059]

[0060] In some other examples, a different multiplier (e.g., which may be a power of 2) may be applied to The various terms of the expression are shown in formula (3):

[0061]

[0062] Another technique that may be used in an implementation to generate different WUS sequences for multiple UE groups is to use the same initialization value c in clause 7.2 of 36.211. ini_WUS To generate a long scrambling sequence Here is the total number of UE groups. Then, a specific WUS sequence can be generated by selecting a suitable length portion (2·132M) from the long scrambling code sequence. Therefore, it can be calculated as in formula (4) for The UE group determines the WUS scrambling sequence:

[0063]

[0064] In such an embodiment, the WUS with group ID v=0 corresponds to the legacy Rel-15 WUS. Figure 2 , illustrated is a diagram of an exemplary scheme for UE group WUS sequence generation in the various aspects described herein.

[0065] Therefore, the UE group WUS sequence can be defined by formula (5):

[0066]

[0067] Where M is the number of WUS subframe transmissions, 1≤M≤MWUSmax , where M WUSmax is the maximum number of WUS subframes, as defined in 3GPP TS 36.213.

[0068] Scrambling sequence The scrambling sequence According to clause 7.2 of 36.211, it can be initialized at the beginning of WUS according to formula (6):

[0069]

[0070] Where n f_start_PO is the first frame of the first PO associated with the MWUS, and n s_start_PO It is the first time slot of the first PO associated with the MWUS.

[0071] Low cross-correlation is one of the design goals of the UE group WUS sequence. Generally speaking, sequences with low cross-correlation can be better distinguished from each other at the UE receiver. Therefore, in various embodiments, in addition to the Rel-15 WUS sequence w(m), an orthogonal cover code in the time domain can be used. See Figure 3 , illustrated is an exemplary diagram showing separate time domain and frequency domain OCC (orthogonal cover codes) for WUS according to various aspects described herein. Figure 3 In the example of FIG. 1 , for each subframe of the WUS signal, a time domain OCC (TD OCC) is applied (eg, all subcarrier signals in each OFDM symbol may be premultiplied by the corresponding symbol in the TD OCC).

[0072] Since the WUS signal occupies 11 OFDM symbols of a subframe, the TD OCC has a length equal to 11. In some embodiments, a Barker code of length 11 may be used as the TD OCC, where the Barker code is as shown in formula (7):

[0073] a(l)=[1 1 1 -1 -1 -1 1 -1 -1 1 -1] (7)

[0074] In such a scenario, different cyclic shifts (CS) of the underlying Barker code may be used to generate sets of unique TD OCCs corresponding to different UE groups.

[0075] In addition to TD OCC, in the same or other embodiments, frequency domain OCC (FD OCC) may be applied to each subframe containing a WUS (e.g., each subcarrier signal of each OFDM symbol may be premultiplied by the corresponding symbol in FD OCC), as also shown in FIG. Figure 3 For example, some implementations may use the columns of the matrix G of formula (8) as different FD OCCs corresponding to different UE groups:

[0076]

[0077] Therefore, the UE group sequence can be defined as formula (9):

[0078]

[0079]

[0080] m=0,1,...,132M-1,

[0081] where a(l) is a Barker code of length 11, and g v is the vth column of the matrix G. W(m) is the traditional Rel-15WUS sequence defined in the technical specification.

[0082] In other embodiments, different time domain resources may be configured for different UE groups associated to the same PO. In Rel-15, the time domain resources of a WUS are determined by a configurable maximum WUS duration and a configurable gap between the end of the maximum WUS duration and the start of the associated PO. In order to support WUS multiplexing for different UE groups in the time domain, one or more of the following techniques may be used.

[0083] For eMTC, the starting subframe of the WUS transmission of the UE group can be the latest subframe, so that before the start of the next WUS transmitted for another UE group associated to the same PO, there is a Lwus BL (Bandwidth Reduction Low Complexity) / CE (Coverage Enhancement) DL subframe, and there is a Lgap subframe from the start of the associated PO, where Lwus is the configured maximum WUS duration, and Lgap is the configured gap between the end of the maximum WUS duration of the UE and the start of the associated PO. If the last WUS is transmitted before the associated PO, the start of the WUS can be the latest subframe, so that before the start of the associated PO, there is a Lwus BL / CE DL subframe, followed by an Lgap subframe.

[0084] For NB-IoT, similar to eMTC, the starting subframe of the WUS transmission for a UE group can be the latest subframe, so that before the start of the next WUS transmitted for another UE group associated to the same PO, there are a total of Lwus NB-IoT DL subframes and subframes carrying SIB1-NB, and there are Lgap subframes from the start of the associated PO, where Lwus is the configured maximum WUS duration, and Lgap is the configured gap between the end of the UE's maximum WUS duration and the start of the associated PO. If the last WUS was transmitted before the associated PO, the start of the WUS is the latest subframe, so that before the start of the associated PO, there are a total of Lwus NB-IoT DL subframes and subframes carrying SIB1-NB, followed by Lgap subframes. In addition, the NB-IoT UE can assume that there are at least 10 NB-IoT DL subframes between the end of the WUS and the first associated PO, as in the Rel-15 design.

[0085] WUS multiplexing in the time domain can be combined with the above-mentioned embodiments (e.g., multiplexing in the frequency domain and / or code domain). For example, two time resource sets can be configured for the WUS of different UE groups associated to the same PO, and in addition to this, 2 cyclic shifts can be used. With this approach, the WUS of two Rel-16 UE groups can be multiplexed via cyclic shifts in the first time domain resource set, while the common WUS indication and the WUS of the Rel-15 UE can be multiplexed in the second time domain resource set. Regarding backward compatibility, the second time domain resource set can be configured in the same way as the Rel-15 WUS time resource configuration, and cyclic shift 0 can be used for the WUS of the Rel-15 UE (i.e., legacy UEs that do not support group WUS).

[0086] See also Figure 4 , illustrated is an exemplary diagram showing Rel-15 and Rel-16 WUS multiplexing for LTE eMTC in an implementation scheme. In some implementation schemes, in order to maintain WUS detection performance for legacy Rel-15 UEs, legacy Rel-15 WUS may be transmitted in a separate time resource without further multiplexing with other WUS via frequency division multiplexing and / or code division multiplexing (FDM and / or CDM, respectively). All other WUS may be transmitted in different time resources and may be further multiplexed using FDM and / or CDM. This multiplexing strategy allows power boosting to be applied to legacy WUS transmissions. Furthermore, it avoids interference within the serving cell from new WUS associated with the same PO as legacy WUS.

[0087] For NB-IoT scenarios, a similar approach can be repeated, but it is necessary to consider that the NB-IoT carrier bandwidth is equal to one physical resource block (PRB), which significantly reduces the FDM opportunities. Figure 5 , illustrated is a diagram showing an example of Rel-15 and Rel-16 WUS multiplexing for LTE NB-IoT according to various embodiments described herein.

[0088] With time domain multiplexing, the gap between the start of a WUS and the associated PO may be quite large, especially when the configured maximum WUS duration is large, which may affect the UE power saving gains. Therefore, in one example, time domain multiplexing can be supported only when the maximum WUS duration is limited (e.g., not exceeding a threshold, such as 16 or 32 for eMTC and 256 or 512 for NB-IoT). The threshold may be fixed in the specification or may be configurable.

[0089] As described above, different combinations of the above embodiments may be supported. For example, for eMTC, in addition to the maximum 3 possible WUS multiplexed in the frequency domain, X different WUS sequences may be introduced into the UE subgroups, and Y different WUS positions in the time domain may be configured for the UE subgroups. Thus, a maximum of 3*X*Y UE groups may be supported. Similarly, for NB-IoT, with X different WUS sequences and Y different WUS time domain resource sets, a maximum of X*Y UE groups may be supported. In some examples, the number of UE groups that may be supported may be 1 or 2 less than 3*X*Y for eMTC and 1 or 2 less than X*Y for NB-IoT, which may provide the remaining UE groups with a common WUS indication and / or WUS for Rel-15 UEs.

[0090] Considering different multiplexing options and possible combinations, the overall configuration of multiple MWUS transmissions for different UE groups is outlined below; various implementations may be employed to increase configuration flexibility.

[0091] Table 1 shows the configuration of the MTC wake-up signal (MWUS), which is defined in Rel-15 (TS 36.331) and broadcast in the cell as a part of the SI message.

[0092] Table 1: Rel-15 MWUS

[0093]

[0094]

[0095] Therefore, in an example, SIB signaling may configure additional US configurations corresponding to different WUS transmissions associated with one PO or a set of consecutive POs. In the following, for example, it is assumed that the WUS sequence generation is performed by performing a long Gold sequence The different parts of the implementation of scrambling are as described above. However, the following also applies to any other options for WUS sequence generation.

[0096] The configuration of each new WUS group may include one or more of the following:

[0097] (A) WUS group ID (ν), the range of which can be specified separately: 0-4 for eMTC (i.e., ), and for NB-IoT it is 0-3 (i.e., ). Alternatively, the maximum number of groups may be configured via SIB signaling. In various aspects, ν=0 may be reserved for Rel-15 WUS. The total number of WUS groups indicated by the network may optionally include a common group WUS, and the UE may determine the exact number of UE groups for WUS based on information about whether a common group WUS is configured in the cell.

[0098] (B) Starting PRB within narrowband (0, 2, 4) (applicable only to eMTC).

[0099] (C) maxDurationFactor, indicating the maximum number of repetitions for the WUS. In the example, this factor is specified in the same manner as that configured for the Rel-15 WUS. Alternatively, a single value of maxDurationFactor may be configured as a common value for all non-Rel-15 WUS groups. As yet another alternative, a maxDurationFactor value may be configured for each new WUS group.

[0100] (D) The timeOffset value in the PO (and thus the starting subframe) of a new WUS group may be indicated in the various ways described below in (1), (i) and (ii).

[0101] (1) For scenarios where at least all new WUSs have the same maxDurationFactor, a new parameter timeLocationIndex may be configured for each new WUS group to indicate the location of the WUS relative to the PO or relative to the Rel-15 WUS start subframe. Thus, a value of timeLocationIndex=0 may indicate that the location of this group is the latest WUS moment before the PO, timeLocationIndex=1 may indicate that the location of this group is just before the last WUS moment, and so on. In the example, the maximum value of timeLocationIndex may be specified as 2 or 3 (for eMTC) and 1 or 2 (for NB-IoT).

[0102] (i) If it is assumed that the Rel-15 WUS is the last WUS transmission before the PO, the relative position of the new WUS time can be determined based on the timeLocationIndex value and the maxDurationFactor of the Rel-15 WUS.

[0103] (ii) Generalize (i), where each group is configured with a separate maxDurationFactor and timeLoationIndex value, and all UEs using the UE group WUS feature can calculate the corresponding starting subframe for each WUS group.

[0104] The indication of a common group WUS may be achieved by reserving one of the group indices as the common group WUS, where all Rel-16 UEs supporting this feature should monitor the WUS in addition to the WUS in their corresponding UE group (as determined by UE-ID). Can be used to identify a common group WUS. Alternatively, v=1 can be used. Such a common group WUS can be optionally configured by the eNB, and when present, it can be configured to overlap with one of the UE groups in the physical time frequency resources.

[0105] The examples herein may include subject matter, such as a method, components for performing actions or blocks of the method, and at least one machine-readable medium including executable instructions that, when executed by a machine (e.g., a processor with memory, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), etc.), cause the machine to perform actions of a method or apparatus or system for concurrent communication using multiple communication technologies according to the described embodiments and examples.

[0106] Embodiment 1 is a device configured to be employed in a UE (user equipment), the device comprising: a memory interface; and a processing circuit, the processing circuit being configured to: determine a WUS group among multiple WUS groups, wherein the WUS group is associated with a first group of WUS (wake-up signal) among multiple groups of WUS; determine a starting subframe of the first group of WUS; and monitor the starting subframe of the first group of WUS, wherein the UE is configured to communicate via one or more of eMTC (enhanced machine type communication) or NB (narrowband)-IoT (Internet of Things).

[0107] Embodiment 2 includes the subject matter of any variation of any of Embodiment 1, wherein the processing circuit is further configured to process higher layer signaling configuring one or more parameters of the WUS group.

[0108] Embodiment 3 includes the subject matter of any variation of any of Embodiment 1, wherein the processing circuit is configured to determine the WUS group based on a UE ID (identifier) ​​of the UE.

[0109] Embodiment 4 includes the subject matter of any variation of any one of Embodiment 3, wherein the UE ID is the IMSI (International Mobile Subscriber Identity) of the UE.

[0110] Embodiment 5 includes the subject matter of any variation of any one of Embodiment 1, wherein physical resources of a first group of WUSs are multiplexed in the frequency domain with one or more other groups of WUSs among a plurality of groups of WUSs.

[0111] Embodiment 6 includes the subject matter of any variation of any one of Embodiment 5, wherein the UE is a BL (Bandwidth Reduced Low Complexity) / CE (Coverage Enhanced) DL UE, and wherein the physical resources of the first group of WUS are within a first narrowband of the configured multiple narrowbands.

[0112] Embodiment 7 includes the subject matter of any variation of any one of Embodiment 5, wherein the UE is a NB (Narrowband)-IoT (Internet of Things) UE, and wherein the physical resources of the first group of WUS are within a first carrier of the configured multiple carriers.

[0113] Embodiment 8 includes the subject matter of any variation of any one of Embodiment 1, wherein physical resources of the first group WUS are multiplexed in the time domain with one or more other groups WUS of the plurality of groups WUS.

[0114] Embodiment 9 includes the subject matter of any variation of any one of Embodiment 8, wherein physical resources of a first group WUS are multiplexed in the time domain with WUSs of one or more other UEs that do not support the group WUS.

[0115] Embodiment 10 includes the subject matter of any variation of any one of Embodiment 1, wherein physical resources of a first group WUS are shared with one or more other groups WUS among a plurality of groups WUS, and wherein the first group WUS and the one or more other groups WUS are multiplexed using quasi-orthogonal codes.

[0116] Embodiment 11 includes the subject matter of any variation of any one of Embodiment 1, wherein physical resources of a first group of WUSs are multiplexed with one or more other groups of WUSs in a plurality of groups of WUSs in at least two of frequency domain, time domain, or code domain.

[0117] Embodiment 12 includes the subject matter of any variation of any one of Embodiment 1, wherein the sequence of the first set of WUS is generated based on a RE-level Gold sequence, the RE-level Gold sequence being based on The RE-level Gold sequence is generated and is longer than the sequence of the first group of WUS, where is the number of WUS groups in the plurality of WUS groups.

[0118] Embodiment 13 includes the subject matter of any variation of any one of Embodiment 12, wherein the sequence of the first group of WUS is based on A subsequence of the RE-level Gold sequence generated, where the subsequence is shorter than Generated RE-level Gold sequence.

[0119] Embodiment 14 includes the subject matter of any variation of any one of Embodiment 1, wherein the sequence of the first group WUS is generated based on the WUS sequence of one or more other UEs that do not support the group WUS and based on a first time-domain OCC (orthogonal cover code) of length 11 applied to all subframes carrying the first group WUS.

[0120] Embodiment 15 includes the subject matter of any variation of any one of Embodiment 14, wherein the sequence of the first set of WUS is generated based on a first frequency-domain OCC of length 12 applied to each OFDM (Orthogonal Frequency Division Multiplexing) symbol of all subframes carrying the first set of WUS.

[0121] Embodiment 16 includes the subject matter of any variation of any of Embodiment 15, wherein the first time-domain OCC is One of the different time domain OCCs, where the first frequency domain OCC is One of the different frequency domain OCCs, and is the number of WUS groups in the plurality of WUS groups.

[0122] Embodiment 17 is a device configured to be employed in a gNB (next generation Node B), the device comprising: a memory interface; and a processing circuit, the processing circuit being configured to: determine a WUS group among multiple WUS groups, wherein the WUS group is associated with a first group of WUS (wake-up signal) among multiple groups of WUS; determine a starting subframe of the first group of WUS; generate a sequence of the first group of WUS; and map the sequence of the first group of WUS to one or more consecutive subframes starting from the starting subframe of the first group of WUS, wherein the first group of WUS is associated with one or more of eMTC (enhanced machine type communication) or NB (narrowband)-IoT (Internet of Things).

[0123] Embodiment 18 includes the subject matter of any variation of any of Embodiment 17, wherein the processing circuit is configured to generate a sequence of the first set of WUSs based on a RE-level Gold sequence based on The RE-level Gold sequence is generated and is longer than the sequence of the first group of WUS, where is the number of WUS groups in the plurality of WUS groups.

[0124] Embodiment 19 is a machine-readable medium comprising instructions which, when executed, cause a user equipment (UE) to: determine a WUS group among multiple WUS groups, wherein the WUS group is associated with a first group of WUS (wake-up signals) among the multiple WUS groups; determine a starting subframe of the first group of WUS; and monitor a starting subframe of the first group of WUS, wherein the UE is configured to communicate via one or more of eMTC (enhanced machine type communication) or NB (narrowband)-IoT (Internet of Things).

[0125] Embodiment 20 includes the subject matter of any variation of any of Embodiment 19, wherein the instructions, when executed, further cause the UE to process higher layer signaling configuring one or more parameters of the WUS group.

[0126] Embodiment 21 includes an apparatus including means for performing any of the operations described in embodiments 1 to 20.

[0127] Embodiment 22 includes a machine-readable medium storing instructions for execution by a processor to perform any of the operations described in embodiments 1 to 20.

[0128] Embodiment 23 includes an apparatus comprising: a memory interface; and a processing circuit configured to perform any of the operations described in embodiments 1 to 20.

[0129] The above description of the exemplary embodiments of the disclosed subject matter, including the contents described in the abstract, is not intended to be exhaustive or to limit the disclosed embodiments to the precise forms disclosed. Although specific embodiments and examples are described herein for illustrative purposes, various modifications can be considered within the scope of such embodiments and examples as can be appreciated by those skilled in the relevant art.

[0130] In particular, with respect to the various functions performed by the above-described components or structures (assemblies, devices, circuits, systems, etc.), unless otherwise specified, the terms used to describe such components (including references to "members") are intended to correspond to any component or structure that performs the specified functions of the components (e.g., functionally equivalent), even if not structurally equivalent to the disclosed structures that perform the functions in the exemplary implementations shown herein. In addition, while particular features have been disclosed with respect to only one of a plurality of implementations, for any given or particular application, such features may be combined with one or more other features of other implementations, which may be desirable and advantageous.

Claims

1. An apparatus configured to be employed in a user equipment UE, the apparatus comprising: A processing circuit, the processing circuit being configured to: Determine the starting subframe of the first time domain resource for monitoring the first group WUS of multiple group wake-up signals WUS as the latest subframe, so that before the start of the second time domain resource of another group WUS for the same paging time PO, there are a total of Lwus NB-IoT downlink subframes and subframes carrying system information block 1, i.e., SIB1-NB, wherein there are Lgap subframes from the end of the second time domain resource to the start of the PO, and wherein Lwus is the configured maximum WUS duration; as well as The starting subframe of the first time domain resource of the first group WUS is monitored. 2 . The apparatus of claim 1 , wherein the processing circuit is further configured to process higher layer signaling configuring one or more parameters of the first set of WUSs. 3 . The apparatus according to claim 1 , wherein the processing circuit is configured to determine a WUS group based on a UE identifier (ID) of the UE.

4. The apparatus of claim 3, wherein the UE ID is based on a modulo function of an International Mobile Subscriber Identity (IMSI) of the UE. 5 . The apparatus according to claim 1 , wherein physical resources of the first group WUS are multiplexed with one or more other groups WUS among the plurality of groups WUS in the frequency domain.

6. The apparatus of claim 5, wherein the UE is a reduced bandwidth low complexity BL / coverage enhanced CE DL UE, and wherein the physical resources of the first set of WUSs are within a first narrowband of a plurality of configured narrowbands.

7. The apparatus of claim 5, wherein the UE is a narrowband NB-Internet of Things (IoT) UE, and wherein the physical resources of the first set of WUSs are within a first carrier among a plurality of configured carriers. 8 . The apparatus according to claim 1 , wherein physical resources of the first group WUS are multiplexed with one or more other group WUSs of the plurality of group WUSs in a time domain. 9 . The apparatus of claim 8 , wherein the physical resources of the first group WUS are multiplexed in the time domain with WUSs of one or more other UEs that do not support group WUS.

10. The apparatus according to claim 1, wherein physical resources of the first group WUS are shared with one or more other groups WUS among the plurality of groups WUS, and wherein the first group WUS and the one or more other groups WUS are multiplexed using quasi-orthogonal codes. 11 . The apparatus according to claim 1 , wherein physical resources of the first group WUS are multiplexed with one or more other groups WUS among the plurality of groups WUS in at least two of frequency domain, time domain, or code domain.

12. The apparatus according to claim 1, wherein the sequence of the first group of WUS is generated based on a RE-level Gold sequence, wherein the RE-level Gold sequence is generated based on The RE-level Gold sequence is generated and is longer than the sequence of the first group of WUS, wherein is the number of groups WUS among the plurality of groups WUS.

13. The apparatus according to claim 12, wherein the sequence of the first set of WUS is based on A subsequence of the RE-level Gold sequence generated, wherein the subsequence is shorter than The generated RE-level Gold sequence.

14. The apparatus of claim 1, wherein a sequence of the first group WUS is generated based on a sequence of a WUS of one or more other UEs that do not support group WUS and based on a first time-domain orthogonal cover code (OCC) of length 11 applied to all subframes carrying the first group WUS. 15 . The apparatus of claim 14 , wherein the sequence of the first group of WUSs is generated based on a first frequency-domain OCC of length 12 applied to each orthogonal frequency division multiplexing (OFDM) symbol of all the subframes carrying the first group of WUSs.

16. The apparatus of claim 15, wherein the first time-domain OCC is one of different time-domain OCCs, wherein the first frequency-domain OCC is One of the different frequency domain OCCs, and is the number of groups WUS among the plurality of groups WUS.

17. The apparatus of claim 1, wherein Lgap is a configured minimum gap between an end of a maximum WUS signal duration and a start of the PO.

18. An apparatus configured to be employed in a base station, the apparatus comprising: A processing circuit, the processing circuit being configured to: Determine the starting subframe of the first time domain resource for monitoring the first group of wake-up signals WUS as the latest subframe, so that before the start of the second time domain resource of another group of WUS for the same paging time PO, there are a total of Lwus NB-IoT downlink subframes and subframes carrying system information block 1, i.e., SIB1-NB, wherein there are Lgap subframes from the end of the second time domain resource to the start of the PO, and wherein Lwus is the configured maximum WUS duration; generating a sequence of the first set of WUS; and The sequence of the first group of WUS is mapped to one or more subframes starting from the starting subframe on the first time domain resource of the first group of WUS.

19. The apparatus of claim 18, wherein Lgap is a configured minimum gap between an end of a maximum WUS signal duration and a start of the PO.

20. The apparatus of claim 18, wherein the processing circuit is configured to generate a sequence of the first group of WUSs based on a RE-level Gold sequence, wherein the RE-level Gold sequence is based on The RE-level Gold sequence is generated and is longer than the sequence of the first group of WUS, wherein is the number of group WUS in the plurality of group WUS.

21. A machine-readable medium comprising instructions which, when executed, cause a user to equip a UE with: Determine the starting subframe of the first time domain resource for monitoring the first group of wake-up signals WUS as the latest subframe, so that before the start of the second time domain resource for another group of WUS for the same paging time PO, there are a total of Lwus NB-IoT downlink subframes and subframes carrying system information block 1, i.e., SIB1-NB, wherein there are Lgap subframes from the end of the second time domain resource to the start of the PO, and wherein Lwus is the configured maximum WUS duration; and The starting subframe on the first time domain resource of the first group of WUS is monitored.

22. The machine-readable medium of claim 21, wherein Lgap is a configured minimum gap between an end of a maximum WUS signal duration and a start of the PO.

23. The machine-readable medium of claim 21, wherein the instructions, when executed, further cause the UE to process higher layer signaling that configures one or more parameters of the first set of WUSs.

24. The machine-readable medium of claim 21, wherein the instructions, when executed, further cause the UE to determine a WUS group based on a UE identifier (ID) of the UE.

25. The machine-readable medium of claim 24, wherein the UE ID is based on a modulo function of an International Mobile Subscriber Identity (IMSI) of the UE.

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