Configuring wake-up signals for accessing a wireless communications network
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2023-09-08
- Publication Date
- 2026-06-24
Smart Images
Figure CN2023117755_24102024_PF_FP_ABST
Abstract
Description
CONFIGURING WAKE-UP SIGNALS FOR ACCESSING A WIRELESS COMMUNICATIONS NETWORKTECHNICAL FIELD
[0001] This disclosure is directed generally to digital wireless communications.BACKGROUNDSUMMARY
[0002] Methods, systems, and devices are disclosed for configuring wake-up signals to access a wireless communications network. When a user equipment needs to access the network through a temporarily inactive access point, embodiments of the disclosed technology enable the user equipment to configure the transmission power and the length of the cyclic prefix of a wake-up signal that is sent to the access point. Upon receiving the wake-up signal, the access point starts an Synchronization Signal Block (SSB) beam scan, and subsequently, enables the user equipment to access the network.
[0003] In an example aspect, a wireless communication method includes transmitting, by a wireless device to a network including a plurality of access points, a wake-up signal, and receiving, from a second access point of the plurality of access points subsequent to the transmitting, the synchronization signal. In this example, the wake-up signal includes an orthogonal sequence, a reference sequence, a quasi-orthogonal sequence, or a sequence with the ID of one or more wireless devices, and a first access point of the plurality of access points is inactive or has ceased transmitting a synchronization signal.
[0004] In another example aspect, a wireless communication method includes transmitting, by a wireless device to a network, a wake-up signal, and receiving, from the network subsequent to the transmitting, the synchronization signal. In this example, the wake-up signal is indicative of at least one of the wireless device (a) requesting transmission of a synchronization signal by the network, (b) being unable to detect the synchronization signal, (c) being configured to receive the synchronization signal, (d) being configured to transmit the synchronization signal, or (e) requesting the network to prepare to detect the synchronization signal.
[0005] In yet another example aspect, a wireless communication method includes receiving, by an access point in a network including the access point and other access points, a wake-up signal from a wireless device, and transmitting, based on the receiving, a synchronization signal. In this example, the wake-up signal includes an orthogonal sequence, a reference sequence, a quasi-orthogonal sequence, or a sequence with the ID of one or more wireless devices, and the access point was inactive or had ceased transmitting the synchronization signal prior to the receiving the wake-up signal.
[0006] In yet another example aspect, a wireless communication method includes receiving, by a network from a wireless device, a wake-up signal, and transmitting, based on the receiving, the synchronization signal. In this example, the wake-up signal is indicative of at least one of the wireless device (a) requesting transmission of a synchronization signal by the network, (b) being unable to detect the synchronization signal, (c) being configured to receive the synchronization signal, (d) being configured to transmit the synchronization signal, or (e) requesting the network to prepare to detect the synchronization signal.
[0007] In yet another example aspect, the above-described methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium. The code included in the computer readable storage medium when executed by a processor, causes the processor to implement the methods described in this patent document.
[0008] In yet another exemplary embodiment, a device that is configured or operable to perform the above-described methods is disclosed.
[0009] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.
[0010] BRIEF DESCRIPTION OF THE DRAWING
[0011] FIG. 1 shows a flowchart for an example wireless communication method.
[0012] FIG. 2 shows a flowchart for another example wireless communication method.
[0013] FIG. 3 shows a block diagram of an example hardware platform that may be a part of a network device or a communication device.
[0014] FIG. 4 shows an example of wireless communication including a base station (BS) and user equipment (UE) based on some implementations of the disclosed technology.DETAILED DESCRIPTION
[0015] With the increase in the deployment density of access points (APs) , some APs might not be needed for certain periods of time, and may be configured to switch to an inactive state or cease transmitting a Signal Synchronization Block (SSB) in order to save power. Furthermore, an AP may be configured to cease transmitting an SSB when it is under the imperative to save energy and resources in the time-and / or frequency-domain.
[0016] Current wireless protocols define that the New Radio (NR) downlink synchronization channel and the synchronization signal include a few different kinds of SSB burst sets. Each SSB burst set include multiple SSBs, each SSB consisting of a Primary Synchronization Signal (PSS) , a Secondary Synchronization Signal (SSS) , and a Physical Broadcast Channel (PBCH) . To enhance the coverage of a cell when the AP tries to send the SSB to the UE, especially in high frequency scenarios, the standard has introduced beamforming. An NR system implements SSB beam coverage by using an SSB beam scan. When a UE tries to access the network, it accepts the SSB beams, and selects the beam that provides it with the best performance. The UE informs the AP of which SSB beam it selected by transmitting a specific preamble at a specific Random Access Channel (RACH) occasion (RO) corresponding to the selected SSB beam.
[0017] To mitigate the effects of multi-path propagation, which depend on the delay experienced by the signal, a cyclic prefix (CP) is introduced by the standard. The length of the CP is selected such that it exceeds the maximum delay experienced by the signal. Because the maximum delay is affected by the propagation distance of the signal, the length of the CP of the wake-up signal is also affected by this distance.
[0018] In accordance with the disclosed embodiments, if a user equipment (UE) needs to access the network through an AP that is adjacent to it, and the AP is either inactive or ceased transmitting the SSB, the UE needs to transmit a wake-up signal to the AP, which prompts the AP to start transmitting the SSB beam scan after it has received the wake-up signal from the UE. The UE is configured to control the transmission power of the wake-up signal if the wake-up signal is received by an AP that is distant from the UE and is not needed by the UE to access the network. Because the maximum delay experienced by a signal is affected by the propagation distance of the signal, the length of the cyclic prefix (CP) of the wake-up signal is determined by the distance between the UE and the farthest AP that the UE wants to invoke. Furthermore, because the transmission power of the wake-up signal is also determined by this distance, there is a relationship between the length of the CP of the wake-up signal and the transmission power of the wake-up signal.
[0019] The example headings for the various sections below are used to facilitate the understanding of the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section can be combined with one or more features of another example section. Furthermore, 5G terminology is used for the sake of clarity of explanation, but the techniques disclosed in the present document are not limited to 5G technology only, and may be used in wireless systems that implemented other protocols.
[0020] Embodiment 1
[0021] In some embodiments, a UE detects the SSB from AP1 and establishes downlink synchronization. The UE then transmits a preamble to AP1, but AP1 does not receive the preamble. In response, the UE transmits a wake-up signal to nearby APs that are inactive or have ceased transmitting the SSB. Then, AP1 indicates the expected distance that the wake-up signal must propagate and the step of increasing the expected distance. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0022] Embodiment 2
[0023] In some embodiments, a UE detects the SSB from AP1 and establishes downlink synchronization. The UE then transmits a preamble to AP1, but AP1 does not receive the preamble. In response, the UE transmits a wake-up signal to nearby APs that are inactive or have ceased transmitting the SSB. Then, AP1 indicates the transmission power that the wake-up signal must use and the step of increasing the transmission power. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0024] Embodiment 3
[0025] In some embodiments, a UE detects the SSB from AP1 and establishes downlink synchronization. The UE then transmits a preamble to AP1, but AP1 does not receive the preamble. In response, the UE transmits a wake-up signal to nearby APs that are inactive or have ceased transmitting the SSB. Then, AP1 indicates the length of the CP that the wake-up signal must use and the step of increasing the length of the CP. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0026] Embodiment 4
[0027] In some embodiments, a UE detects the SSB from AP1 and establishes downlink synchronization. The UE then transmits a preamble to AP1. AP1 detects the preamble that is transmitted by the UE, but AP1 is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0028] Then, the UE transmits the wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. Then, AP1 indicates the expected distance that the wake-up signal must propagate and the step of increasing the expected distance. This indication is transmitted by AP1 in SIB1.
[0029] Embodiment 5
[0030] In some embodiments, a UE detects the SSB from AP1 and establishes downlink synchronization. The UE then transmits a preamble to AP1. AP1 detects the preamble that is transmitted by the UE, but AP1 is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0031] Then, the UE transmits the wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. Then, AP1 indicates the transmission power that the wake-up signal must use and the step of increasing the transmission power. This indication is transmitted by AP1 in SIB1.
[0032] Embodiment 6
[0033] In some embodiments, a UE detects the SSB from AP1 and establishes downlink synchronization. The UE then transmits a preamble to AP1. AP1 detects the preamble that is transmitted by the UE, but AP1 is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0034] Then, the UE transmits the wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. Then, AP1 indicates the length of the CP that the wake-up signal must use and the step of increasing the length of the CP. This indication is transmitted by AP1 in SIB1.
[0035] Embodiment 7
[0036] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0037] – the UE cannot detect the SSB;
[0038] – the UE detects the SSB from an AP, but the quality of the SSB is very poor;
[0039] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0040] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0041] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects. Furthermore, the UE controls the expected distance that the signal must propagate to ensure that distant APs, which are not needed by the UE to access the network, are not invoked.
[0042] In some embodiments, there is a relationship between the length of the CP of the wake-up signal and the expected distance the wake-up signal must propagate. For example, the expected distance that the wake-up signal must propagate is selected from the set {d1, d2, d3} and the length of the CP of the wake-up signal is selected from the set {l1, l2, l3} , wherein l1, l2 and l3 correspond to d1, d2 and d3, respectively.
[0043] If the UE chooses d2 to be the expected distance that the wake-up signal must propagate, then the length of the CP used for the wake-up signal is l2. If the UE transmits the wake-up signal with an expected distance of d2 and a cyclic prefix length of l2, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the expected distance and the length of the CP. Herein, the UE increases the expected distance by ds, which is selected from the set {ds1, ds2, ds3} , and the length of the CP by ls, which is selected from the set {ls1, ls2, ls3} , wherein Ls1, Ls2 and Ls3 correspond to ds1, ds2 and ds3, respectively.
[0044] Embodiment 8
[0045] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0046] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0047] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0048] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects. Furthermore, the UE controls the expected distance that the signal must propagate to ensure that distant APs, which are not needed by the UE to access the network, are not invoked.
[0049] The AP that transmits the SSB will indicate to the UE the expected distance that the wake-up signal must propagate with signaling i1 and the step of increasing the expected distance with signaling i2. In an example, the value of i1 is selected from the set {i1-1, i1-2, i1-3} and the value of i2 is selected from the set {i2-1, i2-2, i2-3} . Herein, values {i1-1, i1-2, i1-3} correspond to values of the expected distance {d1, d2, d3} , respectively, and values {i2-1, i2-2, i2-3} correspond to values of the step of increasing the expected distance {ds1, ds2, ds3} .
[0050] Herein, the length of the CP of the wake-up signal is selected from the set {l1, l2, l3} , wherein l1, l2 and l3 correspond to d1, d2 and d3, respectively. Similarly, the step of increasing the length of the CP of the wake-up signal is selected from the set {ls1, ls2, ls3} , wherein ls1, ls2 and ls3 correspond to ds1, ds2 and ds3, respectively.
[0051] In an example, the AP indicating i1-2 and i2-2 to the UE results in the UE setting the expected distance that the wake-up signal must propagate to d2, the length of the CP of the wake-up signal to l2, the step of increasing the expected distance that the wake-up signal must propagate to ds2, and the step of increasing the length of the CP of the wake-up signal to ls2.
[0052] If the UE transmits the wake-up signal with an expected distance of d2 and a cyclic prefix length of l2, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the expected distance that the wake-up signal must propagate by ds2 and the length of the CP of the wake-up signal by ls2.
[0053] Embodiment 9
[0054] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0055] – the UE cannot detect the SSB;
[0056] – the UE detects the SSB from an AP, but the quality of the SSB is very poor;
[0057] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0058] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0059] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects. Furthermore, the UE controls the transmission power of the wake-up signal to ensure that distant APs, which are not needed by the UE to access the network, are not invoked.
[0060] In some embodiments, there is a relationship between the length of the CP of the wake-up signal and the transmission power of the wake-up signal. For example, the transmission power of the wake-up signal is selected from the set {p1, p2, p3} and the length of the CP of the wake-up signal is selected from the set {l1, l2, l3} , wherein l1, l2 and l3 correspond to p1, p2 and p3, respectively.
[0061] If the UE chooses p2 to be the transmission power of the wake-up signal, then the length of the CP used for the wake-up signal is l2. If the UE transmits the wake-up signal with a transmission power of p2 and a cyclic prefix length of l2, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the transmission power of the wake-up signal and the length of the CP. Herein, the UE increases the transmission power by ps, which is selected from the set {ps1, ps2, ps3} , and the length of the CP by ls, which is selected from the set {ls1, ls2, ls3} , wherein ls1, ls2 and ls3 correspond to ps1, ps2 and ps3, respectively.
[0062] Embodiment 10
[0063] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0064] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0065] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0066] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects. Furthermore, the UE controls the transmission power of the wake-up signal to ensure that distant APs, which are not needed by the UE to access the network, are not invoked.
[0067] The AP that transmits the SSB will indicate to the UE the transmission power of the wake-up signal with signaling i1 and the step of increasing the transmission power with signaling i2 in SIB1. In an example, the value of i1 is selected from the set {i1-1, i1-2, i1-3} and the value of i2 is selected from the set {i2-1, i2-2, i2-3} . Herein, values {i1-1, i1-2, i1-3} correspond to values of the transmission power {p1, p2, p3} , respectively, and values {i2-1, i2-2, i2-3} correspond to values of the step of increasing the expected distance {ps1, ps2, ps3} .
[0068] Herein, the length of the CP of the wake-up signal is selected from the set {l1, l2, l3} , wherein l1, l2 and l3 correspond to p1, p2 and p3, respectively. Similarly, the step of increasing the length of the CP of the wake-up signal is selected from the set {ls1, ls2, ls3} , wherein ls1, ls2 and ls3 correspond to ps1, ps2 and ps3, respectively.
[0069] In an example, the AP indicating i1-2 and i2-2 to the UE results in the UE setting the transmission power of the wake-up signal to p2, the length of the CP of the wake-up signal to l2, the step of increasing the transmission power of the wake-up signal to ps2, and the step of increasing the length of the CP of the wake-up signal to ls2.
[0070] If the UE transmits the wake-up signal with a transmission power of p2 and a cyclic prefix length of l2, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the transmission power of the wake-up signal by ps2 and the length of the CP of the wake-up signal by ls2.
[0071] Embodiment 11
[0072] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0073] – the UE cannot detect the SSB;
[0074] – the UE detects the SSB from an AP, but the quality of the SSB is very poor;
[0075] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0076] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0077] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects. Furthermore, the UE controls the length of the transmission of the wake-up signal to ensure that distant APs, which are not needed by the UE to access the network, are not invoked.
[0078] In some embodiments, there is a relationship between the length of the CP of the wake-up signal l and the length of the transmission of the wake-up signal t. For example, the length of the transmission of the wake-up signal is selected from the set {t1, t2, t3} , wherein t1＜t2＜t3, and the length of the CP of the wake-up signal is selected from the set {l1, l2, l3, l4} , wherein l1＜l2＜l3＜l4.
[0079] In an example, the UE selects the length of the CP based on the following rules:
[0080] – If t≤t1, set l=l1;
[0081] – If t1＜t≤t2, set l=l2;
[0082] – If t2＜t≤t3, set l=l3; and
[0083] – If t＞t3, set l=l4.
[0084] If the UE transmits the wake-up signal with a length of the transmission of the wake-up signal being t and the length of the CP of the wake-up signal being l, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the length of the transmission of the wake-up signal and the length of the CP of the wake-up signal. Herein, the UE increases the length of the transmission of the wake-up signal by ts, which is selected from the set {ts1, ts2, ts3} , and the length of the CP by ls, which is selected from the set {ls1, ls2, ls3} , wherein ls1, ls2 and ls3 correspond to ts1, ts2 and ts3, respectively.
[0085] Embodiment 12
[0086] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0087] – the UE cannot detect the SSB;
[0088] – the UE detects the SSB from an AP, but the quality of the SSB is very poor;
[0089] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0090] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0091] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects.
[0092] In some embodiments, there is a relationship between the length of the CP of the wake-up signal and the number of failures when invoking APs using the wake-up signal. For example, the number of failures when invoking APs using the wake-up signal is selected from the set {f1, f2, f3} and the length of the CP of the wake-up signal is selected from the set {l1, l2, l3} , wherein l1, l2 and l3 correspond to f1, f2 and f3, respectively.
[0093] If the UE chooses f2 to be the number of failures when invoking APs using the wake-up signal, then the length of the CP used for the wake-up signal is l2. If the UE transmits the wake-up signal with a number of failures when invoking APs using the wake-up signal of f2 and a cyclic prefix length of l2, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the number of failures when invoking APs and the length of the CP. Herein, the UE increases the number of failures when invoking APs using the wake-up signal by 1, and the length of the CP by ls, which is selected from the set {ls1, ls2, ls3} .
[0094] Embodiment 13
[0095] In some embodiments, a UE needs to access the network and one of the following situations exist:
[0096] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP, but the AP cannot detect the preamble; or
[0097] – the UE detects the SSB from an AP and establishes downlink synchronization. Then, the UE transmits a preamble to the corresponding AP. The corresponding AP detects the preamble that is transmitted by the UE, but the corresponding AP is engaged in other activities and cannot service the UE from which it received the preamble. In response, AP1 indicates to the UE that is should transmit the wake-up signal. This indication is transmitted by AP1 in a System Information Block 1 (SIB1) .
[0098] In these situations, the UE transmits a wake-up signal to invoke nearby APs that are either inactive or have ceased transmitting the SSB. A CP is added to the head of the wake-up signal to mitigate multi-path effects.
[0099] The AP that transmits the SSB will indicate to the UE the length of the CP of the wake-up signal with signaling i1 and the step of increasing the length of the CP of the wake-up signal with signaling i2 in SIB1. In an example, the value of i1 is selected from the set {i1-1, i1-2, i1-3} and the value of i2 is selected from the set {i2-1, i2-2, i2-3} . Herein, values {i1-1, i1-2, i1-3} correspond to values of the length of the CP {l1, l2, l3} , respectively, and values {i2-1, i2-2, i2-3} correspond to values of the step of increasing the length of the CP {ls1, ls2, ls3} .
[0100] In an example, the AP indicating i1-2 and i2-2 to the UE results in the UE setting the length of the CP of the wake-up signal to l2, and the step of increasing the length of the CP of the wake-up signal to ls2.
[0101] If the UE transmits the wake-up signal with a cyclic prefix length of l2, but cannot access the network (e.g., not detecting the SSB or not receiving confirmation from the corresponding AP when it has transmitted a preamble to that AP) , the UE is configured to increase the length of the CP of the wake-up signal by ls2.
[0102] Example methods and implementations of the disclosed technology
[0103] FIG. 1 shows a flowchart for an example wireless communication method 100. The method 100 includes, at operation 110, transmitting, by a wireless device to a network, a wake-up signal.
[0104] The method 100 includes, at operation 120, receiving, from the network subsequent to the transmitting, the synchronization signal.
[0105] FIG. 2 shows a flowchart for an example wireless communication method 200. The method 200 includes, at operation 210, receiving, by a network from a wireless device, a wake-up signal.
[0106] The method 200 includes, at operation 220, transmitting, based on the receiving, the synchronization signal.
[0107] The disclosed embodiments provide, inter alia, the following technical solutions:
[0108] 1. A wireless communication method, comprising: transmitting, by a wireless device to a network comprising a plurality of access points, a wake-up signal, wherein the wake-up signal comprises an an orthogonal sequence, a reference sequence, a quasi-orthogonal sequence, or a sequence with the ID of one or more wireless devices, and wherein a first access point of the plurality of access points is inactive or has ceased transmitting a synchronization signal; and receiving, from a second access point of the plurality of access points subsequent to the transmitting, the synchronization signal.
[0109] 2. A wireless communication method, comprising: transmitting, by a wireless device to a network, a wake-up signal, wherein the wake-up signal is indicative of at least one of: the wireless device requesting transmission of a synchronization signal by the network, being unable to detect the synchronization signal, being configured to receive the synchronization signal, being configured to transmit the synchronization signal, or requesting the network to prepare to detect the synchronization signal; and receiving, from the network subsequent to the transmitting, the synchronization signal.
[0110] 3. The method of solution 2, wherein the network comprises a plurality of access points.
[0111] 4. The method of solution 3, wherein a first access point of the plurality of access points is configured to receive the wake-up signal and transmit the synchronization signal.
[0112] 5. The method of solution 3, wherein a first access point of the plurality of access points is configured to receive the wake-up signal, and wherein a second access point of the plurality of access points is configured to transmit the synchronization signal.
[0113] 6. The method of any of solutions 2 to 5, wherein the wake-up signal includes an orthogonal sequence, a reference sequence, a quasi-orthogonal sequence, or a sequence with the ID of one or more wireless devices.
[0114] 7. The method of any of solutions 1 to 5, wherein the synchronization signal comprises a Synchronization Signal Block (SSB) , and wherein the first access point is configured to transmit the SSB upon receiving the wake-up signal.
[0115] 8. The method of solution 1, further comprising: detecting the synchronization signal; performing, based on the detecting, a downlink synchronization operation; and determining, subsequent to the performing, that access to the network is unavailable, wherein the wake-up signal is transmitted to the network subsequent to the determining.
[0116] 9. The method of any of solutions 1 to 8, further comprising: concatenating a cyclic prefix to a head of the wake-up signal.
[0117] 10. The method of solution 9, further comprising: receiving, from the network, a configuration comprising at least one of: an indication of whether the wireless device should transmit the wake-up signal, an indication of a transmission power to be used to transmit the wake-up signal, an indication of one or more values of transmission power boosting steps configured to increase the transmission power, an indication of a length of the cyclic prefix of the wake-up signal, an indication of one or more cyclic prefix length steps configured to increase the length of the cyclic prefix, an indication of a length of time of a transmission of the wake-up signal, an indication of a frequency-domain resource used by the wake-up signal, an indication of a time-domain resource used by the wake-up signal, or an indication of an interval between consecutive transmissions of the wake-up signal.
[0118] 11. The method of solution 10, wherein the configuration is received subsequent to a downlink synchronization operation being performed.
[0119] 12. The method of solution 11, wherein the configuration is received in a system information.
[0120] 13. The method of solution 10, further comprising: receiving, from the network, the indication of the transmission power to be used to transmit the wake-up signal; and determining, based on the indication, the length of the cyclic prefix using a mapping between the transmission power and the length of the cyclic prefix.
[0121] 14. The method of solution 10, further comprising: receiving, from the network, an indication of a value of a transmission power boosting step configured to increase the transmission power to be used to transmit the wake-up signal; and determining, based on the indication, a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between the value of the transmission power boosting step and the cyclic prefix length step.
[0122] 15. The method of solution 10, further comprising: determining the length of the cyclic prefix using a mapping between the transmission power to be used to transmit the wake-up signal and the length of the cyclic prefix; and determining a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between (a) a value of a transmission power boosting step configured to increase the transmission power to be used to transmit the wake-up signal and (b) the cyclic prefix length step.
[0123] 16. The method of solution 10, further comprising: determining the length of the cyclic prefix using a mapping between the length of time of the transmission of the wake-up signal and the length of the cyclic prefix; and determining a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between (a) a transmission time step configured to increase the length of time of the transmission of the wake-up signal and (b) the cyclic prefix length step.
[0124] 17. The method of solution 10, further comprising: determining the length of the cyclic prefix using a mapping between a number of invoking failures and the length of the cyclic prefix; and determining a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between (a) an increase of one in the number of invoking failures and (b) the cyclic prefix length step.
[0125] 18. A wireless communication method, comprising: receiving, by an access point in a network comprising the access point and other access points, a wake-up signal from a wireless device, wherein the wake-up signal comprises an an orthogonal sequence, a reference sequence, a quasi-orthogonal sequence, or a sequence with the ID of one or more wireless devices; and transmitting, based on the receiving, a synchronization signal, wherein the access point was inactive or had ceased transmitting the synchronization signal prior to the receiving the wake-up signal.
[0126] 19. A wireless communication method, comprising: receiving, by a network from a wireless device, a wake-up signal, wherein the wake-up signal is indicative of at least one of: the wireless device requesting transmission of a synchronization signal by the network, being unable to detect the synchronization signal, being configured to receive the synchronization signal, being configured to transmit the synchronization signal, or requesting the network to prepare to detect the synchronization signal; and transmitting, based on the receiving, the synchronization signal.
[0127] 20. The method of solution 19, wherein the network comprises a plurality of access points.
[0128] 21. The method of solution 20, wherein a first access point of the plurality of access points is configured to receive the wake-up signal and transmit the synchronization signal.
[0129] 22. The method of solution 20, wherein a first access point of the plurality of access points is configured to receive the wake-up signal, and wherein a second access point of the plurality of access points is configured to transmit the synchronization signal.
[0130] 23. The method of any of solutions 18 to 22, wherein the synchronization signal comprises a Synchronization Signal Block (SSB) , and wherein the access point is configured to transmit the SSB upon receiving the wake-up signal.
[0131] 24. The method of any of solutions 18 to 23, wherein the network is configured to transmit, to the wireless device, an indication of at least one of: whether the wireless device should transmit the wake-up signal, a transmission power of the wake-up signal, a length of a cyclic prefix of the wake-up signal, a length of time of a transmission of the wake-up signal, a frequency-domain resource used by the wake-up signal, a time-domain resource used by the wake-up signal, an interval between consecutive transmissions of the wake-up signal, a value of a transmission power boosting step configured to increase the transmission power to be used to transmit the wake-up signal, a cyclic prefix length step configured to increase the length of the cyclic prefix, or a transmission time step configured to increase the length of time of the transmission of the wake-up signal.
[0132] 25. The method of solution 24, wherein the indication is transmitted subsequent to a downlink synchronization operation being performed.
[0133] 26. The method of any of solutions 19 to 25, wherein the wake-up signal includes an orthogonal sequence, a reference sequence, a quasi-orthogonal sequence, or a sequence with the ID of one or more wireless devices.
[0134] 27. An apparatus for wireless communication comprising a processor, configured to implement a method recited in one or more of solutions 1 to 26.
[0135] 28. A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by a processor, causing the processor to implement a method recited in one or more of solutions 1 to 26.
[0136] FIG. 3 shows a block diagram of an example hardware platform 300 that may be a part of a network device (e.g., base station) or a communication device (e.g., a user equipment (UE) ) . The hardware platform 300 includes at least one processor 310 and a memory 305 having instructions stored thereupon. The instructions upon execution by the processor 310 configure the hardware platform 300 to perform the operations described in FIGS. 1 and 2 and in the various embodiments described in this patent document. The transmitter 315 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user equipment. The receiver 320 receives information or data transmitted or sent by another device. For example, a user equipment can receive a message from a network device.
[0137] The implementations as discussed above will apply to a wireless communication. FIG. 4 shows an example of a wireless communication system (e.g., a 5G or NR cellular network) that includes a base station 420 and one or more user equipment (UE) 411, 412 and 413. In some embodiments, the UEs access the BS (e.g., the network) using a communication link to the network (sometimes called uplink direction, as depicted by dashed arrows 431, 432, 433) , which then enables subsequent communication (e.g., shown in the direction from the network to the UEs, sometimes called downlink direction, shown by arrows 441, 442, 443) from the BS to the UEs. In some embodiments, the BS send information to the UEs (sometimes called downlink direction, as depicted by arrows 441, 442, 443) , which then enables subsequent communication (e.g., shown in the direction from the UEs to the BS, sometimes called uplink direction, shown by dashed arrows 431, 432, 433) from the UEs to the BS. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, an Internet of Things (IoT) device, and so on.
[0138] Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0139] Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and / or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and / or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and / or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0140] While this document contains many specifics, these should not be construed as limitations on the scope of an invention that is claimed or of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features that are described in this document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination. Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.
[0141] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this disclosure.
Claims
1.A wireless communication method, comprising:transmitting, by a wireless device to a network comprising a plurality of access points, a wake-up signal, wherein the wake-up signal comprises an orthogonal sequence or a reference sequence, and wherein a first access point of the plurality of access points is inactive or has ceased transmitting a synchronization signal; andreceiving, from a second access point of the plurality of access points subsequent to the transmitting, the synchronization signal.2.A wireless communication method, comprising:transmitting, by a wireless device to a network, a wake-up signal,wherein the wake-up signal is indicative of at least one of:the wireless devicerequesting transmission of a synchronization signal by the network,being unable to detect the synchronization signal,being configured to receive the synchronization signal,being configured to transmit the synchronization signal, orrequesting the network to prepare to detect the synchronization signal; andreceiving, from the network subsequent to the transmitting, the synchronization signal.3.The method of claim 2, wherein the network comprises a plurality of access points.4.The method of claim 3, wherein a first access point of the plurality of access points is configured to receive the wake-up signal and transmit the synchronization signal.5.The method of claim 3, wherein a first access point of the plurality of access points is configured to receive the wake-up signal, and wherein a second access point of the plurality of access points is configured to transmit the synchronization signal.6.The method of any of claims 1 to 5, wherein the synchronization signal comprises a Synchronization Signal Block (SSB) , and wherein the first access point is configured to transmit the SSB upon receiving the wake-up signal.7.The method of claim 1, further comprising:detecting the synchronization signal;performing, based on the detecting, a downlink synchronization operation; anddetermining, subsequent to the performing, that access to the network is unavailable,wherein the wake-up signal is transmitted to the network subsequent to the determining.8.The method of any of claims 1 to 7, further comprising:concatenating a cyclic prefix to a head of the wake-up signal.9.The method of claim 8, further comprising:receiving, from the network, a configuration comprising at least one of:an indication of whether the wireless device should transmit the wake-up signal,an indication of a transmission power to be used to transmit the wake-up signal,an indication of one or more values of transmission power boosting steps configured to increase the transmission power,an indication of a length of the cyclic prefix of the wake-up signal,an indication of one or more cyclic prefix length steps configured to increase the length of the cyclic prefix,an indication of a length of time of a transmission of the wake-up signal,an indication of a frequency-domain resource used by the wake-up signal,an indication of a time-domain resource used by the wake-up signal, oran indication of an interval between consecutive transmissions of the wake-up signal.10.The method of claim 9, wherein the configuration is received subsequent to a downlink synchronization operation being performed.11.The method of claim 10, wherein the configuration is received in a system information.12.The method of claim 9, further comprising:receiving, from the network, the indication of the transmission power to be used to transmit the wake-up signal; anddetermining, based on the indication, the length of the cyclic prefix using a mapping between the transmission power and the length of the cyclic prefix.13.The method of claim 9, further comprising:receiving, from the network, an indication of a value of a transmission power boosting step configured to increase the transmission power to be used to transmit the wake-up signal; anddetermining, based on the indication, a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between the value of the transmission power boosting step and the cyclic prefix length step.14.The method of claim 9, further comprising:determining the length of the cyclic prefix using a mapping between the transmission power to be used to transmit the wake-up signal and the length of the cyclic prefix; anddetermining a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between (a) a value of a transmission power boosting step configured to increase the transmission power to be used to transmit the wake-up signal and (b) the cyclic prefix length step.15.The method of claim 9, further comprising:determining the length of the cyclic prefix using a mapping between the length of time of the transmission of the wake-up signal and the length of the cyclic prefix; anddetermining a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between (a) a transmission time step configured to increase the length of time of the transmission of the wake-up signal and (b) the cyclic prefix length step.16.The method of claim 9, further comprising:determining the length of the cyclic prefix using a mapping between a number of invoking failures and the length of the cyclic prefix; anddetermining a cyclic prefix length step configured to increase the length of the cyclic prefix using a mapping between (a) an increase of one in the number of invoking failures and (b) the cyclic prefix length step.17.A wireless communication method, comprising:receiving, by an access point in a network comprising the access point and other access points, a wake-up signal from a wireless device, wherein the wake-up signal comprises an orthogonal sequence or a reference sequence; andtransmitting, based on the receiving, a synchronization signal,wherein the access point was inactive or had ceased transmitting the synchronization signal prior to the receiving the wake-up signal.18.A wireless communication method, comprising:receiving, by a network from a wireless device, a wake-up signal,wherein the wake-up signal is indicative of at least one of:the wireless devicerequesting transmission of a synchronization signal by the network,being unable to detect the synchronization signal,being configured to receive the synchronization signal,being configured to transmit the synchronization signal, orrequesting the network to prepare to detect the synchronization signal; andtransmitting, based on the receiving, the synchronization signal.19.The method of claim 18, wherein the network comprises a plurality of access points.20.The method of claim 19, wherein a first access point of the plurality of access points is configured to receive the wake-up signal and transmit the synchronization signal.21.The method of claim 19, wherein a first access point of the plurality of access points is configured to receive the wake-up signal, and wherein a second access point of the plurality of access points is configured to transmit the synchronization signal.22.The method of any of claims 17 to 21, wherein the synchronization signal comprises a Synchronization Signal Block (SSB) , and wherein the access point is configured to transmit the SSB upon receiving the wake-up signal.23.The method of any of claims 17 to 22, wherein the network is configured to transmit, to the wireless device, an indication of at least one of: whether the wireless device should transmit the wake-up signal, a transmission power of the wake-up signal, a length of a cyclic prefix of the wake-up signal, a length of time of a transmission of the wake-up signal, a frequency-domain resource used by the wake-up signal, a time-domain resource used by the wake-up signal, an interval between consecutive transmissions of the wake-up signal, a value of a transmission power boosting step configured to increase the transmission power to be used to transmit the wake-up signal, a cyclic prefix length step configured to increase the length of the cyclic prefix, or a transmission time step configured to increase the length of time of the transmission of the wake-up signal.24.The method of claim 23, wherein the indication is transmitted subsequent to a downlink synchronization operation being performed.25.An apparatus for wireless communication comprising a processor, configured to implement a method recited in one or more of claims 1 to 24.26.A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by a processor, causing the processor to implement a method recited in one or more of claims 1 to 24.