System information for access and backhaul

Abstract

Methods, systems, and devices for wireless communications that provide system information (SI) for access and backhaul are described. An access node (AN) may provide SI indicating the configuration of a communication procedure to devices within its cell. The AN may provide SI that varies to devices depending on whether the communication procedure is an access procedure or a backhaul procedure. The AN may transmit a common master information block (MIB) that directs devices within its cell to a search space in order to receive the remaining SI. The search space may be shared between the access device and the backhaul device, or alternatively may be split between the access device and the backhaul device. The remaining SI may not be shared between the access device and the backhaul device. The devices may determine different configurations as defined by the SI from the AN for the communication procedures based on whether the procedure is an access procedure or a backhaul procedure.

Description

[0001] This application is a divisional application of Chinese invention patent application 201980030569.3 (PCT / US2019 / 023151), filed on March 20, 2019, and entitled “System Information for Access and Backhaul”. Technical Field

[0002] The following relates generally to wireless communications and, more particularly, to system information (SI) for access and backhaul. Background Art

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread OFDM (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be further referred to as user equipment (UE).

[0004] Some wireless communication systems (such as those operating in the millimeter wave (mmW) spectrum) may include an access node (AN) to facilitate wireless communication between UEs and the network. In some cases, the anchor AN may have a high-capacity, wired, backhaul connection (e.g., fiber) to the network while communicating with one or more ANs (e.g., relays) or UEs. In some examples, the anchor AN may be referred to as an integrated access backhaul (IAB) donor node. A network that supports communication between an AN and a UE may be referred to as an access network, while a network that supports communication between one or more ANs may be referred to as a backhaul network. In deployments that support both access and backhaul (e.g., in an IAB network), standard random access channel (RACH) configurations may be restrictive. For example, timing and power differences between access and backhaul RACHs may lead to increased multiplexing complexity at the AN. Summary of the Invention

[0005] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting system information (SI) for access and backhaul. Generally, the described techniques provide SI specific to access or backhaul procedures. In some cases, an access node (AN) may send random access channel (RACH) configuration information to devices within its cell. Separate SI for access and backhaul procedures may indicate different RACH configurations for the AN depending on whether the RACH procedure is associated with backhaul or access.

[0006] In some examples, the receiving AN may indicate SI to devices in the cell via a common master information block (MIB). The MIB may point devices to a search space, allowing them to receive additional SI. This search space may be the same search space for both access and backhaul, or alternatively, the common MIB may point devices to separate search spaces for access and backhaul procedures. The receiving AN may indicate the remaining SI to the device so that the remaining SI is specific to the backhaul or access procedure. Separate SI for backhaul and access procedures may enable the receiving AN to receive and / or transmit RACH preambles for both access and backhaul procedures.

[0007] A wireless communication method is described. The method may include: receiving, at a relay device in the wireless network, a backhaul SI configuration from a network node in the wireless network; determining, based on the backhaul SI configuration, a backhaul SI for communication with the network node or another network node of the wireless network, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by the relay device; and accessing the network node or the another network node based on the backhaul SI, the access SI, or both.

[0008] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: receive, at a relay device in a wireless network, a backhaul SI configuration from a network node in the wireless network; determine, based on the backhaul SI configuration, a backhaul SI for communication with the network node or another network node of the wireless network, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by the relay device; and access the network node or the other network node based on the backhaul SI, the access SI, or both.

[0009] Another apparatus for wireless communication is described. The apparatus may include means for: receiving, at a relay device in the wireless network, a backhaul SI configuration from a network node in the wireless network; determining, based on the backhaul SI configuration, a backhaul SI for communication with the network node or another network node of the wireless network, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by the relay device; and accessing the network node or the another network node based on the backhaul SI, the access SI, or both.

[0010] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: receive, at a relay device in a wireless network, a backhaul SI configuration from a network node in the wireless network; determine, based on the backhaul SI configuration, a backhaul SI for communication with the network node or another network node of the wireless network, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by the relay device; and access the network node or the other network node based on the backhaul SI, the access SI, or both.

[0011] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, determining the backhaul SI may include operations, features, apparatus, or instructions for: monitoring the backhaul search space and backhaul control resource set (CORESET) indicated by the backhaul SI configuration to search for a backhaul-specific SI radio network temporary identifier (SI-RNTI).

[0012] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the backhaul SI configuration indicates one or both of a search space and a CORESET for SI grant.

[0013] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a PDCCH conveying an SI grant based on a backhaul SI configuration, wherein the SI grant schedules an SI message via a PDSCH.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a synchronization signal (SS) indicating access SI at a relay device.

[0015] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: receiving an access SI configuration indicating an access search space and an access CORESET at a relay device, and monitoring the access search space and the access CORESET for an access-specific SI-RNTI.

[0016] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the access-specific SI-RNTI and the backhaul-specific SI-RNTI may be different.

[0017] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, at least a portion of the backhaul search space may be the same as at least a portion of the access search space.

[0018] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, at least a portion of a backhaul CORESET may be the same as at least a portion of an access CORESET.

[0019] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, an access SI configuration indicates one or both of a search space and a CORESET for SI grant.

[0020] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a PDCCH conveying an SI grant based on an access SI configuration, wherein the SI grant schedules an SI message via a PDSCH.

[0021] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, receiving a PDCCH may include operations, features, means, or instructions for descrambling one or more CRC bits using an access SI-RNTI.

[0022] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting a first random access message to the network node or another network node based on the backhaul SI.

[0023] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for determining that the random access procedure is unsuccessful based on transmitting a first random access message, and transmitting a second random access message to the network node or another network node based on the access SI.

[0024] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: receiving an access SI configuration at a relay device from a network node in a wireless network, determining an access SI for one or more wireless devices to access a cellular cell supported by the relay device based on the access SI configuration, and transmitting an SS indicating the access SI to one or more devices in the wireless network.

[0025] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the backhaul SI includes a backhaul-specific SI-RNTI, an access-specific SI-RNTI for the access SI, or a combination thereof.

[0026] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the backhaul SI includes a different CORESET or search space than the access SI.

[0027] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: receiving a broadcast channel including a common MIB from a network node, determining a backhaul CORESET or backhaul search space based on the common MIB for communication with the network node, and monitoring the backhaul CORESET or backhaul search space for a backhaul-specific SI-RNTI.

[0028] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: determining an access CORESET or an access search space based on a common MIB, wherein the access CORESET may be different from the backhaul CORESET or the access search space may be different from the backhaul search space, and transmitting an SS indicating an access SI to one or more devices in a wireless network based on the access CORESET or the access search space.

[0029] Some examples of the methods, apparatus (equipment) and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining a backhaul CORESET or backhaul search space based on a backhaul-specific relationship table that maps a common MIB to a backhaul CORESET or backhaul search space, and determining an access CORESET or access search space based on an access-specific relationship table that maps a common MIB to an access CORESET or access search space.

[0030] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for determining an access CORESET or access search space based on a common MIB, wherein the access CORESET may be different from the backhaul CORESET or the access search space may be different from the backhaul search space, and receiving an SS indicating an access SI to one or more devices in a wireless network based on the access CORESET or the access search space.

[0031] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for receiving access residual minimum SI (RMSI) using a first transmission beam set and receiving backhaul RMSI using a second transmission beam set, wherein at least one transmission beam in the second transmission beam set may be in a different direction from at least one transmission beam in the first transmission beam set.

[0032] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for transmitting access RMSI using a first transmission beam set and transmitting backhaul RMSI using a second transmission beam set, wherein at least one transmission beam in the second transmission beam set may be in a different direction from at least one transmission beam in the first transmission beam set.

[0033] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for monitoring a search space indicated by the access SI for an access-specific Radio Network Temporary Identifier (RNTI).

[0034] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for scrambling DCI based on the access-specific RNTI and transmitting the scrambled DCI to one or more devices in the wireless network.

[0035] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for generating a demodulation reference signal (DMRS) based on an access-specific RNTI and transmitting the DMRS to one or more devices in a wireless network.

[0036] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the DMRS may be associated with the PDCCH or the PDSCH.

[0037] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for generating a PDSCH based on the access-specific RNTI and transmitting the PDSCH to one or more devices in a wireless network.

[0038] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving DCI from a network node and descrambling the DCI based on the access-specific RNTI.

[0039] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a DMRS from a network node based on the access-specific RNTI.

[0040] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the DMRS may be associated with the PDCCH or the PDSCH.

[0041] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a PDSCH from a network node based on the access-specific RNTI.

[0042] In some examples of the methods, apparatuses (equipment), and non-transitory computer-readable media described herein, the content of the RMSI of one or more reference signals (RSs) may be backhaul specific, wherein the one or more RSs include SS blocks or CSI RSs.

[0043] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, RSs may be associated with different transmission beam directions.

[0044] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, the content of the backhaul-specific RMSI for a first RS may be different from the content of the backhaul-specific RMSI for a second RS, which may be different from the first RS.

[0045] A wireless communication method is described. The method may include: receiving, at a relay device in the wireless network, an access SI configuration and a backhaul SI configuration from a network node in the wireless network; determining, based on the access SI configuration, an access SI for one or more devices to access a cell supported by the relay device, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node of the wireless network; and transmitting a SS indicating the access SI to the one or more devices in the wireless network.

[0046] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: receive, at a relay device in a wireless network, an access SI configuration and a backhaul SI configuration from a network node in the wireless network; determine, based on the access SI configuration, an access SI for one or more devices to access a cell supported by the relay device, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node of the wireless network; and transmit a SS indicating the access SI to the one or more devices in the wireless network.

[0047] Another apparatus for wireless communication is described. The apparatus may include means for: receiving, at a relay device in a wireless network, an access SI configuration and a backhaul SI configuration from a network node in the wireless network; determining, based on the access SI configuration, an access SI for one or more devices to access a cell supported by the relay device, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node of the wireless network; and transmitting an SS indicating the access SI to the one or more devices in the wireless network.

[0048] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: receive, at a relay device in a wireless network, an access SI configuration and a backhaul SI configuration from a network node in the wireless network; determine, based on the access SI configuration, an access SI for one or more devices to access a cell supported by the relay device, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node of the wireless network; and transmit a SS indicating the access SI to the one or more devices in the wireless network.

[0049] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an access SI configuration indicating an access search space and an access CORESET to one or more devices.

[0050] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving a PDCCH conveying an SI grant based on an access SI configuration, wherein the SI grant schedules an SI message via a PDSCH.

[0051] In some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein, transmitting a PDCCH may include operations, features, means, or instructions for scrambling one or more CRC bits using an access SI-RNTI.

[0052] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for scrambling DCI based on an access-specific RNTI and transmitting the scrambled DCI to one or more devices in a wireless network.

[0053] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for generating a DMRS based on the access-specific RNTI and transmitting the DMRS to one or more devices in the wireless network.

[0054] Some examples of the methods, apparatus (equipment), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for generating a PDSCH based on the access-specific RNTI and transmitting the PDSCH to one or more devices in a wireless network. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figures 1 to 4 An example of a wireless communication system supporting system information (SI) for access and backhaul in accordance with aspects of the present disclosure is illustrated.

[0056] Figure 5 An example of a process flow to support SI for access and backhaul according to aspects of the present disclosure is illustrated.

[0057] Figure 6 and 7 A block diagram of a device supporting SI for access and backhaul is shown in accordance with aspects of the present disclosure.

[0058] Figure 8 A block diagram of a device supporting SI for access and backhaul is shown in accordance with aspects of the present disclosure.

[0059] Figure 9 A diagram of a system including user equipment (UE) supporting SI for access and backhaul is shown in accordance with aspects of the present disclosure.

[0060] Figure 10 A diagram of a system including a base station supporting SI for access and backhaul is shown in accordance with aspects of the present disclosure.

[0061] Figures 11 to 16 A flow chart illustrating a method of supporting SI for access and backhaul according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0062] Some wireless communication systems, such as those deploying New Radio (NR) technology, may include an access node (AN) to facilitate wireless communications between user equipment (UE) and the network. In some cases, an anchor AN or integrated access backhaul (IAB) donor node may have a high-capacity, wired, backhaul connection (e.g., fiber) to the network while communicating with one or more ANs (e.g., relays) or UEs. A network that supports communications between an AN and a UE may be referred to as an access network, while a network that supports communications between one or more ANs may be referred to as a backhaul network. In deployments that support both access and backhaul (e.g., in an IAB network), standard access communication configurations may be restrictive in backhaul communications.

[0063] In general, the described techniques provide system information (SI) configuration specific to an access or backhaul procedure. In some cases, an AN may send random access channel (RACH) configuration information to devices within its cell. Separate SI for access and backhaul procedures may indicate different configurations for RACH procedures depending on whether the procedure is associated with backhaul or access. A receiving AN may indicate the SI to devices in a cell via a common master information block (MIB). The MIB may point devices to a search space, allowing them to receive additional (e.g., remaining) SI. The search space may be the same search space for both access and backhaul, or alternatively, a common MIB may point devices to separate search spaces for access and backhaul procedures. The receiving AN may indicate the remaining SI to the device, which is specific to the backhaul or access procedure. For RACH procedures, separate SI for backhaul and access procedures may enable the receiving AN to receive and / or transmit RACH preambles for both access and backhaul procedures.

[0064] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Various aspects of the present disclosure are subsequently illustrated and described with reference to process flows. Various aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to system information for access and backhaul.

[0065] Figure 1 An example of a wireless communication system 100 that supports system information for access and backhaul according to various aspects of the present disclosure is illustrated. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 can be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some cases, the wireless communication system 100 can support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices.

[0066] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next-generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home eNode B, a distributed unit (DU), a central unit (CU), or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be capable of communicating with various types of base stations 105 and network equipment (including macro eNBs, small cell eNBs, gNBs, relay base stations, DUs, CUs, etc.).

[0067] Each base station 105 may be associated with a particular geographic coverage area 110 in which it supports communications with various UEs 115. Each base station 105 may provide communication coverage for the respective geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, while uplink transmissions may also be referred to as reverse link transmissions.

[0068] The geographic coverage area 110 of a base station 105 can be divided into sectors that constitute only a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macrocell, a small cell, a hotspot, or other types of cells, or various combinations thereof. In some examples, a base station 105 can be mobile and, therefore, provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and the overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0069] The term "cell" refers to a logical communication entity used to communicate with base station 105 (e.g., on a carrier) and can be associated with an identifier to distinguish between adjacent cells operating via the same or different carriers (e.g., physical cell identifier (PCID), virtual cell identifier (VCID)). In some examples, a carrier can support multiple cells, and different cells can be configured according to different protocol types that can provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or other). In some cases, the term "cell" can refer to a portion of the geographic coverage area 110 (e.g., a sector) on which the logical entity operates.

[0070] UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where "device" can also be referred to as a unit, a station, a terminal, or a client. For example, UE 115 can be referred to as a mobile terminal (MT). UE 115 can also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which can be implemented in various items (such as appliances, vehicles, meters, etc.).

[0071] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that incorporate sensors or meters to measure or capture information and relay that information to a central server or application, which may utilize the information or present it to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0072] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating on a limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission-critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communication for these functions.

[0073] In some cases, a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in the group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for the D2D communication. In other cases, the D2D communication is performed between the UEs 115 without involving the base station 105.

[0074] The base stations 105 can communicate with the core network 130 and with each other. For example, the base stations 105 can interface with the core network 130 via a backhaul link 132 (e.g., via S1 or other interfaces). The base stations 105 can communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) over a backhaul link 134 (e.g., via X2 or other interfaces).

[0075] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be delivered through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, intranet(s), IP multimedia subsystem (IMS), or packet switched (PS) streaming services.

[0076] At least some network devices (such as base stations 105) may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with various UEs 115 through a number of other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 105).

[0077] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally speaking, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or the decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves can penetrate various structures sufficiently for macrocells to provide service to UEs 115 located indoors. Transmissions using UHF waves can be associated with smaller antennas and a shorter range (e.g., less than 100 km) compared to transmissions using the lower frequencies and longer wavelengths in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0078] The wireless communication system 100 may also operate in the very high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band). The SHF region includes frequency bands that may be opportunistically used by devices that can tolerate interference from other users, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band.

[0079] The wireless communication system 100 may also operate in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), which is also referred to as the millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be even smaller and more closely spaced than the UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be employed across transmissions using one or more different frequency regions, and the use of frequency bands specified across these frequency regions may differ by country or regulatory agency.

[0080] In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band (such as the 5 GHz ISM band). When operating in an unlicensed radio frequency spectrum band, wireless devices (such as base stations 105 and UEs 115) may employ a listen-before-talk (LBT) procedure to ensure that the frequency channel is clear before transmitting data. In some cases, operations in the unlicensed band may be based on a CA configuration (e.g., LAA) in coordination with CCs operating in the licensed band. Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of the two.

[0081] In some examples, base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input, multiple-output (MIMO) communication, or beamforming. For example, wireless communication system 100 may employ a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE 115), where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may exploit multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, a receiving device may receive multiple signals via different antennas or different antenna combinations. Each of these multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0082] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals communicated via antenna elements of an antenna array so that signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals communicated via the antenna elements can include the transmitting device or the receiving device applying a specific amplitude and phase shift to the signals carried via each antenna element associated with the device. The adjustments associated with each antenna element can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0083] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions, which may include a signal being transmitted according to different sets of beamforming weights associated with different transmission directions. The transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as the UE 115) a beam direction for subsequent transmission and / or reception by the base station 105. Some signals (such as data signals associated with a particular receiving device) may be transmitted by the base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as the UE 115). In some examples, the beam direction associated with the transmission along the single beam direction may be determined based at least in part on the signals transmitted in the different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report an indication of the signal it received with the highest signal quality or other acceptable signal quality to base station 105. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or for transmitting signals in a single direction (e.g., for transmitting data to a recipient device).

[0084] A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may attempt multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may attempt multiple receive directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal). A single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based at least in part on listening according to multiple beam directions).

[0085] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Similarly, a UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations.

[0086] In some cases, the wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be IP-based. In some cases, the radio link control (RLC) layer can perform packet segmentation and reassembly to communicate on the logical channel. The media access control (MAC) layer can perform priority handling and multiplex logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer, thereby improving link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection for the radio bearer supporting user plane data between the UE 115 and the base station 105 or the core network 130. At the physical (PHY) layer, the transport channel can be mapped to the physical channel.

[0087] In some cases, the UE 115 and the base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood that data is correctly received on the communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a particular time slot for data received in previous symbols in that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or based on some other time interval.

[0088] Time intervals in LTE or NR can be expressed in multiples of a basic time unit (which may refer to, for example, a sampling period Ts = 1 / 30720000 seconds). Time intervals of communication resources may be organized according to radio frames, each having a duration of 10 milliseconds (ms), where the frame period may be expressed as T f =307200T s. A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 time slots, each having a duration of 0.5 ms, and each time slot may contain 6 or 7 modulation code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). Excluding the cyclic prefix, each code element period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0089] In some wireless communication systems, a time slot can be further divided into multiple mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot can be the smallest scheduling unit. For example, the duration of each symbol can vary depending on the subcarrier spacing or the operating frequency band. Furthermore, some wireless communication systems can implement time slot aggregation, in which multiple time slots or mini-slots are aggregated and used for communication between UE 115 and base station 105.

[0090] The term "carrier" refers to a set of radio frequency spectrum resources that has a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an E-UTRA Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by the UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink communications and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)).

[0091] The organizational structure of a carrier can be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR, etc.). For example, communications on a carrier can be organized according to time intervals (TTIs) or time slots, each of which can include user data and control information or signaling to support decoding of the user data. A carrier can also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate carrier operations. In some examples (e.g., in a carrier aggregation configuration), a carrier can also have acquisition signaling or control signaling to coordinate the operations of other carriers.

[0092] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier using, for example, time division multiplexing (TDM), frequency division multiplexing (FDM), or a hybrid TDM-FDM technique. In some examples, control information transmitted in a physical control channel may be distributed in a concatenated manner across different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0093] A carrier may be associated with a particular bandwidth of radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0094] In a system employing MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate of the UE 115 can be. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and the use of multiple spatial layers may further increase the data rate of communication with the UE 115.

[0095] A device (e.g., base station 105 or UE 115) of wireless communication system 100 may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one carrier bandwidth in a set of carrier bandwidths. In some examples, wireless communication system 100 may include base stations 105 and / or UEs 115 that can support simultaneous communication via carriers associated with more than one different carrier bandwidth.

[0096] The wireless communication system 100 may support communication with a UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation (CA) or multi-carrier operation. The UE 115 may be configured with multiple downlink CCs and one or more uplink CCs according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0097] In some cases, the wireless communication system 100 may utilize an enhanced component carrier (eCC). An eCC may be characterized by one or more characteristics including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are unable to monitor the entire carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0098] In some cases, an eCC may utilize a different symbol duration than other CCs, which may include using a reduced symbol duration compared to the symbol duration of other CCs. The shorter symbol duration may be associated with increased spacing between adjacent subcarriers. A device utilizing an eCC (such as a UE 115 or a base station 105) may transmit a wideband signal (e.g., based on a 20, 40, 60, 80 MHz frequency channel or carrier bandwidth, etc.) with a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may include one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0099] Wireless communication systems, such as NR systems, can utilize any combination of licensed, shared, and unlicensed spectrum bands. The flexibility of eCC symbol duration and subcarrier spacing can allow eCCs to be used across multiple spectrums. In some examples, NR shared spectrum can improve spectrum utilization and frequency efficiency, particularly through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.

[0100] The wireless communication system 100 may include an AN, which may be implemented or supported by a base station 105 or a UE 115 supporting AN functionality (ANF) to facilitate wireless communication between the UE 115 and a network (e.g., a node of the core network 130). In some cases, the anchor AN may have a high-capacity, wired, backhaul connection (e.g., optical fiber) to the network while communicating with one or more ANs (e.g., relay devices) or UEs 115. A network that supports communication between an AN and a UE 115 may be referred to as an access network, while a network that supports communication between one or more ANs may be referred to as a backhaul network.

[0101] In a deployment that supports both access and backhaul (e.g., in an IAB network), the wireless communication system 100 may support access-specific SI and backhaul-specific SI. As described herein, SI may refer to any combination of remaining minimum SI (RMSI) and other SI (OSI). Accordingly, the backhaul SI, which may include backhaul RMSI and backhaul OSI, may be different from the access SI, which may include access RMSI and access OSI. Further, the SI-Radio Network Temporary Identifier (SI-RNTI), which may be used to scramble the content of a downlink message or generate a reference signal, may be different for access and backhaul. Access-specific and backhaul-specific SI may be used to configure the RACH procedure, depending on whether the RACH procedure is for access or backhaul.

[0102] Figure 2 An example of a wireless communication system 200 that supports SI for access and backhaul in accordance with aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. In some cases, the wireless communication system 200 can be an example of a wireless communication network operating in the mmW spectrum or supporting 5G NR deployment. The wireless communication system 200 can include several ANs 205 (AN 205-a, 205-b, 205-c, etc.) and UEs 115 that communicate over a combination of wired links 220 (e.g., wired links 220-a and 220-b) and wireless links 210. In some cases, the wired links 220 can be core network links and can connect the anchor ANs 205-h and 205-i to the core network (e.g., Figure 1 AN 205 may be a reference to the core network 130. Figure 1 Examples of the described AN (e.g., relay device, base station 105, DU, CU). UE 115 may be a reference Figure 1 Examples of UEs (eg, mobile terminals, mobile devices) are described.

[0103] In some examples, a complex backhaul topology can be handled by composing a topology from multiple overlapping star networks. For example, the wireless communication system 200 may include a mesh topology having at least two interfaces to a wired network. Additional ANs 205 may be directly or indirectly coupled to corresponding interfaces of the mesh topology via wireless links 210 (e.g., wireless links 210-a). This topology may include multiple star networks, some of which overlap with each other. Access node functions (ANFs) may be supported by the ANs 205 (e.g., ANs 205-b, 205-h, 205-i, etc.) of the mesh topology. UE functions (UEFs) may be configured on some or all of the ANs 205 of the wireless communication system 200. As a result, the ANs 205 may include multiple AN functions (ANFs) and UEFs that support the use of node functions and are configured for uplink and downlink data packet transmission according to active mode or suspended mode.

[0104] In some cases, each of the one or more radio links 210 may be associated with a radio resource of a RAT, thereby establishing resource functionality for access and backhaul traffic within the mesh topology. For example, AN 205-b may include one or more instances of a UEF, which may communicate with ANFs at ANs 205-h, 205-d, and 205-e. In some cases, ANs 205 may each communicate with each other using at least one ANF and at least one UEF, and may form an overlapping star network. Radio links may be associated with different sets of resources, where resources are collaboratively allocated according to a schedule established by the ANFs. Multiple star networks may use techniques for coordinating radio resources, which can efficiently handle system constraints (such as half-duplex communication, inter-link interference, etc.). For example, spatial division multiple access (SDMA) techniques (e.g., by using narrow beams) may be used to manage inter-link interference, and inter-node beam coordination may account for any remaining interference. In some examples, AN 205 may also include a routing table (RT), which may be used to determine where packets are directed. Each AN 205 may further include relay functionality, where a given AN 205 may relay transmissions between ANs 205 (eg, from a UE 115 to another AN 205), such as AN 205-e supporting communications between a network and a UE 115-e via AN 205-b.

[0105] Additionally or alternatively, mobile access may be integrated at one or more ANs 205 of the wireless communication system 200. Each AN 205 of the integrated mobile access may be configured to form a star topology with the UE 115. For example, AN 205-a may correspond to the center of the star topology of the integrated mobile access within the network. One or more UEs 115-a may be coupled to AN 205-a via one or more wireless links (e.g., wireless link 210-c). In some examples, mobile access links may also be added to an existing star network. In one example, AN 205-c may communicate with AN 205-h using wireless link 210-a. AN 205-g may further communicate with UE 115-d and AN 205-c over wireless link 210 (e.g., wireless link 210-e). In this example, both wireless links 210-a and 210-e share the same set of wireless resources to provide support for IAB. In some cases, a range of ANF and UEF combinations may be instantiated in the AN 205. Additional or different combinations of UEF and ANF instances in the AN 205 and Figure 2 Different topologies are possible that are not shown in FIG.

[0106] In an IAB network, synchronization between the various ANs 205 within the IAB is desirable. This synchronization can improve various aspects of the IAB, such as handover procedures. To achieve IAB network synchronization, inter-relay discovery can occur between the ANs 205 within the IAB. In some cases, as part of inter-relay discovery, an AN 205 within the IAB network can perform a RACH procedure with another AN 205 within the IAB network. The RACH procedure configuration can be specified by the receiving AN 205 via the inter-relay SI.

[0107] For example, AN 205-e may perform a backhaul RACH procedure with AN 205-b via wireless link 210d. The RACH procedure may include AN 205-e transmitting a RACH preamble to AN 205-b to establish a connection (e.g., with the network via anchor AN 205-h and AN 205-b acting as a relay). AN 205-e may transmit the RACH preamble to AN 205-b based on the backhaul RACH configuration. AN 205-b may receive the RACH preamble from AN 205-e and transmit a random access response, thereby allowing AN 205-e to establish a connection with AN 205-b.

[0108] In another example, UE 115-b may perform an access RACH procedure with AN 205-b. The RACH procedure may include UE 115-b transmitting a RACH preamble to AN 205-b in order to establish a connection with AN 205-b. UE 115-b may transmit the RACH preamble according to the access RACH configuration. In some cases, the access RACH configuration governing the transmission of the RACH preamble from UE 115-b may be different from the backhaul RACH configuration governing the transmission of the RACH preamble from AN 205-e to AN 205-b. For example, UE 115-b may transmit a RACH preamble to AN 205-b on a different time or frequency resource than that used by AN 205-e to transmit the RACH preamble to AN 205-b. In some cases, upon receiving the RACH preamble from UE 115-b, AN 205-b may transmit a random access response to UE 115-b. The random access response may enable UE 115 - b to establish a connection with AN 205 - b .

[0109] Figure 3 An example of a RACH procedure 300 supporting SI for access and backhaul according to aspects of the present disclosure is illustrated. In some examples, the RACH procedure 300 can implement aspects of wireless communication systems 100 and / or 200 and can be an example of a wireless communication network operating in the mmW spectrum. The RACH procedure 300 can be implemented by several UEs 115 and ANs 205-j communicating over a combination of wired and wireless links. The UE 115 can be a wireless UE as described with reference to FIG. Figure 1 and 2 An example of a UE 115 is described. The AN 205-j may be as described with reference to Figure 2 Example of AN 205 described.

[0110] In some cases, the UE 115 and the AN 205-j can transmit a RACH preamble 310 to another wireless device, such as a relay device (e.g., a base station, an AN, a UE supporting ANF), as described herein. Time and frequency resources can be reserved for RACH preamble transmission, which can be configured based on SI transmitted to each of the UE 115 and the AN 205-j (e.g., from a relay device or another wireless device). In some examples, the SI used to perform the backhaul RACH procedure can be different from the SI used to perform the access RACH procedure.

[0111] The RACH preamble 310 can have various formats. For example, the RACH preamble 310 can be in a short format or a long format, where each format supports different cell sizes. The RACH preamble 310 can also include a cyclic prefix (CP) 320, a payload (e.g., RACH Msg1 325), a guard time (GT) 330, and / or additional unused resources (e.g., resources during which no data transmission occurs). The CP 320 and GT 330 can be used to avoid interference with the previous subframe and the next subframe and can be related to the size of the cell radius. In some cases, a larger CP 320 and GT 330 can correspond to a larger cell radius.

[0112] During a designated set of time resources, which may be indicated in the SI, multiple devices may transmit RACH preambles to a relay device. For example, UE 115 may transmit RACH preamble 310 as part of an access RACH procedure, while AN 205-j may transmit RACH preamble 310-c as part of a backhaul RACH procedure. That is, AN 205-j may transmit according to the UEF to access another AN, while UE 115 may transmit according to the UEF to access a relay device.

[0113] However, the round trip time (RTT) of a RACH message for a backhaul RACH procedure (e.g., from AN 205-j) may be relatively large compared to the RTT of a RACH message for an access RACH procedure (e.g., from UE 115-g or UE 115-h). The different RTTs may be due to the access RACH procedure occurring within a single cell while the backhaul RACH procedure occurs between cells, which may result in a greater distance between the devices. In some examples, the RTT for the backhaul RACH procedure may be two, three, four, or five times longer than the RTT for the access procedure. Furthermore, the received power at the relay device for the backhaul RACH message may exceed the received power for the access RACH communication.

[0114] The relay device can configure the RACH preamble to account for the differences in access RACH and backhaul RACH communications. In some cases, the UE 115 and the AN 205-j can use a short format relative to a long format to compensate for different RTTs and link budgets. The relay device can also support multiplexing of multiple RACH preambles 310 (e.g., from the UE 115 and the AN 205-j). For example, the relay device can multiplex the RACH preamble 310-b from the UE 115-g on the same symbol as the RACH preamble 310-c from the AN 205-j. In addition, the relay device can utilize open-loop power control to balance the received power at the relay device from the UE 115 and the AN 205-j.

[0115] In some cases, although the time allocated for transmission of a RACH preamble may be the same as the time at which a device transmits the RACH preamble 310, different RTTs may cause the RACH preambles 310 from different devices to be received by the relay device at different times. For example, UE 115-g may have an RTT associated with its communication with a relay device that is also configured as an ANF. The RTT length may determine when the relay device receives the RACH preamble 310-a. UE 115-h may also have an RTT associated with its communication with the relay device. In some cases, the RTT for communication between UE 115-h and the relay device may be less than the RTT associated with communication between UE 115-g and the relay device. That is, the relay device may receive the RACH preamble 310-b from UE 115-h before receiving the RACH preamble 310-a from UE 115-g (e.g., because UE 115-h is closer to the relay device than UE 115-g).

[0116] In some cases, the RTT associated with communication between AN 205-j and the relay device may be greater than the RTT associated with communication between UE 115 and the relay device (e.g., because AN 205-j is farther away from the relay device than UE 115). The difference in RTT may cause the relay device to receive RACH preamble 310-c later than RACH preambles 310-a and 310-b. To accommodate this difference in reception time, the relay device may use a receiver algorithm to support RACH preamble detection for a wider range of RTTs, which may allow the relay device to detect access RACH preambles 310-a and 310-b and backhaul RACH preamble 310-c. For example, the backhaul RACH procedure may utilize a longer CP 320-c and a larger CS value. Alternatively, the relay device may not utilize any CS during the backhaul RACH procedure. In another example, the relay device may avoid scheduling any transmissions after the backhaul RACH procedure. Because the relay device may receive the backhaul RACH preamble 310-c later than the access preambles 310-a and 310-b, this may account for a larger RTT. By not scheduling transmissions directly after the RACH procedure, any backhaul RACH preamble 310-c received at a later time may still be detected by the relay device.

[0117] In some cases, backhaul RACH preamble 310-c may have a large link budget, which may cause AN 205-j to transmit a shorter preamble. Furthermore, AN 205-j may transmit backhaul RACH preamble 310-c at a higher transmission power than UE 115 transmits preambles 310-a and 310-b. Even in the case of a shorter RACH preamble 310-c transmission duration, the higher transmission power may allow for a higher probability of successful reception.

[0118] Figure 4 An example of a wireless communication system 400 that supports SI for access and backhaul according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 400 can implement aspects of the wireless communication system 100 or 200 and can be an example of a wireless communication network operating in the mmW spectrum. The wireless communication system 400 can include several UEs 115-i and ANs 205 that communicate over a combination of wired and wireless links.

[0119] The receiving AN 205-k may communicate with the AN 205-1 and the UE 115-i via a downlink channel 410 and an uplink channel 420. The receiving AN 205-k may transmit SI to the AN 205-1 and the UE 115-i. The AN 205-k may transmit SI via the MIB, RMSI, OSI, or a combination thereof. The MIB may include several SIBs transmitted via a non-scheduled physical broadcast channel (PBCH). The receiving AN 205-k may periodically transmit the PBCH within a synchronization signal (SS). For example, the AN 205-k may broadcast the MIB via an SS block in the downlink channel 410. The MIB may be shared across the entire cell, such that the AN 205-1 and the UE 115-i share the information contained in the MIB. In some cases, the MIB may indicate the search space or control resource set (CORESET) used for the RACH procedure to the devices in the cell (i.e., AN 205-1 and UE 115-i). The devices in the cell may monitor the search space indicated in the MIB. The receiving AN 205-k may indicate the SI-RNTI in the search space. The devices in the cell (i.e., AN 205-1 and UE 115-i) may use the RNTI to descramble downlink control information (DCI) sent from the receiving AN 205-k via the physical downlink control channel (PDCCH) in the downlink channel 410. For example, the device may use the RNTI to descramble some CRC bits of the PDCCH. The DCI may specify the timing and frequency resources where the AN 205-k may transmit additional SI (i.e., RMSI, SIB). In some examples, the RMSI may be transmitted via a scheduled transmission on the PDSCH. In some cases, a demodulation reference signal (DMRS) may be associated with the PDCCH or PDSCH. DMRS may be based on an access-specific RNTI. AN 205-1 and UE 115-1 may receive SI from AN 205-k. The SI may contain configuration information for future transmissions, such as those occurring in connection with RACH procedures. In some cases, the SI transmitted via downlink channel 410 may indicate to AN 205-1 and UE 115-i the time and / or frequency resources to use for RACH preambles, such as those transmitted via uplink channel 420.

[0120] In some cases, the receiving AN 205-k may configure the RACH procedures differently for the backhaul RACH with AN 205-1 and the access RACH with UE 115-i. The receiving AN 205-k may use the backhaul RMSI via channel 410-a to indicate the backhaul-specific RACH configuration. In some cases, the backhaul-specific RACH configuration may include different time-frequency resources for the RACH preamble. For example, the access device (such as UE 115-i) may use different time and / or frequency resources to transmit the access RACH preamble via uplink channel 420-b than the time and / or frequency resources that an AN (such as AN 205-1) may use to transmit the backhaul RACH preamble via uplink channel 420-a. Despite the differences between RACH preambles (e.g., RTT, power), different time and frequency resource configurations may allow the receiving AN 205-k to receive RACH preambles from both ANF devices (such as 205-k) and UEF devices (such as UE 115-i).

[0121] In some cases, there may be backhaul-specific SI and access-specific SI. For example, a common MIB may indicate separate search spaces or CORESETs for access RACH and backhaul RACH procedures to devices in a cell (i.e., AN 205-1 and UE 115-i). In some cases, the common MIB may be mapped to backhaul SI and access SI, respectively, according to corresponding relationship tables. For example, AN 205-1 may map the common MIB to backhaul SI (e.g., backhaul search space, backhaul CORESET) according to a first relationship table (e.g., a backhaul-specific relationship table). UE 115-i may map the common MIB to access SI (e.g., access search space, access CORESET) according to a second relationship table (e.g., an access-specific relationship table). In some aspects, the mapping of the common MIB to backhaul SI may be different from the mapping of the common MIB to access SI, and thus the first relationship table and the second relationship table may be different. This may cause AN 205-1 to interpret the shared MIB differently than UE 115-1. In some cases, UE 115-i may monitor only the access search space, while AN 205-1 may monitor both the access search space and the backhaul search space. AN 205-1 may have both an ANF and a UEF and, therefore, may require both access and backhaul SI. The receiving AN 205-k may indicate the SI-RNTI within each search space, where the SI-RNTI may be unique for access and backhaul.

[0122] In the case where AN 205-1 is a relay node configured with both an ANF and a UEF, AN 205-1 may have a different RMSI for backhaul than for access. In some cases, the receiving AN 205-k may transmit indications of both the backhaul RMSI and the access RMSI via the same frequency and time resources in channel 410-a. For example, AN 205-1 may use the same search space or CORESET to receive both the backhaul RMSI and the access RMSI via downlink channel 410-a. Alternatively, AN 205-1 may use different time and / or frequency resources for the backhaul RMSI and the access RMSI. For example, AN 205-k may transmit a common MIB for both backhaul and access RMSI via downlink channel 410-a, but AN 205-1 may interpret the frequency bits within the MIB differently for backhaul and access RMSI. This may be due to separate CORESETs or search spaces for backhaul SI and access SI. For example, there may be four bits within the MIB that indicate the frequency resources used for RMSI. AN 205-1 may reference a first lookup table to determine a set of frequency resources that may be used for access RMSI. Subsequently, AN 205-1 may use the same four bits but a different lookup table to determine a different set of frequency resources that may be used for backhaul RMSI.

[0123] In some examples, an additional IE may be used for RMSI in addition to the information element (IE) reserved for access RMSI. For example, the receiving AN 205-k may transmit both access and backhaul RMSI to the AN 205-1 via the downlink channel 410-a. In some instances, the AN 205-k may use an additional IE dedicated to RMSI. For example, the AN 205-k may utilize the IE reserved for RMSI to transmit both access RMSI and backhaul RMSI.

[0124] In some cases, RMSI may be beam-specific. For example, a receiving AN 205-k may use one beam set for backhaul RMSI transmission and a second beam set for access RMSI, which may have different beams. The receiving AN-205-k may use certain high-angle beams for backhaul RMSI and low-angle beams for access RMSI. In other cases, these sets may share one or more beams, or each beam may have an associated RS. That is, each beam associated with backhaul, access, or both may contain RSs including SS blocks and channel state information (CSI) RSs.

[0125] In some cases, the access device (UE 115-i) may only search for access RMSI. For example, backhaul AN 205-1 may be configured with both ANF and UEF and may search for both backhaul and access RMSI. However, access AN 115-i, which is configured only with UEF, may only search for access RMSI. If only backhaul RMSI is present, the receiving AN 205-k may not indicate the presence of RMSI to the access AN 115-i. In this case, the access AN 115-i may not search for any RMSI.

[0126] A device in the cell (i.e., AN 205-1 or UE 115-i) may transmit a RACH preamble to a receiving AN 205-k via channel 420 according to the SI configuration. In some cases, the backhaul RACH preamble transmitted by AN 205-1 via 420-a may be configured differently from the access RACH preamble transmitted by UE 115-i via 420-b. For example, the backhaul RACH preamble and the access RACH preamble may have different resource allocations, timing criteria, formats, etc. In some cases, AN 205-1 may transmit a RACH preamble according to the backhaul configuration and determine that the transmission was unsuccessful. This determination may be based on not receiving a response, receiving a negative acknowledgment response, or other factors. After determining that the first transmission of the RACH preamble was unsuccessful, AN 205-1 may retransmit the RACH preamble according to the access configuration.

[0127] In some cases, relay device AN 205-1 may receive both access and backhaul RACH configurations from receiver AN 205-k. In this case, AN 205-1 may use the backhaul RACH configuration for RACH procedures with AN 205-k. AN 205-1 may use the access RACH configuration for communications with other devices in its cell. For example, AN 205-1 may receive the access RACH configuration and transmit SI based on the received access RACH configuration. AN 205-1 may transmit the MIB in the SS and the RMSI sent from receiver AN 205-k to AN 205-1 via the PDSCH, indicating the same access RACH configuration.

[0128] Figure 5An example of a process flow 500 for supporting SI for access and backhaul according to aspects of the present disclosure is illustrated. In some examples, the process flow 500 can implement aspects of the wireless communication system 100 or 200. In the following description of the process flow 500, operations between the receiving node 205-m and the node 205-n and the UE 115-j can correspond to uplink or downlink signaling on a wireless backhaul link and / or a wireless link. The receiving AN 205-m and AN 205-n can be configured with both ANF and UE 115-j functionality, while the UE 115-j can be configured only for UE 115.

[0129] At 510, the receiving AN 205-m may transmit an access SI configuration indicating an access search space and an access CORESET to the UE 115-j. The access SI configuration may indicate one or both of the access search space and the access CORESET. In response, at 525, the UE 115-j may monitor the access search space and the access CORESET for an access-specific SI-RNTI.

[0130] At 520, the receiving node 205-m may transmit a backhaul SI configuration to the AN 205-n. The backhaul SI may indicate one or both of a search space and a CORESET for SI granting. At 530, the AN 205-n may monitor the backhaul search space and the backhaul CORESET indicated by the backhaul SI configuration received at 520. The AN 205-n may monitor a backhaul-specific SI-RNTI. In some cases, the access and backhaul SI-RNTIs are different. Furthermore, at least a portion of the backhaul search space may be identical to a portion of the access search space. In some instances, at least a portion of the backhaul CORESET may be identical to a portion of the access CORESET.

[0131] At 535, the receiving node 205-m transmits an access SI grant to the UE 115-j. In some cases, the UE 115-j may receive the access SI grant via the PDCCH. The access SI grant may schedule an SI message via the PDSCH. In some cases, the UE 115-j may use the access SI-RNTI received at 510 to descramble one or more CRC bits of the PDCCH.

[0132] The receiving AN 205-m may transmit a backhaul SI grant to the AN 205-n at 540. In some cases, the AN 205-n may receive the backhaul SI grant via the PDCCH, where the backhaul SI grant schedules the SI message via the PDSCH.

[0133] At 545, UE 115-j may send a random access message to recipient AN 205-m. The random access message may be sent according to the configuration indicated in the access SI. At 550, UE 115-j may access recipient AN 205-m based on the access SI.

[0134] At 555, AN 205-n may send a random access message to the receiving AN 205-m. AN 205-n may send the random access message based on the backhaul SI. In some cases, 205-n may determine that the transmission was unsuccessful and send a second random access message based on the access SI. At 560, AN 205-n may access the receiving node 205-m based on the backhaul SI, the access SI, or both.

[0135] Figure 6 A block diagram 600 is shown of a device 605 that supports SI for access and backhaul according to aspects of the present disclosure. The device 605 can be an example of aspects of a UE 115 or a base station 105 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0136] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to system information for access and backhaul, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 9 and 10 Examples of aspects of the described transceiver 920 or 1020. The receiver 610 may utilize a single antenna or a collection of antennas.

[0137] The communication manager 615 may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network; determine a backhaul SI for communication with the network node or another network node of the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cellular cell supported by the relay device; and access the network node or the other network node based on the backhaul SI, the access SI, or both. The communication manager 615 may also receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network; determine an access SI for one or more devices to access a cellular cell supported by the relay device based on the access SI configuration, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node of the wireless network; and transmit a synchronization signal (SS) indicating the access SI to one or more devices in the wireless network. The communication manager 615 may be an example of aspects of the communication manager 910 or 1010 as described herein.

[0138] The communication manager 615 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0139] The communication manager 615 or its subcomponents can be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0140] The transmitter 620 may transmit signals generated by other components of the device 605. In some examples, the transmitter 620 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 620 may be a reference Figure 9 and 10 Examples of aspects of the depicted transceiver 920 or 1020. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0141] Figure 7 A block diagram 700 of a device 705 supporting SI for access and backhaul according to aspects of the present disclosure is shown. The device 705 can be an example of aspects of the device 605, UE 115, or base station 105 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 750. The device 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0142] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to system information for access and backhaul, etc.). The information may be passed to other components of the device 705. The receiver 710 may be a reference Figure 9 and 10 Examples of aspects of the described transceiver 920 or 1020. The receiver 710 may utilize a single antenna or a collection of antennas.

[0143] The communication manager 715 may be an example of aspects of the communication manager 615 as described herein. The communication manager 715 may include an SI configuration component 720, a backhaul SI component 725, an access SI component 730, an access SI receiver 735, an access SI configuration manager 740, and an SS transmitter 745. The communication manager 715 may be an example of aspects of the communication manager 910 or 1010 as described herein.

[0144] SI configuration component 720 can receive, at a relay device in the wireless network, a backhaul SI configuration from a network node in the wireless network.

[0145] The backhaul SI component 725 can determine a backhaul SI for communication with the network node or another network node of the wireless network based on the backhaul SI configuration, where the backhaul SI is different from the access SI used by one or more wireless devices to access a cellular cell supported by the relay device.

[0146] The access SI component 730 can access the network node or the other network node based on the backhaul SI, the access SI, or both.

[0147] The access SI receiver 735 may receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network.

[0148] The access SI configuration manager 740 may determine an access SI for one or more devices to access a cell supported by the relay device based on the access SI configuration, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node of the wireless network.

[0149] The SS transmitter 745 may transmit an SS indicating an access SI to one or more devices in the wireless network.

[0150] The transmitter 750 may transmit signals generated by other components of the device 705. In some examples, the transmitter 750 may be co-located with the receiver 710 in a transceiver module. For example, the transmitter 750 may be a reference Figure 9 and 10 Examples of aspects of the described transceiver 920 or 1020. The transmitter 750 may utilize a single antenna or a collection of antennas.

[0151] Figure 8 A block diagram 800 is shown of a communication manager 805 that supports SI for access and backhaul according to aspects of the present disclosure. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include an SI configuration component 810, a backhaul SI component 815, an access SI component 820, an SI grant component 825, a random access component 830, an access SI transmitter 835, a backhaul SI transmitter 840, an access SI receiver 845, an access SI configuration manager 850, an SS transmitter 855, and an access SI configuration transmitter 860. Each of these modules can communicate directly or indirectly with each other (e.g., via one or more buses).

[0152] SI configuration component 810 may receive a backhaul SI configuration at a relay device in the wireless network from a network node in the wireless network. In some examples, SI configuration component 810 may receive an access SI configuration at the relay device that indicates an access search space and an access CORESET. In some examples, SI configuration component 810 may receive the access SI configuration at the relay device from a network node in the wireless network. In some examples, SI configuration component 810 may receive a broadcast channel including a common MIB from the network node. In some examples, SI configuration component 810 may receive DCI from the network node. In some cases, the backhaul SI configuration indicates one or both of a search space and a CORESET for SI grant. In some cases, the access-specific SI-RNTI and the backhaul-specific SI-RNTI are different. In some cases, at least a portion of the backhaul search space is identical to at least a portion of the access search space. In some cases, at least a portion of the backhaul CORESET is identical to at least a portion of the access CORESET. In some cases, the access SI configuration indicates one or both of a search space and a CORESET for SI grant. In some cases, the backhaul SI includes a different CORESET or search space than the access SI.

[0153] The backhaul SI component 815 may determine a backhaul SI for communication with the network node or another network node of the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by a relay device. In some examples, the backhaul SI component 815 may monitor the backhaul search space and the backhaul CORESET indicated by the backhaul SI configuration for a backhaul-specific SI-RNTI. In some examples, the backhaul SI component 815 may determine the backhaul CORESET or backhaul search space for communication with the network node based on a common MIB. In some examples, the backhaul SI component 815 may monitor the backhaul CORESET or backhaul search space for a backhaul-specific SI-RNTI. In some examples, the backhaul SI component 815 may determine the backhaul CORESET or backhaul search space based on a backhaul-specific relationship table that maps the common MIB to the backhaul CORESET or backhaul search space. In some examples, backhaul SI component 815 can receive backhaul RMSI using a second set of transmission beams, where at least one transmission beam in the second set of transmission beams is in a different direction than at least one transmission beam in the first set of transmission beams.

[0154] In some cases, the backhaul SI includes a backhaul-specific SI-RNTI, an access-specific SI-RNTI for access SI, or a combination thereof. In some cases, the content of the RMSI of one or more reference signals (RSs) is backhaul-specific, where the one or more RSs include SS blocks or CSI RSs. In some cases, the RSs may be associated with different transmission beam directions. In some cases, the content of the backhaul-specific RMSI for a first RS is different from the content of the backhaul-specific RMSI for a second RS that is different from the first RS.

[0155] The access SI component 820 may access the network node or the other network node based on the backhaul SI, the access SI, or both. In some examples, the access SI component 820 may receive an SS indicating the access SI at the relay device. In some examples, the access SI component 820 may monitor the access search space and the access CORESET for an access-specific SI-RNTI. In some examples, the access SI component 820 may determine an access SI for one or more wireless devices to access a cell supported by the relay device based on the access SI configuration. In some examples, the access SI component 820 may determine the access CORESET or access search space based on a common MIB, where the access CORESET is different from the backhaul CORESET or the access search space is different from the backhaul search space. In some examples, the access SI component 820 may determine the access CORESET or access search space based on an access-specific relationship table that maps the common MIB to the access CORESET or access search space. In some examples, the access SI component 820 can determine an access CORESET or an access search space based on the common MIB, wherein the access CORESET is different from the backhaul CORESET or the access search space is different from the backhaul search space. In some examples, the access SI component 820 can receive an SS indicating the access SI to one or more devices in the wireless network based on the access CORESET or the access search space.

[0156] In some examples, the access SI component 820 may receive the access RMSI using a first transmission beam set. In some examples, the access SI component 820 may monitor the search space indicated by the access SI for an access-specific RNTI. In some examples, the access SI component 820 may scramble the DCI based on the access-specific RNTI. In some examples, the access SI component 820 may generate a demodulation reference signal (DMRS) based on the access-specific RNTI. In some examples, the access SI component 820 may generate a PDSCH based on the access-specific RNTI. In some examples, the access SI component 820 may descramble the DCI based on the access-specific RNTI. In some cases, the DMRS is associated with the PDCCH or PDSCH. In some examples, the access SI component 20 may generate the DMRS based on the access-specific RNTI. In some instances, the access SI component 20 may generate the PDSCH based on the access-specific RNTI. In some examples, access SI component 820 can receive DMRS from a network node based on an access-specific RNTI. In some examples, access SI component 820 can receive PDSCH from a network node based on an access-specific RNTI. In some cases, DMRS is associated with PDCCH or PDSCH.

[0157] SI grant component 825 can receive a PDCCH conveying an SI grant based on the backhaul SI configuration, wherein the SI grant schedules an SI message via the PDSCH.

[0158] In some examples, SI grant component 825 can receive a PDCCH conveying an SI grant based on an access SI configuration, wherein the SI grant schedules an SI message via a PDSCH. In some examples, SI grant component 825 can descramble one or more CRC bits using an access SI-RNTI. In some examples, SI grant component 825 can transmit a PDCCH conveying an SI grant based on an access SI configuration, wherein the SI grant schedules an SI message via a PDSCH. In some examples, SI grant component 825 can scramble one or more CRC bits using an access SI-RNTI.

[0159] The random access component 830 may transmit a first random access message to the network node or another network node based on the backhaul SI. In some examples, the random access component 830 may determine that the random access procedure was unsuccessful based on transmitting the first random access message. In some examples, the random access component 830 may transmit a second random access message to the network node or another network node based on the access SI.

[0160] The access SS transmitter 835 may transmit an SS indicating access SI to one or more devices in the wireless network. In some examples, the access SI transmitter 835 may transmit an SS indicating access SI to one or more devices in the wireless network based on an access CORESET or an access search space. In some examples, the access SI transmitter 835 may transmit access RMSI using a first transmission beam set. In some examples, the access SI transmitter 835 may transmit scrambled DCI to one or more devices in the wireless network. In some cases, DMRS is associated with PDCCH or PDSCH. In some examples, the access SI transmitter 835 may transmit DMRS to one or more devices in the wireless network. In some examples, the access SI transmitter 835 may transmit PDSCH to one or more devices in the wireless network. In some cases, DMRS is associated with PDCCH or PDSCH.

[0161] The backhaul SI transmitter 840 may transmit the backhaul RMSI using a second transmission beam set, wherein at least one transmission beam in the second transmission beam set is in a different direction from at least one transmission beam in the first transmission beam set.

[0162] The access SI receiver 845 may receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network.

[0163] The access SI configuration manager 850 may determine, based on the access SI configuration, an access SI for one or more devices to access a cell supported by a relay device, wherein the access SI is different from the backhaul SI used for communication with the network node or another network node in the wireless network. In some examples, the access SI configuration manager 850 may transmit an access SI configuration indicating an access search space and an access CORESET to the one or more devices. In some examples, the access SI configuration manager 850 may scramble the DCI based on an access-specific RNTI. In some examples, the access SI configuration manager 850 may generate a DMRS based on an access-specific RNTI. In some examples, the access SI configuration manager 850 may generate a PDSCH based on an access-specific RNTI.

[0164] The SS transmitter 855 may transmit an SS indicating access SI to one or more devices in the wireless network.

[0165] The access SI configuration transmitter 860 may transmit scrambled DCI to one or more devices in the wireless network. In some examples, the access SI configuration transmitter 860 may transmit DMRS to one or more devices in the wireless network. In some examples, the access SI configuration transmitter 860 may transmit PDSCH to one or more devices in the wireless network.

[0166] Figure 9 A diagram of a system 900 including a device 905 supporting SI for access and backhaul according to various aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 as described herein, or include components thereof. The device 905 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 910, a transceiver 920, an antenna 925, a memory 930, a processor 940, and an I / O controller 950. These components may be in electronic communication via one or more buses (e.g., bus 955).

[0167] The communication manager 910 may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network; determine a backhaul SI for communication with the network node or another network node in the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cellular cell supported by the relay device; and access the network node or the another network node based on the backhaul SI, the access SI, or both. The communication manager 910 may also receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network; determine an access SI for one or more devices to access a cellular cell supported by the relay device based on the access SI configuration, wherein the access SI is different from the backhaul SI used for communication with the network node or another network node in the wireless network; and transmit an SS indicating the access SI to one or more devices in the wireless network.

[0168] The transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 920 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate packets received from the antenna.

[0169] In some cases, a wireless device may include a single antenna 925. However, in some cases, the device may have more than one antenna 925, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0170] The memory 930 may include RAM, ROM, or a combination thereof. The memory 930 may store computer-readable code 935 including instructions that, when executed by a processor (e.g., processor 940), cause the device to perform the various functions described herein. In some cases, the memory 930 may include, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0171] The processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., various functions or tasks of supporting SI for access and backhaul).

[0172] I / O controller 950 can manage input and output signals for device 905. I / O controller 950 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 950 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 950 can utilize an operating system, such as or another known operating system. In other cases, I / O controller 950 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 950 may be implemented as part of a processor. In some cases, a user may interact with device 905 via I / O controller 950 or via hardware components controlled by I / O controller 950.

[0173] The code 935 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, the code 935 may not be directly executed by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0174] Figure 10 A diagram of a system 1000 including a device 1005 supporting SI for access and backhaul according to various aspects of the present disclosure is shown. The device 1005 may be an example of or include components of the device 605, device 705, or base station 105 as described herein. The device 1005 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1010, a network communication manager 1015, a transceiver 1020, an antenna 1025, a memory 1030, a processor 1040, and an inter-station communication manager 1045. These components may be in electronic communication via one or more buses (e.g., bus 1055).

[0175] The communication manager 1010 may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network; determine a backhaul SI for communication with the network node or another network node in the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cellular cell supported by the relay device; and access the network node or the another network node based on the backhaul SI, the access SI, or both. The communication manager 1010 may also receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network; determine an access SI for one or more devices to access a cellular cell supported by the relay device based on the access SI configuration, wherein the access SI is different from the backhaul SI used for communication with the network node or another network node in the wireless network; and transmit an SS indicating the access SI to one or more devices in the wireless network.

[0176] The network communications manager 1015 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1015 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0177] The transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1020 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate packets received from the antenna.

[0178] In some cases, a wireless device may include a single antenna 1025. However, in some cases, the device may have more than one antenna 1025, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0179] The memory 1030 may include RAM, ROM, or a combination thereof. The memory 1030 may store computer-readable code 1035 including instructions that, when executed by a processor (e.g., processor 1040), cause the device to perform the various functions described herein. In some cases, the memory 1030 may include, among other things, a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0180] The processor 1040 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1040 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause the device 1005 to perform various functions (e.g., various functions or tasks of supporting SI for access and backhaul).

[0181] The inter-site communication manager 1045 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with the UE 115 in coordination with the other base stations 105. For example, the inter-site communication manager 1045 can coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1045 can provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between the base stations 105.

[0182] The code 1035 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1035 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, the code 1035 may not be directly executed by the processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0183] Figure 11 1 is a flow chart illustrating a method 1100 for supporting SI for access and backhaul according to aspects of the present disclosure. The operations of the method 1100 may be implemented by a UE 115 or a base station 105 as described herein, or components thereof. For example, the operations of the method 1100 may be implemented by a UE 115 or a base station 105 as described herein, or components thereof. Figures 6 to 10 In some examples, a UE or base station may execute an instruction set to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, the UE or base station may use dedicated hardware to perform various aspects of the functions described below.

[0184] At 1105, the UE or base station may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network. The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed as described with reference to Figures 6 to 10 The SI configuration components described are executed.

[0185] At 1110, the UE or base station may determine a backhaul SI for communication with the network node or another network node in the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by a relay device. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0186] At 1115, the UE or base station may access the network node or the other network node based on the backhaul SI, the access SI, or both. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed as described with reference to Figures 6 to 10 The described access SI component is executed.

[0187] Figure 12 1 is a flow chart illustrating a method 1200 for supporting SI for access and backhaul according to aspects of the present disclosure. The operations of the method 1200 may be implemented by a UE 115 or a base station 105 or components thereof as described herein. For example, the operations of the method 1200 may be implemented by a UE 115 or a base station 105 as described herein. Figures 6 to 10 In some examples, a UE or base station may execute an instruction set to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, the UE or base station may use dedicated hardware to perform various aspects of the functions described below.

[0188] At 1205, the UE or base station may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network. The operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed as described with reference to Figures 6 to 10 The SI configuration components described are executed.

[0189] At 1210, the UE or base station may monitor the backhaul search space and backhaul CORESET indicated by the backhaul SI configuration to find the SI-RNTI that is specific to the backhaul. The operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0190] At 1215, the UE or base station may receive a PDCCH conveying an SI grant based on the backhaul SI configuration, wherein the SI grant schedules an SI message via the PDSCH. The operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0191] At 1220, the UE or base station may determine a backhaul SI for communication with the network node or another network node in the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by a relay device. The operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0192] At 1225, the UE or base station may access the network node or the other network node based on the backhaul SI, the access SI, or both. The operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be performed as described with reference to Figures 6 to 10 The described access SI component is executed.

[0193] Figure 13 1 is a flow chart illustrating a method 1300 for supporting SI for access and backhaul according to aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE 115 or a base station 105 or components thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE 115 or a base station 105 or components thereof as described herein. Figures 6 to 10 In some examples, a UE or base station may execute an instruction set to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, the UE or base station may use dedicated hardware to perform various aspects of the functions described below.

[0194] At 1305, the UE or base station may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed as described with reference to Figures 6 to 10 The SI configuration components described are executed.

[0195] At 1310, the UE or base station may receive an access SI configuration indicating an access search space and an access CORESET at a relay device. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed as described with reference to Figures 6 to 10The SI configuration components described are executed.

[0196] At 1315, the UE or base station may monitor the backhaul search space and backhaul CORESET indicated by the backhaul SI configuration to find the SI-RNTI that is specific to the backhaul. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0197] At 1320, the UE or base station may monitor the access search space and the access CORESET to find the access-specific SI-RNTI. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed as described with reference to Figures 6 to 10 The described access SI component is executed.

[0198] At 1325, the UE or base station may determine a backhaul SI for communication with the network node or another network node in the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by a relay device. The operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0199] At 1330, the UE or base station may access the network node or the other network node based on the backhaul SI, the access SI, or both. The operations of 1330 may be performed according to the methods described herein. In some examples, aspects of the operations of 1330 may be performed as described with reference to Figures 6 to 10 The described access SI component is executed.

[0200] Figure 14 14. A flow chart illustrating a method 1400 for supporting SI for access and backhaul according to aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE 115 or a base station 105 or components thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or a base station 105 as described herein. Figures 6 to 10 In some examples, a UE or base station may execute an instruction set to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, the UE or base station may use dedicated hardware to perform various aspects of the functions described below.

[0201] At 1405, the UE or base station may receive a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described with reference to Figures 6 to 10 The SI configuration components described are executed.

[0202] At 1410, the UE or base station may determine a backhaul SI for communication with the network node or another network node in the wireless network based on the backhaul SI configuration, wherein the backhaul SI is different from an access SI used by one or more wireless devices to access a cell supported by a relay device. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 6 to 10 The described backhaul SI components are performed.

[0203] At 1415, the UE or base station may access the network node or the other network node based on the backhaul SI, the access SI, or both. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described with reference to Figures 6 to 10 The described access SI component is executed.

[0204] At 1420, the UE or base station may transmit a first random access message to the network node or another network node based on the backhaul SI. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of block 1420 may be performed as described with reference to Figures 6 to 10 The random access component described is performed.

[0205] Figure 15 1 is a flow chart illustrating a method 1500 for supporting SI for access and backhaul according to aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE 115 or a base station 105 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or a base station 105 as described herein. Figures 6 to 10 In some examples, a UE or base station may execute an instruction set to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, the UE or base station may use dedicated hardware to perform various aspects of the functions described below.

[0206] At 1505, the UE or base station may receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 6 to 10 The described access is performed by the SI receiver.

[0207] At 1510, the UE or base station may determine an access SI for one or more devices to access a cell supported by a relay device based on the access SI configuration, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node in the wireless network. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 6 to 10 The described access SI configuration manager is used to perform the operation.

[0208] At 1515, the UE or base station may transmit an SS indicating access SI to one or more devices in the wireless network. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 6 to 10 The SS transmitter described is implemented.

[0209] Figure 16 1. A flow chart illustrating a method 1600 for supporting SI for access and backhaul according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a UE 115 or a base station 105 as described herein, or components thereof. For example, the operations of the method 1600 may be implemented by a UE 115 or a base station 105 as described herein, or components thereof. Figures 6 to 10 In some examples, a UE or base station may execute an instruction set to control the functional elements of the UE or base station to perform the functions described below. Additionally or alternatively, the UE or base station may use dedicated hardware to perform various aspects of the functions described below.

[0210] At 1605, the UE or base station may receive an access SI configuration and a backhaul SI configuration from a network node in the wireless network at a relay device in the wireless network. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 6 to 10 The described access is performed by the SI receiver.

[0211] At 1610, the UE or base station may determine an access SI for one or more devices to access a cell supported by a relay device based on the access SI configuration, wherein the access SI is different from a backhaul SI used for communication with the network node or another network node in the wireless network. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 6 to 10 The described access SI configuration manager is used to perform the operation.

[0212] At 1615, the UE or base station may transmit an access SI configuration indicating an access search space and an access CORESET to one or more devices. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 6 to 10 The described access SI configuration manager is used to perform the operation.

[0213] At 1620, the UE or base station may scramble the DCI based on the access-specific RNTI. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be as described with reference to Figures 6 to 10 The described access SI configuration manager is used to perform the operation.

[0214] At 1625, the UE or base station may transmit the scrambled DCI to one or more devices in the wireless network. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 6 to 10 The described access SI configuration transmitter is performed.

[0215] At 1630, the UE or base station may transmit an SS indicating access SI to one or more devices in the wireless network. The operations of 1630 may be performed according to the methods described herein. In some examples, aspects of the operations of 1630 may be performed as described with reference to Figures 6 to 10 The SS transmitter described is implemented.

[0216] It should be noted that the above methods describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0217] The techniques described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems. CDMA systems can implement radio technologies such as CDMA2000 and Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 versions are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0218] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). The techniques described herein may be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used throughout much of the description, the techniques described herein may also be applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0219] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 115 that have a service subscription with a network provider. Small cells may be associated with lower-power base stations 105 (compared to macro cells), and may operate in the same or different frequency bands (e.g., licensed, unlicensed, etc.) as the macro cell. According to various examples, small cells may include pico cells, femto cells, and micro cells. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access by UEs 115 that have a service subscription with a network provider. A femto cell may also cover a smaller geographic area (e.g., a residence) and may provide restricted access by UEs 115 associated with the femto cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 of users in a residence, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB may support one or more (eg, two, three, four, etc.) cells and may also support communication using one or more component carriers.

[0220] One or more wireless communication systems 100 described herein may support synchronous or asynchronous operation. For synchronous operation, base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operation.

[0221] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0222] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed with a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may 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).

[0223] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or code. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0224] Computer-readable media include both non-transient computer storage media and communication media, including any media that facilitates the transfer of a computer program from one place to another. Non-transient storage media can be any available media that can be accessed by a general or special-purpose computer. As an example and not limitation, non-transient computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage device, or any other non-transient medium that can be used to carry or store the desired program code means in the form of instructions or data structures and can be accessed by a general or special-purpose computer, or a general or special-purpose processor. Any connection is also properly referred to as 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 microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of medium. Disk and disc, as used herein, include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0225] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Likewise, as used herein, the phrase "based on" should not be read as referencing a closed set of conditions. For example, an exemplary step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be read in the same manner as the phrase "based at least in part on."

[0226] In the accompanying drawings, similar components or features may have the same reference number. In addition, components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between the similar components. If only the first reference number is used in the specification, the description applies to any of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0227] The description set forth herein in conjunction with the accompanying drawings describes example configurations and does not represent all examples that can be implemented or fall within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration" and does not mean "superior to" or "over other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0228] The description herein is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: Receiving, at a relay device in a wireless network, an access system information (SI) configuration and a backhaul SI configuration from a network node in the wireless network; determining an access SI for one or more devices in the wireless network to access a cell supported by the relay device based at least in part on the access SI configuration indicating an access search space to be monitored for an access specific SI-Radio Network Temporary Identifier (SI-RNTI), wherein the access SI is different from a backhaul SI used for communication with the network node or another network node in the wireless network, and wherein the access search space is different from a backhaul search space indicated by the backhaul SI configuration; and A synchronization signal SS indicating the access SI is transmitted to the one or more devices.

2. The method of claim 1, wherein at least one of the relay device and the network node is an Integrated Access Backhaul (IAB) node. The method of claim 1 , wherein the network node is an anchor node.

4. The method of claim 1, further comprising: The access SI configuration is transmitted to the one or more devices, wherein the access SI configuration further indicates an access control resource set CORESET.

5. The method of claim 4, wherein the access SI configuration further indicates one or both of a search space and a control resource set (CORESET) for SI grant.

6. The method of claim 5, further comprising: A physical downlink control channel (PDCCH) conveying the SI grant is transmitted based at least in part on the access SI configuration, wherein the SI grant schedules an SI message via a physical downlink shared channel (PDSCH).

7. An apparatus for wireless communication, comprising: processor, a memory in communication with the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: Receiving, at a relay device in a wireless network, an access system information (SI) configuration and a backhaul SI configuration from a network node in the wireless network; determining an access SI for one or more devices in the wireless network to access a cell supported by the relay device based at least in part on the access SI configuration indicating an access search space to be monitored for an access specific SI-Radio Network Temporary Identifier (SI-RNTI), wherein the access SI is different from a backhaul SI used for communication with the network node or another network node in the wireless network, and wherein the access search space is different from a backhaul search space indicated by the backhaul SI configuration; as well as A transmitter is configured to transmit a synchronization signal SS indicating the access SI to the one or more devices.

8. The apparatus of claim 7, wherein at least one of the relay device and the network node is an Integrated Access Backhaul (IAB) node.

9. The apparatus of claim 7, wherein the network node is an anchor node.

10. The apparatus of claim 7, wherein the transmitter is further configured to transmit the access SI configuration to the one or more devices, and wherein the access SI configuration further indicates an access control resource set (CORESET).

11. The apparatus of claim 10, wherein the access SI configuration further indicates one or both of a search space and a control resource set (CORESET) for SI grant.

12. The apparatus of claim 11, wherein the transmitter is further configured to transmit a physical downlink control channel (PDCCH) conveying the SI grant based at least in part on the access SI configuration, wherein the SI grant schedules an SI message via a physical downlink shared channel (PDSCH).

13. An apparatus for wireless communication, comprising: Means for receiving, at a relay device in a wireless network, an access system information (SI) configuration and a backhaul SI configuration from a network node in the wireless network; means for determining an access SI for one or more devices in the wireless network to access a cell supported by the relay device based at least in part on the access SI configuration indicating an access search space to be monitored for an access specific SI-Radio Network Temporary Identifier (SI-RNTI), wherein the access SI is different from a backhaul SI used for communication with the network node or another network node in the wireless network, and wherein the access search space is different from a backhaul search space indicated by the backhaul SI configuration; and means for transmitting a synchronization signal SS indicating said access SI to said one or more devices.

14. The apparatus of claim 13, wherein at least one of the relay device and the network node is an Integrated Access Backhaul (IAB) node.

15. The apparatus of claim 13, wherein the network node is an anchor node.

16. The apparatus of claim 13, further comprising: means for transmitting the access SI configuration to the one or more devices, wherein the access SI configuration further indicates an access control resource set CORESET.

17. The apparatus of claim 16, wherein the access SI configuration further indicates one or both of a search space and a control resource set (CORESET) for SI grant.

18. The apparatus of claim 17, further comprising: Means for transmitting a physical downlink control channel (PDCCH) conveying the SI grant based at least in part on the access SI configuration, wherein the SI grant schedules an SI message via a physical downlink shared channel (PDSCH).

19. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: Receiving, at a relay device in a wireless network, an access system information (SI) configuration and a backhaul SI configuration from a network node in the wireless network; determining an access SI for one or more devices in the wireless network to access a cell supported by the relay device based at least in part on the access SI configuration indicating an access search space to be monitored for an access specific SI-Radio Network Temporary Identifier (SI-RNTI), wherein the access SI is different from a backhaul SI used for communication with the network node or another network node in the wireless network, and wherein the access search space is different from a backhaul search space indicated by the backhaul SI configuration; and A synchronization signal SS indicating the access SI is transmitted to the one or more devices.

20. The non-transitory computer-readable medium of claim 19, wherein at least one of the relay device and the network node is an Integrated Access Backhaul (IAB) node.

21. The non-transitory computer-readable medium of claim 19, wherein the network node is an anchor node.

22. The non-transitory computer readable medium of claim 19, the code further comprising instructions executable by the processor to: The access SI configuration is transmitted to the one or more devices, wherein the access SI configuration further indicates an access control resource set CORESET.

23. The non-transitory computer-readable medium of claim 22, wherein the access SI configuration further indicates one or both of a search space and a control resource set (CORESET) for SI grant.

24. The non-transitory computer readable medium of claim 23, the code further comprising instructions executable by the processor to: A physical downlink control channel (PDCCH) conveying the SI grant is transmitted based at least in part on the access SI configuration, wherein the SI grant schedules an SI message via a physical downlink shared channel (PDSCH).

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