Methods, apparatuses, devices, and computer readable media for wireless communication

Abstract

Methods, apparatuses, devices, and computer readable media for wireless communication are described. Methods and apparatuses for transmitting and detecting channel reservation preambles in NR shared spectrum are described. One aspect can include determining whether a first reservation preamble of a first operator is received from a first network entity on a first slot of a plurality of slots of a downlink channel and transmitting a second reservation preamble of the first operator to a second network entity on an uplink channel. Another aspect can include generating the first reservation preamble of the first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a CAZAC sequence; and transmitting the first reservation preamble of the first operator to at least a UE on the first slot of the plurality of slots of the downlink channel. In another aspect, SFN transmission of first and second reservation preambles and low latency detection methods of these reservation preambles are disclosed.

Description

[0001] This Patent Application is a Continuation-in-Part of International Application No. PCT / US2017 / 061604, International Filing Date November 14, 2017, entitled "Techniques for Reservation Preamble for Low Latency Detection in a New Radio Shared Spectrum Communication System," assigned to the assignee hereof, and claims priority to U.S. Non-Provisional Application No. 15 / 811,138, filed November 13, 2017, entitled "Techniques for Reservation Preamble for Low Latency Detection in a New Radio Shared Spectrum Communication System," and U.S. Provisional Application No. 62 / 422,919, filed November 16, 2016, entitled "Techniques for Reservation Preamble for Low Latency Detection in a New Radio Shared Spectrum Communication System," both of which are assigned to the assignee hereof and hereby expressly incorporated by reference herein in their entirety.

[0002] Cross Reference to Related Applications

[0003] This Patent Application claims priority to U.S. Non-Provisional Application No. 15 / 811,138, filed November 13, 2017, entitled "Techniques for Reservation Preamble for Low Latency Detection in a New Radio Shared Spectrum Communication System," and U.S. Provisional Application No. 62 / 422,919, filed November 16, 2016, entitled "Techniques for Reservation Preamble for Low Latency Detection in a New Radio Shared Spectrum Communication System," both of which are assigned to the assignee hereof and hereby expressly incorporated by reference herein in their entirety. TECHNICAL FIELD

[0004] Aspects of the present disclosure relate generally to wireless communication networks, and more particularly to methods, apparatuses, devices, and computer readable media for wireless communication, and more particularly to techniques for reservation preamble for low latency detection in a new radio shared spectrum wireless communication network. BACKGROUND

[0005] Wireless communication networks are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication networks can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems.

[0006] These multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different wireless devices to communicate on a municipal, national, regional, and even global level. For example, a fifth generation (5G) new radio (NR) communication technology is designed to extend and support diverse usage scenarios and applications falling into three high-level performance categories: eMBB (enhanced mobile broadband), URLLC (ultra-reliable low-latency communication), and massive MTC (massive machine type communications). However, as the demand for mobile broadband access continues to increase, there exists a need for improvements in 5G communication technologies and beyond. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

[0007] As the number of transmitted packets increases with 5G, techniques are needed to provide efficient and improved procedures when communicating frames during wireless communications. In certain instances, with the advent of next generation wireless communications, more flexible transmissions can be desired to ensure sufficient or improved levels of wireless communications. Thus, improvements in communications during wireless communications are desirable. SUMMARY

[0008] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0009] According to an aspect, a method includes low latency detection by a user equipment (UE) with reservation preambles in a new radio communication system. The described aspects include determining whether a first reservation preamble of a first operator is received from a first network entity on a first slot of a plurality of slots of a downlink channel. The described aspects further include transmitting a second reservation preamble of the first operator to a second network entity on an uplink channel based on determining that the first reservation preamble of the first operator is received.

[0010] In an aspect, an apparatus for low latency detection by a UE with reservation preambles in a new radio communication system can include a transceiver, a memory, and at least one processor coupled to the memory and configured to determine whether a first reservation preamble of a first operator is received from a first network entity on a first slot of a plurality of slots of a downlink channel.

[0011] The described aspects further include transmitting, based on a determination that the first reservation preamble of the first operator is received, a second reservation preamble of the first operator to a second network entity on an uplink channel.

[0012] In an aspect, a computer-readable medium can store computer executable code for low latency detection with reservation preambles by a UE in a new radio communication system is described. The described aspects include code for determining whether a first reservation preamble of a first operator is received from a first network entity on a first time slot of a plurality of time slots of a downlink channel. The described aspects further include code for transmitting, based on a determination that the first reservation preamble of the first operator is received, a second reservation preamble of the first operator to a second network entity on an uplink channel.

[0013] In an aspect, an apparatus for low latency detection with reservation preambles by a UE in a new radio communication system is described. The described aspects include means for determining whether a first reservation preamble of a first operator is received from a first network entity on a first time slot of a plurality of time slots of a downlink channel. The described aspects further include means for transmitting, based on a determination that the first reservation preamble of the first operator is received, a second reservation preamble of the first operator to a second network entity on an uplink channel.

[0014] According to an aspect, a method includes low latency detection with reservation preambles by a network entity in a new radio communication system. The described aspects include generating a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a constant amplitude zero auto correlation (CAZAC) sequence. The described aspects further include transmitting the first reservation preamble of the first operator to at least a UE on a first time slot of a plurality of time slots of a downlink channel.

[0015] In an aspect, an apparatus for low latency detection with reservation preambles by a network entity in a new radio communication system can include a transceiver, a memory, and at least one processor coupled to the memory and configured to generate a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a CAZAC sequence. The described aspects further include transmitting the first reservation preamble of the first operator to at least a UE on a first time slot of a plurality of time slots of a downlink channel.

[0016] In one aspect, a computer-readable medium that can store computer executable code for low latency detection by a UE with reservation preambles in a new radio communication system is described. The described aspects include code for generating a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a CAZAC sequence. The described aspects further include code for transmitting the first reservation preamble of the first operator to at least the UE on a first slot of a plurality of slots of a downlink channel.

[0017] In one aspect, an apparatus for low latency detection by a UE with reservation preambles in a new radio communication system is described. The described aspects include means for generating a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a CAZAC sequence. The described aspects further include means for transmitting the first reservation preamble of the first operator to at least the UE on a first slot of a plurality of slots of a downlink channel.

[0018] Various aspects and features of the disclosure are described below in greater detail in reference to various examples thereof as illustrated in the accompanying drawings. While the disclosure is described below in reference to various examples, it should be understood that the disclosure is not limited thereto. Those of ordinary skill in the art having access to the teachings herein will realize additional implementations, modifications, and examples, as well as other uses of the disclosure, that are within the scope of the disclosure as described herein. BRIEF DESCRIPTION OF DRAWINGS

[0019] The features, nature, and advantages of the present disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout and wherein broken lines can indicate optional components or acts, and wherein:

[0020] Figure 1 is a schematic diagram of an example of a wireless communication network including at least one base station having a reservation preamble transmission component and at least one UE having a preamble relay component.

[0021] Figure 2 is a flow diagram illustrating an example of a method of communication in a wireless communication system, in accordance with one or more aspects of the present disclosure.

[0022] Figure 3 is a flow diagram illustrating an example of a method of wireless communication at a network entity, in accordance with one or more aspects of the present disclosure.

[0023] Figure 4 is a conceptual diagram of an example of a transmission opportunity, in accordance with one or more aspects of the present disclosure.

[0024] Figure 5 is a conceptual diagram of an example of a transmission opportunity in accordance with one or more aspects of the present disclosure.

[0025] Figure 6 is a conceptual diagram of an example of a reservation preamble with a configurable switching gap in accordance with one or more aspects of the present disclosure.

[0026] Figure 7 is a conceptual diagram of an example of a scenario for frequency mapping of reservation preamble tones in accordance with one or more aspects of the present disclosure.

[0027] Figure 8 is a conceptual diagram of an example of a transmission scenario in accordance with one or more aspects of the present disclosure.

[0028] Figure 9 is a conceptual diagram of an example of a transmission scenario in accordance with another aspect of the present disclosure.

[0029] Figure 10 is a conceptual diagram of an example of a transmission scenario in accordance with one or more aspects of the present disclosure.

[0030] Figure 11 is a schematic diagram of example components of a UE of Figure 1

[0031] Figure 12 is a schematic diagram of example components of a base station of Figure 1 DETAILED DESCRIPTION

[0032] The detailed description set forth below, in connection with the appended drawings and embodiments described herinin, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein can be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known components are shown in block diagram form in order to avoid obscuring the concepts being described herein. In an aspect, the term "component" as used herein can be one of the parts that make up a system, can be hardware or software, and can be divided into other components.

[0033] ​​The aspects of this disclosure generally relate to frame structures for new radio-shared spectrum. Specifically, conventional implementations may not be well-suited to facilitating communication between user equipment (UE) and network entities supporting multiple operators. For example, an operator may be, or otherwise corresponds to, a provider of a radio service. Specifically, conventional implementations may inefficiently utilize available spectrum associated with a particular radio access technology (RAT) across multiple operators, or may be unable to utilize available spectrum in conjunction with another operator. Thus, frame structures that allow or otherwise facilitate communication among multiple operators may be desirable. For example, such frame structures could provide media access shared by multiple operators in a new radio-shared spectrum system.

[0034] Furthermore, media access in various spectrums (such as, but not limited to, unlicensed spectrum) can utilize a Listen-Before-Talk (LBT) scheme to monitor unlicensed or shared channels to prevent or mitigate interference to another RAT and / or another operator. For example, LBT can be performed via energy detection or preamble detection, and in some aspects, it can utilize random backoff. However, implementing LBT in a multi-RAT environment involving various operators can encounter several drawbacks, such as the high overhead associated with random backoff, the probability of collisions when the consecutive carrier aggregation (CCA) counters of at least two network entities reach zero in the same CCA time slot, and problems associated with hiding network entities and spatial reuse. Accordingly, to overcome these drawbacks, synchronization can be provided across various network entities (e.g., eNBs). Specifically, to achieve such synchronization, aspects of this disclosure provide a priority-based media contention scheme for one or more frequency bands that may or may not have an LBT scheme. For example, the scheme includes a reserved preamble associated with a specific operator that can be transmitted by a network entity to notify one or more network entities (e.g., eNBs) of other operators that the network entity will occupy a medium or channel during a given transmission opportunity (e.g., over a time duration of several symbols). In some instances, certain network entities may have a higher assigned priority than other network entities.

[0035] Accordingly, in some aspects, the methods and apparatuses of the present disclosure can provide an efficient solution by utilizing reservation preambles associated with different operators to announce to other operators a reservation of at least one transmission opportunity of a given frame in a new radio shared spectrum as compared to conventional solutions. In other words, in aspects of the present disclosure, a UE can efficiently and effectively determine whether a first reservation preamble of a first operator is received from a first network entity on a first time slot of a plurality of time slots of a downlink channel, and transmit a second reservation preamble of the first operator to a second network entity on an uplink channel based on a determination that the first reservation preamble of the first operator is received. Moreover, aspects of the present disclosure provide one or more mechanisms for causing a first network entity to generate a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a constant amplitude zero auto correlation (CAZAC) sequence, and transmit the first reservation preamble of the first operator to at least a UE on a first time slot of a plurality of time slots of a downlink channel.

[0036] Additional features of the aspects of the present disclosure are described in more detail below with reference to Figures 1-12

[0037] It should be noted that the techniques described herein can be used for various wireless communication networks such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other networks. The terms“system” and“network” are often used interchangeably. A CDMA system can implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 Release 0 and A are commonly referred to as CDMA2000 IX, IX, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 lxEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA system can implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). 3GPP Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, UMTS, LTE, and GSM are described in documents from an organization named“3rd Generation Partnership Project” (3GPP). CDMA2000 IX, IX, UMB, and HRPD are described in documents from an organization named“3rd Generation Partnership Project 2” (3GPP2). The techniques described herein can be used for the wireless networks and radio technologies mentioned above, as well as other wireless networks and radio technologies. For clarity, the term“network” here can include wired or wireless communications networks that are owned and / or operated by the same or different service providers. TM ​Radio technologies such as UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-A Advanced (LTE-A) are newer versions of UMTS using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the Third Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization called the Third Generation Partnership Project 2 (3GPP2). The technologies described herein can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies, including cellular (e.g., LTE) communications sharing a radio spectrum band. However, the following description describes LTE / LTE-A systems for illustrative purposes, and LTE terminology is used in most of the following description, but these technologies can also be applied beyond LTE / LTE-A applications (e.g., to 5G networks or other next-generation communication systems).

[0038] The following description provides examples and is not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the elements discussed without departing from the scope of this disclosure. Various procedures or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to some examples may be combined in other examples.

[0039] Reference Figure 1According to various aspects of the present disclosure, example wireless communication networks 100 include at least one UE 110 having a modem 140 with a preamble relay component 150 that can be configured to facilitate reception of reservation preambles from network entities (such as base stations 105 in the wireless communication network 100) on one or more downlink communication channels according to a new radio shared spectrum frame structure. Further, the at least one base station 105 includes a modem 160 with a reservation preamble transmission component 170 that transmits a reservation preamble for a particular operator via a communication channel 135 based on an indication that the particular operator will transmit data on at least one transmission opportunity of a frame 133. For example, the preamble relay component 150 can receive a first reservation preamble 152 for a first operator 112 on a downlink channel from a first network entity (e.g., base station 105) and transmit a second reservation preamble 154 for the first operator 112 on an uplink channel (e.g., communication channel 136) to a second network entity (e.g., base station 106). Further, the reservation preamble transmission component 170 can generate the first reservation preamble 152 for the first operator 112 based on at least one of a compressed representation in signal space, a basis function of signal space, or a constant amplitude zero auto correlation waveform (CAZAC) sequence.

[0040] In an aspect, a UE 110 can include a preamble relay component 150 that can be configured to facilitate reception of reservation preambles from network entities (such as base stations 105) on one or more downlink communication channels according to a new radio shared spectrum frame structure. For example, referring to Figure 5 A reservation preamble associated with a particular operator (e.g., the first operator 112) can notify or otherwise indicate to one or more network entities (e.g., base station 106) associated with a different operator that the base station 105 will transmit data on a transmission opportunity (e.g., formed by a number of subframes having a uniform time duration). However, in some cases, a network entity (e.g., base station 106) can be hidden from or remain undetected by the transmitting network entity (i.e., base station 105), and as such, the reservation preamble can not be received by the potentially interfering network entity (e.g., base station 106). As such, the UE 110 can transmit a reservation preamble to one or more network entities (e.g., base station 106) that can potentially interfere with the transmissions of the network entity in a transmission opportunity associated with the reservation preamble. In some aspects, the UE 110 can transmit one or more transmission opportunities within a frame 133 according to a frame structure that facilitates transmissions on subframes or symbols associated with multiple or different operators, as Figure 5 illustrated in FIG. 3.

[0041] In particular, to facilitate network synchronization, the preamble relay component 150 can be configured to determine whether a first reservation preamble 152 of the first operator 112 is received from a first base station 105 (e.g., which can be a serving eNB) on a first time slot of a plurality of time slots of a downlink channel 135. For example, the determination component 156 can determine whether the first reservation preamble 152 of the first operator 112 is received by partitioning a receiver time frame into a plurality of segments each having a maximum time duration, accumulating one or more segments of the plurality of segments that correspond to a portion of the first reservation preamble 152, applying a non-coherent cross-correlation operation to each of the accumulated one or more segments, and combining each output of the non-coherent cross-correlation operation to trigger detection of the first reservation preamble 152. In some aspects, the non-coherent cross-correlation operation corresponds to at least one of a time-domain non-coherent cross-correlation operation or a frequency-domain non-coherent cross-correlation operation.

[0042] In some aspects, the UE 110 and / or the preamble relay component 150 can be configured to determine a ratio of a time duration of the second reservation preamble 154 to a time duration of a handover gap. In some examples, the second reservation preamble 154 is aligned with a time slot boundary of the first time slot. In an example, a sequence of the second reservation preamble 154 corresponds to at least one of a punctured or phase-rotated waveform of the first reservation preamble 152.

[0043] In an aspect, the UE 110 and / or the preamble relay component 150 can execute the transceiver 60 to transmit, based on determining that the first reservation preamble 152 of the first operator 112 is received, a second reservation preamble 154 of the first operator 112 to a second base station 106 on an uplink channel 136. In an example, the transceiver 502 can transmit the second reservation preamble 154 at a transmission time corresponding to a completion time of determining that the first reservation preamble 152 of the first operator 112 is received. In some examples, an end time of the second reservation preamble 154 corresponds to an end time of the first reservation preamble 152, the end time of the second reservation preamble 154 and the end time of the first reservation preamble 152 are aligned with a time slot boundary of the first time slot.

[0044] In some aspects, the UE 110 and / or the preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 as a single frequency network (SFN) transmission based on both the UE 110 and the first base station 105 corresponding to the first operator 112.

[0045] In some aspects, the UE 110 includes a plurality of transmit antennas 64-a through 64-b. Further, the UE 110 and / or preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 on the plurality of transmit antennas 64-a through 64-b by reusing the OFDM frame. Additionally, the UE 110 and / or preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 based on a configurable transmit diversity scheme. For example, the configurable transmit diversity scheme includes at least one of tone interlacing in the frequency domain, sub-band interlacing in the frequency domain, or cyclic shift diversity in the time domain.

[0046] Further, the UE 110 (and particularly the preamble relay component 150) can configure the frame structure of the frame 133 based on frame configuration information received from the base station 105. For example, the preamble relay component 150 can be configured to receive an indication including a number of operators from the base station 105 and determine a transmission opportunity structure including at least one uplink slot based on the number of operators from the base station 105. Accordingly, the preamble relay component 150 can be configured to transmit the second reservation preamble 154 of the first operator 112 to a second network entity during the at least one uplink listen-before-talk slot. Further, the UE 110 (and particularly the preamble relay component 150) can be configured to receive at least one of a duration or a priority of one or more transmission opportunities and forego monitoring one or more slots.

[0047] In an aspect, the base station 105 and / or reservation preamble transmission component 170 can execute the transceiver 602 to transmit a first reservation preamble 152 of a first operator to at least the UE 110 on a first slot of a plurality of slots of the downlink channel 135. For example, the transceiver 602 can transmit a plurality of uniformly spaced pilot tones corresponding to the first reservation preamble 152. For example, the base station 105 and / or reservation preamble transmission component 170 can execute the transceiver 602 to transmit the first reservation preamble 152 as a single frequency network (SFN) transmission based on both the UE 110 and the first base station 105 corresponding to the first operator 112. In another example, the transceiver 602 can transmit data associated with the first operator 112 on the downlink channel 135 within a portion of a transmission opportunity in response to transmitting the first reservation preamble 152 of the first operator 112. In some examples, the first reservation preamble 152 of the first operator 112 informs at least one of the UEs served by the first base station 105 and the second base station 106 that the first base station 105 will access the channel 135 during the portion of the transmission opportunity. In other examples, the reservation preamble 152 can limit access to the portion of the transmission opportunity by one or more network entities, including at least one of the second base station 106, based on a determination that the first reservation preamble 152 of the first operator 112 has been transmitted by at least the first base station 105.

[0048] In some aspects, the first network entity includes a plurality of transmit antennas 665. Further, the base station 105 and / or reservation preamble transmission component 170 can execute the transceiver 602 to transmit the first reservation preamble 152 on the plurality of transmit antennas 665 by reusing an OFDM frame. Additionally, the base station 105 and / or reservation preamble transmission component 170 can execute the transceiver 602 to transmit the first reservation preamble 152 based on a configurable transmit diversity scheme. In an example, the configurable transmit diversity scheme includes at least one of tone interlacing in a frequency domain, subband interlacing in a frequency domain, or cyclic shift diversity in a time domain.

[0049] In an aspect, the base station 106 and / or reservation preamble transmission component 170 can execute the transceiver 602 to receive a second reservation preamble 154 of the first operator 112 from the UE 110 on a first slot of an uplink channel in addition to receiving the first reservation preamble 152 of the first operator 112 to at least the UE 110 on the first slot of the downlink channel 135. For example, a sequence of the second reservation preamble 154 corresponds to at least one of a punctured or phase rotated waveform of the first reservation preamble 152.

[0050] In an aspect, the base station 105 can include a reservation preamble transmission component 170, which can be configured to transmit a reservation preamble for a particular operator based on an indication that the particular operator will transmit data on at least one transmission opportunity of the frame 133. That is, the reservation preamble transmission component 170 can notify or inform other network entities (e.g., the second base station 106) that support various operators that can potentially interfere with the transmission of the first base station 105 in the transmission opportunity. In some aspects, the first reservation preamble 152 and the second operator reservation preamble 154 can notify one or more network entities, including the base station 106 (e.g., a non-serving eNB), that the base station 105 will transmit data on the channel during a portion of the transmission opportunity for a given operator.

[0051] In particular, the reservation preamble transmission component 170 can be configured to control access to one or more transmission opportunities by operators by determining whether a highest priority operator has elected not to transmit a corresponding reservation preamble. For example, in some aspects, the first operator 112 can have a highest priority level such that access to at least one transmission opportunity can be made without contending with other operators. If the first operator 112 elects to transmit data on the at least one transmission opportunity, the reservation preamble transmission component 170 can be configured to notify or inform other network entities (e.g., the base station 106) that support different operators that the base station 105 plans or will transmit data for the first operator 112 at the at least one transmission opportunity (e.g., to avoid or mitigate interference to other network entities that are transmitting on the same frequency).

[0052] In the event that the first operator 112 forgoes the opportunity to transmit on at least one transmission opportunity of the frame 133, the reservation preamble transmission component 170 (and more specifically, the determination component 172) can be configured to determine whether the second operator 114 has elected to transmit data on the at least one transmission opportunity upon determining that the first operator reservation preamble 152 has not been transmitted by the first operator 112. As such, the reservation preamble transmission component 170 can be configured to transmit the second operator reservation preamble 154 to different network entities of at least the first operator 112, for example, based on a determination that the reservation preamble of the first operator 112 has not been transmitted to at least the second base station 106.

[0053] Further, in cases where the first base station 105 supports a third operator, the reservation preamble transmission component 170 can make a similar determination to determine whether the third operator can transmit an associated reservation preamble to gain access to the transmission opportunity. That is, in cases where both the first operator 112 and the second operator 114 have determined or elected not to utilize the transmission opportunity, and accordingly, in cases where the third operator does not detect transmission of the first operator reservation preamble 152 or the second operator reservation preamble 154, the third operator can or can not transmit an associated reservation preamble via the reservation preamble transmission component 170.

[0054] The wireless communication network 100 can include one or more base stations 105, one or more UEs 110, and a core network 115. The core network 115 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The base stations 105 can interface with the core network 115 through backhaul links 120 (e.g., SI, etc.). The base stations 105 can perform radio-configuration and

[0055] The base stations 105 / 106 can wirelessly communicate with the UEs 110 via one or more base station antennas. Each of the base station 105 / 106 can provide communication coverage for a respective geographic coverage area 130 of a network. In some examples, a base station 105 / 106 can be referred to as a base transceiver station, a radio base station, an access point, an access node, a radio transceiver, a NodeB, an eNodeB (eNB), a gNodeB (gNB), a Home NodeB, a Home eNodeB, a relay, or some other suitable terminology. The geographic coverage area 130 for a base station 105 / 106 can be divided into sectors or cells making up only a portion of the coverage area (not shown). The wireless communication network 100 can include base stations 105 / 106 of different types (e.g., macro base stations or small cell base stations, discussed below). Additionally, the base stations 105 / 106 can operate according to different

[0056] In some examples, the wireless communication network 100 can be or include one or any combination of the following communication technologies: a New Radio (NR) or 5G technology, a Long Term Evolution (LTE) or LTE-Advanced (LTE-A) or MuLTEfire technology, a Wi-Fi technology, a Bluetooth technology, or any other long or short range wireless communication technology. In LTE / LTE-A / MuLTEfire networks, the term eNode B (eNB) can be generally used to describe the base stations 105 / 106, while the term UE can be generally used to describe the UEs 110. The wireless communication network 100 can be a heterogeneous technology network that includes eNBs of different types, e.g., macro eNBs, small cell eNBs, or the like. The eNBs can provide communication coverage for one or more cells each being defined as a

[0057] A macro cell generally can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access by UEs 110 with service subscriptions with the network provider.

[0058] A small cell can include a relatively low-power base station, which can operate in the same or different frequency band (e.g., licensed, unlicensed, etc.) as macro cell. According to various examples, a small cell can include a pico, femto, or micro cell. A pico cell can cover a small geographic area and can allow unrestricted access by UEs 110 with service subscriptions with the network provider. A femto cell also can cover a small geographic area (e.g., a home) and can provide restricted access by UEs 110 associated with the femto cell, such as UEs 110 in a closed subscriber group (CSG) of the base station 105 (e.g., UEs 110 owned by the CSG, UEs 110 that have an association to the CSG (such as by subscription or other affiliation with the network provider) and / or the like) for restricted access, and / or unrestricted access. A micro cell can cover a geographic area that is larger than a pico cell and a femto cell, but smaller than a macro cell. An eNB for a macro cell can be referred to as a macro eNB. An eNB for a small cell can be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB can support one or multiple (e.g., two, three, four, etc.) cells (e.g., component carriers).

[0059] A communication network that can accommodate some of the various disclosed examples can be a packet-based network that operates according to a layered protocol stack, and data in the user plane can be based on the IP. A user plane protocol stack (e.g., packet data convergence protocol (PDCP), radio link control (RLC), MAC, etc.) can perform packet segmentation and reassembly to communicate over logical channels. For example, a MAC layer can perform priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer can provide establishment, configuration, and maintenance of an RRC connection between a UE 110 and a base station 105. The RRC protocol layer can also be used for core network 115 support of radio bearers for the user plane data. In the physical (PHY) layer, transport channels can be mapped to physical channels.

[0060] The UEs 110 can be dispersed throughout the wireless communication network 100, and each UE 110 can be stationary or mobile. A UE 110 can also include or be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. A UE 110 can be a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a smart watch, a wireless local loop (WLL) station, an entertainment device, a vehicle component, customer premises equipment (CPE), or any device that can communicate in a wireless communication network 100, or the like. In addition, a UE 110 can be an internet of things (IoT) and / or a machine-to-machine (M2M) type of device, e.g., a low power, low data rate type of device that can communicate infrequently, in some aspects, with the wireless communication network 100 or other UEs. A UE 110 can be capable of communicating with various types of base stations 105 and network equipment including macro e Bs, small cell e Bs, macro g Bs, small cell g Bs, relay base stations, and the like.

[0061] The UEs 110 can be configured to establish one or more wireless communication links 135 with one or more base stations 105. The wireless communication links 135 shown in wireless communication network 100 for channel reservation can carry uplink (UL) transmissions from a UE 110 to a base station 105, or downlink (DL) transmissions, from a base station 105 to a UE 110. The downlink transmissions can also be called forward link transmissions while the uplink transmissions can also be called reverse link transmissions. Each wireless communication link 135 can include one or more carriers, where each carrier can be a signal made up of multiple sub-carriers (e.g., waveform signals of different frequencies) modulated according to the various radio technologies described above. Each modulated signal can be sent in the carrier associated with a particular frequency or set of frequencies. The control information can also be carried on a physical downlink control channel (PDCCH) or other similar channel. In one aspect, the wireless communication links 135 can transmit bidirectional communications using frequency division duplex (FDD) (e.g., using paired spectrum resources) or time division duplex (TDD) operation (e.g., using unpaired spectrum resources). Frame structures can be defined for FDD (e.g., frame structure type 1) and TDD (e.g., frame structure type 2). Additionally, in some aspects, the wireless communication links 135 can represent one or more broadcast channels.

[0062] Similarly, in an aspect, the UE 110 can be configured to establish one or more wireless communication links 136 with one or more base stations 106. The wireless communication links 136 shown in wireless communication network 100 for channel reservation can carry UL transmissions from a UE 110 to a base station 106, or DL transmissions, from a base station 106 to a UE 110. For example, these UL transmissions can correspond to a communication link from a UE 110 served by a first network entity (e.g., base station 105) to a potential aggressor in a second network entity (e.g., base station 106).

[0063] In some aspects of the wireless communication network 100, base stations 105 / 106 or UEs 110 can include multiple antennas for employing antenna diversity schemes to improve communication quality and reliability between base stations 105 and UEs 110. Additionally or alternatively, base stations 105 / 106 and / or UEs 110 can employ multiple-input multiple-output (MIMO) techniques that can take advantage of multi-path environments to transmit different spatial layers carrying the same or different coded data.

[0064] Wireless communications system 100 can support operation on multiple cells or carriers, a feature which can be referred to as carrier aggregation (CA) or multi-carrier operation. A carrier can also be referred to as a component carrier (CC), a layer, a channel, etc. The terms “carrier,” “component carrier,” “cell,” and “channel” can be used interchangeably herein. A UE 110 can be configured with multiple downlink CCs for carrier aggregation and one or more uplink CCs. Carrier aggregation can be used with both FDD and TDD component carriers. For each carrier allocated in carrier aggregation for transmission in each direction, a base station 105 and UE 110 can use spectrum up to Y MHz (e.g., Y = 5, 10, 15, or 20 MHz) bandwidth. The carriers can or can not be adjacent to each other. The allocation of the carriers can be asymmetric with respect to DL and UL (e.g., more or less carriers can be allocated for DL than for UL). The component carriers can include a primary component carrier and one or more secondary component carriers. A primary component carrier can be referred to as a primary cell (PCell) and a secondary component carrier can be referred to as a secondary cell (SCell).

[0065] Wireless communications network 100 can further include a base station 105 / 106 operating according to Wi-Fi technology (e.g., a Wi-Fi access point) in communication with UEs 110 operating according to Wi-Fi technology (e.g., Wi-Fi stations (STAs)) via communication links in an unlicensed frequency spectrum (e.g., 5 GHz). When communicating in an unlicensed frequency spectrum, STAs and AP can perform a clear channel assessment (CCA) or listen before talk (LBT) procedure prior to communicating in order to determine whether the channel is available.

[0066] Additionally, one or more of base stations 105 and / or UEs 110 can operate according to NR or 5G technology, which can also be referred to as millimeter wave (mmW) technology. For example, mmW technology includes transmissions in mmW frequencies and / or near mmW frequencies. Extremely high frequency (EHF) is part of the radio frequency (RF) in the electromagnetic spectrum. EHF has a range from 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band can be referred to as a millimeter wave. Near mmW can extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends from 3 GHz to 30 GHz, and can also be referred to as centimeter wave. Communications using the mmW and / or near mmW radio frequency band has extremely high path loss and a short range. As such, base stations 105 and / or UEs 110 operating according to mmW technology can utilize beamforming for their transmissions. For example, a base station 105 can use beamforming techniques to transmit to a UE 110 in a particular direction, and the UE 110 can use beamforming techniques to transmit to the base station 105 in a particular direction.

[0067] Figure 2is a flowchart illustrating an example of a method 200 related to detection of at least one reservation preamble in accordance with various aspects of the present disclosure. Although the operations of the following described method are presented in a particular order and / or chronologically, it should be understood that the ordering of the actions and / or the components performing the actions can be different, unless specifically stated otherwise. Moreover, although the preamble relay component 150 is illustrated as having several subcomponents, it should be understood that one or more of the illustrated subcomponents can be combined with the preamble relay component 150 and / or with each other and / or divided into further subcomponents. Further, it should be understood that any of the actions or components described herein with respect to the preamble relay component 150 and / or its subcomponents can be executed by a specially-programmed processor, a processor executing specially-programmed software or computer-readable media, or by any other combination of hardware components and / or software components specifically configured to perform the described actions or components. Dashed lines surrounding one or more blocks can indicate optional steps.

[0068] In an aspect, at block 202, the method 200 can determine whether a first reservation preamble of a first operator is received from a first network entity on a first time slot of a plurality of time slots of a downlink channel. In an aspect, for example, the UE 110 and / or the preamble relay component 150 can execute the determination component 156 to determine whether the first reservation preamble 152 of the first operator 112 is received from the first base station 105 on the first time slot of the plurality of time slots of the downlink channel 135.

[0069] In some aspects, the determination component 156 can determine whether the first reservation preamble 152 of the first operator 112 is received by partitioning a receiver time frame into a plurality of segments each having a maximum time duration, accumulating one or more segments of the plurality of segments that correspond to a portion of the first reservation preamble 152, applying a non-coherent cross-correlation operation to each of the accumulated one or more segments, and combining each output of the non-coherent cross-correlation operation to trigger detection of the first reservation preamble 152.

[0070] In some aspects, the non-coherent cross-correlation operation corresponds to at least one of a time-domain non-coherent cross-correlation operation or a frequency-domain non-coherent cross-correlation operation.

[0071] At block 204, the method 200 can transmit a second reservation preamble of the first operator to a second network entity on an uplink channel based on determining that the first reservation preamble of the first operator is received. In an aspect, for example, the UE 110 and / or the preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 of the first operator 112 to the second base station 106 on an uplink channel based on determining that the first reservation preamble 152 of the first operator 112 is received.

[0072] In some aspects, the UE 110 and / or the preamble relay component 150 can execute the transceiver 60 Figure 1 ) to transmit the second reservation preamble 154 at a transmission time corresponding to a completion time of determining reception of the first reservation preamble 152 of the first operator 112.

[0073] In some aspects, an ending time of the second reservation preamble 154 corresponds to an ending time of the first reservation preamble 152, the ending time of the second reservation preamble 154 and the ending time of the first reservation preamble 152 align with a slot boundary of the first slot.

[0074] In some aspects, although not shown, the method 300 can include determining a ratio of a time duration of the second reservation preamble 154 to a time duration of the switching gap, where the second reservation preamble 154 aligns with a slot boundary of the first slot.

[0075] In some aspects, a sequence of the second reservation preamble 154 corresponds to at least one of a punctured or a phase-rotated waveform of the first reservation preamble 152.

[0076] In some aspects, the UE 110 and / or the preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 as a single frequency network (SFN) transmission based on both the UE 110 and the first base station 105 corresponding to the first operator 112.

[0077] In some aspects, the UE 110 includes a plurality of transmit antennas 656. Further, the UE 110 and / or the preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 over the plurality of transmit antennas 565 by reusing an OFDM frame.

[0078] In some aspects, the UE 110 and / or the preamble relay component 150 can execute the transceiver 502 to transmit the second reservation preamble 154 based on a configurable transmit diversity scheme.

[0079] In some aspects, the configurable transmit diversity scheme includes at least one of a tone interlacing in a frequency domain, a sub-band interlacing in the frequency domain, or a cyclic shift diversity in a time domain.

[0080] In some aspects, although not shown, the method 200 can include receiving, from the first base station 105, an indication of a number of operators, and determining a transmission opportunity structure including the first slot based on the number of operators from the first base station 105, where the number of operators includes a second base station 106 having a lower priority level than the first base station 105.

[0081] Figure 3is a flowchart illustrating an example of a method 300 related to transmission of at least one reservation preamble in accordance with various aspects of the present disclosure. Although the operations of method 300 are presented in a particular order and / or chronologically, it should be understood that this order or sequence is not an absolute requirement. For example, some of the operations could be performed in an order different than presented or not performed at all. Further, some of the operations could be performed concurrently, not chronologically. Also, although reservation preamble transmission component 170 is illustrated as having several subcomponents, it should be understood that one or more of the subcomponents could be separate from reservation preamble transmission component 170 and / or each other. Further, it should be understood that any of the actions or components described herein with respect to reservation preamble transmission component 170 and / or its subcomponents could be executed by a specially-programmed processor, a processor executing specially-programmed software or computer-readable media, or by any other combination of hardware and / or software components specially-configured to perform the described actions or components. The dashed line surrounding one or more of the blocks can represent optional steps.

[0082] In an aspect, at block 302, method 300 can generate a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a CAZAC sequence. In an aspect, for example, base station 105 and / or reservation preamble transmission component 170 can perform determination component 172 to generate a first reservation preamble 152 of first operator 112 based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a CAZAC sequence.

[0083] At block 304, method 300 can transmit the first reservation preamble of the first operator to at least the UE on a first time slot of a plurality of time slots of a downlink channel. In an aspect, for example, base station 105 and / or reservation preamble transmission component 170 can perform transceiver 602 to transmit the first reservation preamble 152 of the first operator to at least UE 110 on a first time slot of a plurality of time slots of downlink channel 135.

[0084] In some aspects, base station 105 and / or reservation preamble transmission component 170 can perform transceiver 602 to transmit a plurality of uniformly spaced pilot tones corresponding to the first reservation preamble 152.

[0085] In some aspects, the first network entity includes a plurality of transmit antennas 665. Further, base station 105 and / or reservation preamble transmission component 170 can perform transceiver 602 to transmit the first reservation preamble 152 on the plurality of transmit antennas 665 by reusing an OFDM frame.

[0086] In some aspects, the network entity includes a plurality of transmit antennas. Further, base station 105 and / or reservation preamble transmission component 170 can perform transceiver 602 to transmit the first reservation preamble 152 based on a configurable transmit diversity scheme.

[0087] In some aspects, the configurable transmit diversity scheme includes at least one of tone interlacing in the frequency domain, sub-band interlacing in the frequency domain, or cyclic shift diversity in the time domain.

[0088] In some aspects, although not shown, the method 300 can include transmitting, from the UE 110, a second reservation preamble 154 of the first operator 112 on the first time slot of the uplink channel in response to receiving the first reservation preamble 152 of the first operator 112 on the first time slot of the downlink channel 135.

[0089] In some aspects, a sequence of the second reservation preamble 154 corresponds to a sequence of the first reservation preamble 152.

[0090] In some aspects, the base station 105 and / or the reservation preamble transmission component 170 can execute the transceiver 602 to transmit the first reservation preamble 152 as a single frequency transmission based on both the UE 110 and the first base station 105 corresponding to the first operator 112.

[0091] In some aspects, the base station 105 and / or the reservation preamble transmission component 170 can execute the transceiver 602 to transmit, on the downlink channel 135, data associated with the first operator 112 within the portion of the transmission opportunity in response to transmitting the first reservation preamble 152 of the first operator 112.

[0092] In some aspects, the first reservation preamble 152 of the first operator 112 notifies at least one of the first base station 105 and the second base station 106 that the first base station 105 will have access to the channel 135 during the portion of the transmission opportunity.

[0093] In some aspects, although not shown, the method 300 can include restricting access to the portion of the transmission opportunity by one or more network entities, including at least one of the second base station 106, based on determining that the first reservation preamble 152 of the first operator 112 has been transmitted by at least the first base station 105.

[0094] Figure 4is a conceptual diagram of a transmission opportunity 400 including a reservation preamble structure during downlink communications from a network entity, such as a base station 105, to a UE, such as a UE 110, in accordance with one or more aspects. For example, the transmission opportunity 400 including the reservation preamble structure can be a portion of a frame 133 in a communication system that supports at least three operators (e.g., OP1, OP2, and OP3). In some aspects, the transmission opportunity 400 can include one or more LBT slots that allow or facilitate transmitting a reservation preamble assigned to a particular operator of the LBT slot based on a priority level. For example, a first operator 112 can have the highest priority and, as such, can determine or select to transmit data on the transmission opportunity 400 without contending with the other operators. If the first operator 112 chooses not to transmit the assigned or allocated reservation preamble to the other network entities, a second operator 114 can transmit on the transmission opportunity. Likewise, a third operator can utilize the transmission opportunity 400 to transmit and transmit the assigned or allocated reservation preamble when the first operator 112 and the second operator 114 forego transmitting their respective reservation preambles.

[0095] Figure 5 is a conceptual diagram of a transmission opportunity 500 including a reservation preamble structure during downlink communications from a network entity, such as a base station 105, to a UE, such as a UE 110, in accordance with one or more aspects. For example, the transmission opportunity 400 including the reservation preamble structure can be a portion of a frame 133 in a communication system that supports at least two operators (e.g., OP1 and OP2). In some aspects, the transmission opportunity 500 can include one or more LBT slots that allow or facilitate transmitting a reservation preamble assigned to a particular operator of the LBT slot based on a priority level. For example, the transmission opportunity 500 follows a frequency division duplexing permit downlink and uplink reservation preamble relay scheme. Specifically, a node, such as a UE, can detect a reservation preamble in LBT slot 2. The node can transmit a corresponding reservation preamble on the uplink prior to the end of LBT slot 2 through an early detection (e.g., low latency) process of the reservation preamble. As such, OP1 can reserve the channel for uplink and downlink communications.

[0096] Figure 6 is a conceptual diagram of an example of a reservation preamble 600 with a configurable switching gap in accordance with one or more aspects. For example, a reservation preamble transmission of a first operator 112 can be a portion of a frame 133 in a communication system that supports at least three operators. The reservation preamble 600 can include a system bandwidth of at least one of 20, 40, or 80 MHz. Further, a time duration of the reservation preamble 600 can be a sum of T U and T G , where TU Waveform samples corresponding to multi-tone transmission, and T G corresponding to switching gap in case of no active transmission. In some instances, for the same operator, downlink and uplink reservation preambles use the same sequence to achieve a single frequency network effect, which will enhance the reliability of channel reservation at the operator level. Additionally, the ratio of switching gap to multi-tone transmission (e.g., N0 / N1) can be adapted to different coverage requirements of downlink and uplink channel reservation.

[0097] Figure 7 is a conceptual diagram of an example of a scenario 700 of frequency mapping of reservation preamble tones according to one or more aspects. For example, a network entity, such as a base station 105, can generate a reservation preamble that is implemented by using less than N1samples sampled at a sampling rate F s to achieve early detection (e.g., low latency), where L tones of the reservation preamble need to be allocated to L frequency bins of a reduced size Fast Fourier Transform (FFT) of size 2 M-Q As a result, once the reservation preamble is transmitted on the downlink, a node such as a UE 110 can perform early detection of the reservation preamble based on frequency mapping of preamble tones.

[0098] Figure 8 is a conceptual diagram of an example of a transmission scheme scenario 800 for a reservation preamble according to one or more aspects. For example, a reservation preamble transmission of a first operator 112 can be part of a frame 133 in a communication system that supports tone interlacing. In some aspects, the reservation preamble 802 can be transmitted using multiple antennas. For example, the reservation preamble 802 can be generated by using a base sequence and zero padding with an inverse FFT (IFFT) of size N. After generation, the reservation preamble 802 can be transmitted by transmit antenna 0. Additionally, a modified reservation preamble 804 can be transmitted by transmit antenna 1 with a frequency shift of size U, and a modified reservation preamble 806 can be transmitted by transmit antenna 2 with a frequency shift of 2U.

[0099] Figure 9 is a conceptual diagram of an example of a transmission scheme scenario 900 for a reservation preamble according to one or more aspects. For example, a reservation preamble transmission of a first operator 112 can be part of a frame 133 in a communication system that supports subband interlacing. Similar to Figure 8The reserved preamble 902 can be transmitted using multiple antennas. For example, the reserved preamble 902 can be generated using a base sequence and zero-padding with an IFFT of size N. After generation, the reserved preamble 902 can be transmitted by transmit antenna 0. Additionally, a modified reserved preamble 904 can be transmitted by transmit antenna 1 with a frequency shift of size L, and a modified reserved preamble 906 can be transmitted by transmit antenna 2 with a frequency shift of 2L.

[0100] Figure 10 This is a conceptual diagram illustrating an example of a transmission scheme scenario 1000 for pre-code retention, based on one or more aspects. For example, the pre-code retention transmission of a first operator 112 could be part of frame 133 in a communication system supporting cyclic shift diversity. Similar to... Figure 8 The reserved preamble 1002 can be transmitted using multiple antennas. For example, the reserved preamble 1002 can be generated using a base sequence and zero-padding with an IFFT of size N. After generation, the reserved preamble 1002 can be transmitted by transmit antenna 0. Additionally, a modified reserved preamble 1004 can be transmitted by transmit antenna 1 with cyclic shifting (e.g., frequency-by-frequency phase ramping), and a modified reserved preamble 1006 can be transmitted by transmit antenna 2 with cyclic shifting.

[0101] Reference Figure 11 An example implementation of UE 110 may include various components, some of which have already been described above, but also include components such as one or more processors 1112 and memory 1116 communicating via one or more buses 1144, and transceiver 1102, which may operate in conjunction with modem 140 and preamble relay component 150 to implement one or more functions described herein related to performing measurements during a connected mode in a wireless communication system. Furthermore, one or more processors 1112, modem 1114, memory 1116, transceiver 1102, radio frequency (RF) front end 1188, and one or more antennas 1165 may be configured to support voice and / or data calls (simultaneously or not simultaneously) in one or more radio access technologies. In some aspects, modem 140 may be associated with modem 140 (… Figure 1 (Same or similar)

[0102] In an aspect, the one or more processors 1112 can include a modem 140 that uses one or more modem processors. The various functions related to preamble relay component 150 can be included in modem 140 and / or processors 1112, and in an aspect, can be executed by a single processor, while in other aspects, different ones of the functions can be executed by a combination of two or more different processors. For example, in an aspect, the one or more processors 1112 can include any one or any combination of a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiver processor, or a transceiver processor associated with transceiver 1102. In other aspects, some of the features of the one or more processors 1112 and / or modem 140 associated with preamble relay component 150 can be performed by transceiver 1102.

[0103] Additionally, the memory 1116 can be configured to store data used by the present disclosure and / or to store local versions of applications 1175, or one or more of the preamble relay component 150 and / or its subcomponents, executed by the at least one processor 1112. The memory 1116 can include any type of computer-readable medium usable by a computer or the at least one processor 1112, such as random access memory (RAM), read only memory (ROM), tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof. In an aspect, for example, the memory 1116 can be a non-transitory computer-readable storage medium that stores one or more computer-executable codes defining the preamble relay component 150 and / or its subcomponents, and / or data associated therewith, when the UE 110 is operating at least one processor 1112 to execute one or more of the preamble relay component 150 and / or its subcomponents.

[0104] The transceiver 1102 can include at least one receiver 1106 and at least one transmitter 1108. The receiver 1106 can include hardware, firmware, and / or software code executable by a processor for receiving data, the code including instructions for receiving data and being stored in a memory (e.g., computer-readable medium). The receiver 1106 may, for example, be an RF receiver. In an aspect, the receiver 1106 can receive signals transmitted by at least one base station 105. Additionally, the receiver 1106 can process such received signals, and also can obtain measurements of the signals, such as, but not limited to, Ec / Io, SNR, RSRP, RSSI, etc. The transmitter 1108 can include hardware, firmware, and / or software code executable by a processor for transmitting data, the code including instructions for transmitting data and being stored in a memory (e.g., computer-readable medium). A suitable example of the transmitter 1108 can including, but not be limited to, an RF transmitter.

[0105] Moreover, in an aspect, UE 110 can include RF front end 1188, which can operate in communication with one or more antennas 1165 and transceiver 1102 for receiving and transmitting radio transmissions, such as wireless communications transmitted by at least one base station 105, wireless transmissions received from neighboring UEs 206 and / or 208, or wireless transmissions transmitted by UE 110. RF front end 1188 can be connected to one or more antennas 1165 and can include one or more low-noise amplifiers (LNAs) 1190, one or more switches 1192, one or more power amplifiers (PAs) 1198, and one or more filters 1196 for transmitting and receiving RF signals.

[0106] In an aspect, LNA 1190 can amplify a received signal at a desired output level. In an aspect, each LNA 1190 can have a specified minimum and maximum gain values. In an aspect, RF front end 1188 can use one or more switches 1192 to select a particular LNA 1190 and its specified gain value based on a desired gain value for a particular application.

[0107] Moreover, for example, one or more PA 1198 can be used by RF front end 1188 to amplify a signal for a desired output power level of an RF output. In an aspect, each PA 1198 can have a specified minimum and maximum gain values. In an aspect, RF front end 1188 can use one or more switches 1192 to select a particular PA 1198 and a corresponding specified gain value based on a desired gain value for a particular application.

[0108] Furthermore, for example, one or more filters 1196 can be used by RF front end 1188 to filter a received signal to obtain an input RF signal. Similarly, in an aspect, for example, a respective filter 1196 can be used to filter an output from a respective PA 1198 to produce an output signal for transmission. In an aspect, each filter 1196 can be connected to a particular LNA 1190 and / or PA 1198. In an aspect, RF front end 1188 can use one or more switches 1192 to select a transmit or receive path using a specified filter 1196, LNA 1190, and / or PA 1198 based on a configuration as specified by transceiver 1102 and / or processor 1112.

[0109] As such, the transceiver 1102 can be configured to transmit and receive wireless signals through one or more antennas 1165 via the RF front end 1188. In an aspect, the transceiver 1102 can be tuned to operate at specified frequencies, such that the UE 110 may, for example, communicate with one or more base stations 105 or one or more cells associated with one or more base stations 105. In an aspect, for example, the modem 140 can configure the transceiver 1102 to operate at a specified frequency and power level based on the UE configuration of the UE 110 and the communication protocol used by the modem 140.

[0110] In an aspect, the modem 140 can be a multi-band-multi-mode modem that can process digital data and communicate with the transceiver 1102 such that the transceiver 1102 is used to transmit and receive the digital data. In an aspect, the modem 140 can be multi-band and configured to support multiple frequency bands for a particular communication protocol. In an aspect, the modem 140 can be multi-mode and configured to support multiple operating networks and communication protocols. In an aspect, the modem 140 can control one or more components of the UE 110 (e.g., the RF front end 1188, the transceiver 1102) to enable transmission and / or reception of signals from a network based on a specified modem configuration. In an aspect, the modem configuration can be based on the mode of the modem and the frequency band used. In another aspect, the modem configuration can be based on UE configuration information associated with the UE 110, as provided by the network during cell selection and / or cell reselection.

[0111] Referring to Figure 12 One example of an implementation of the base station 105 can include a variety of components, some of which have already been described above, but including components such as one or more processors 1212, memory 1216, and transceiver 1202 in communication via one or more buses 1244, which can operate in conjunction with the modem 160 and reserved preamble transmission component 170.

[0112] The transceiver 1202, receiver 1206, transmitter 1208, one or more processors 1212, memory 1216, applications 1275, buses 1244, RF front end 1288, LNAs 1290, switches 1292, filters 1296, PAs 1298, and one or more antennas 1265 can be the same as or similar to the corresponding components of UE 110, as described above, but configured or otherwise programmed for base station operations rather than UE operations.

[0113] The detailed description set forth above describes examples in connection with the appended drawings, but is not intended to represent the only examples that can be implemented or that fall within the scope of the claims. The term "example" is used herein to mean "serving as an example, instance, or illustration," and not to imply "preferred" or "superior" over other examples. The detailed description includes specific details for the purpose of providing a thorough understanding of the described techniques. These techniques, however, can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0114] Information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, computer-executable code or instructions stored on a computer-readable medium, or any combination thereof.

[0115] The various illustrative blocks and components described in connection with the disclosure herein can be implemented or performed with a specially-programmed apparatus such as, but not limited to, a processor, a digital signal processor (DSP), an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A specially-programmed processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, microcontroller, or state machine. A specially-programmed processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0116] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted over as one or more instructions or code on a non-transitory computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a specially programmed processor, hardware, firmware, hardwiring, or combinations thereof. Features implementing functions can also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Also, as used herein, including in the claims, "or" as used in a list of items prefaced by "at least one of indicates a disjunctive sense such that, for example, a list including "at least one of A, B, or C" means A or B or C or any combination thereof (i.e., A and B or A and C or B and C or A and B and C).

[0117] Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media can be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0118] The previous description of the disclosure is provided to enable any persons skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other variations without departing from the spirit or scope of the disclosure. Furthermore, although elements of the described aspects and / or embodiments can be described or claimed in singular form, plural forms can be used accordingly unless explicitly disclaimed. In addition, all or portions of any aspect and / or embodiment can be used with all or portions of any other aspect and / or embodiment unless otherwise stated. Thus, the disclosure is not to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of communicating at a first network entity, comprising: generating a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a constant amplitude zero auto correlation (CAZAC) sequence, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and transmitting the first reservation preamble of the first operator to at least a user equipment (UE) on a first of a plurality of slots of a downlink channel.

2. The method of claim 1, wherein transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel further comprises transmitting a plurality of uniformly spaced pilot tones corresponding to the first reservation preamble.

3. The method of claim 1, wherein the first network entity comprises a plurality of transmit antennas, and wherein transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel further comprises transmitting the first reservation preamble on the plurality of transmit antennas by reusing an orthogonal frequency division multiplexing (OFDM) frame.

4. The method of claim 1, wherein transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel further comprises transmitting the first reservation preamble based on a configurable transmit diversity scheme.

5. The method of claim 4, wherein the configurable transmit diversity scheme comprises at least one of tone interleaving in a frequency domain, subband interleaving in the frequency domain, or cyclic shift diversity in a time domain. receiving a second reservation preamble of the first operator from the UE on a first of an uplink channel in response to transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel.

6. The method of claim 1, further comprising:

7. The method of claim 6, wherein a sequence of the second reservation preamble corresponds to at least one of punctured or phase rotated waveforms of the first reservation preamble.

8. The method of claim 1, wherein transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel further comprises transmitting the first reservation preamble as a single frequency network (SFN) transmission based on both the UE and the first network entity corresponding to the first operator.

9. The method of claim 1, further comprising transmitting data associated with the first operator on the downlink channel within a portion of a transmission opportunity in response to transmitting the first reservation preamble of the first operator. ​ 10. The method of claim 9, wherein the first reservation preamble of the first operator informs one or more UEs of at least one of the first network entity and a second network entity that the first network entity will access a channel during the portion of the transmission opportunity.

11. The method of claim 9, further comprising restricting access to the portion of the transmission opportunity by one or more network entities based on a determination that the first reservation preamble of the first operator has been transmitted by at least the first network entity.

12. An apparatus for wireless communication, comprising: a memory; and a processor coupled to the memory and configured to: generate a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a constant amplitude zero auto correlation (CAZAC) sequence, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and transmit the first reservation preamble of the first operator to at least a user equipment (UE) on a first of a plurality of slots of a downlink channel.

13. The apparatus of claim 12, wherein the processor configured to transmit the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel is further configured to transmit a plurality of uniformly spaced pilot tones corresponding to the first reservation preamble.

14. The apparatus of claim 12, wherein the apparatus comprises a plurality of transmit antennas, and wherein transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel further comprises transmitting the first reservation preamble on the plurality of transmit antennas by reusing an orthogonal frequency division multiplexing (OFDM) frame.

15. The apparatus of claim 12, wherein the processor configured to transmit the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel is further configured to transmit the first reservation preamble based on a configurable transmit diversity scheme.

16. The apparatus of claim 15, wherein the configurable transmit diversity scheme comprises at least one of tone interleaving in a frequency domain, subband interleaving in the frequency domain, or cyclic shift diversity in a time domain.

17. The apparatus of claim 12, wherein the processor is further configured to receive a second reservation preamble of the first operator from the UE on a first of a plurality of slots of an uplink channel in response to transmitting the first reservation preamble of the first operator to at least a UE on a first of a plurality of slots of a downlink channel.

18. The apparatus of claim 17, wherein a sequence of the second reservation preamble corresponds to at least one of punctured or phase rotated waveforms of the first reservation preamble.

19. The apparatus of claim 12, wherein the processor configured to transmit the first reservation preamble of the first operator to at least a UE on a first time slot of a plurality of time slots of a downlink channel is further configured to transmit the first reservation preamble as a single frequency network (SFN) transmission based on both the UE and the apparatus corresponding to the first operator.

20. The apparatus of claim 12, wherein the processor is further configured to transmit data associated with the first operator on the downlink channel within a portion of a transmission opportunity in response to transmitting the first reservation preamble of the first operator.

21. The apparatus of claim 20, wherein the first reservation preamble of the first operator informs at least one of the apparatus and a second network entity that the apparatus will access a channel during the portion of the transmission opportunity.

22. The apparatus of claim 20, wherein the processor is further configured to restrict access to the portion of the transmission opportunity by one or more network entities based on a determination that the first reservation preamble of the first operator has been transmitted by at least the apparatus.

23. An apparatus for wireless communication, comprising: means for generating a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a constant amplitude zero auto correlation waveform (CAZAC) sequence, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and means for transmitting the first reservation preamble of the first operator to at least a user equipment (UE) on a first time slot of a plurality of time slots of a downlink channel.

24. A non-transitory computer-readable medium having computer-executable code stored therein for wireless communication, comprising code to: generate a first reservation preamble of a first operator based on at least one of a compressed representation in a signal space, a basis function of the signal space, or a constant amplitude zero auto correlation waveform (CAZAC) sequence, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and transmit the first reservation preamble of the first operator to at least a user equipment (UE) on a first time slot of a plurality of time slots of a downlink channel.

25. A method of communicating at a user equipment (UE), comprising: determining whether a first reservation preamble of a first operator is received from a first network entity on a first time slot of a plurality of time slots of a downlink channel, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and transmitting a second reservation preamble of the first operator to a second network entity on an uplink channel based on a determination that the first reservation preamble of the first operator is received. ​ 26. An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and a processor coupled to the memory and configured to: determine whether a first reservation preamble of a first operator is received from a first network entity on a first slot of a plurality of slots of a downlink channel, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and transmit, based on a determination that the first reservation preamble of the first operator is received, a second reservation preamble of the first operator to a second network entity on an uplink channel.

27. An apparatus for wireless communication at a user equipment (UE), comprising: means for determining whether a first reservation preamble of a first operator is received from a first network entity on a first slot of a plurality of slots of a downlink channel, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and means for transmitting, based on a determination that the first reservation preamble of the first operator is received, a second reservation preamble of the first operator to a second network entity on an uplink channel.

28. A non-transitory computer-readable medium having stored thereon computer executable code for wireless communication at a user equipment (UE), comprising code to: determine whether a first reservation preamble of a first operator is received from a first network entity on a first slot of a plurality of slots of a downlink channel, wherein a time duration of the first reservation preamble comprises a plurality of waveform samples of a multi-tone transmission and a switching gap without one or more active transmissions; and transmit, based on a determination that the first reservation preamble of the first operator is received, a second reservation preamble of the first operator to a second network entity on an uplink channel.

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