On-demand SIB1 transmission request

Abstract

Various aspects of the present disclosure relate to on-demand system information block 1 (SIB1) transmission request. An apparatus, such as a user equipment (UE), receives, from a network equipment (NE), a response message to a preamble transmission, where the response message includes an allocation of uplink resources. The UE transmits, to the NE, a request for one or more system information block 1 (SIB1) transmissions, and the UE receives, from the NE, an acknowledgement of the request for the one or more SIB1 transmissions.

Description

ON-DEMAND SIB1 TRANSMISSION REQUESTRELATED APPLICATION

[0001] This application claims priority to U.S. Provisional Application Serial No. 63 / 574,218 filed April 03, 2024 entitled “On-Demand SIB1 Transmission Request,” the disclosure of which is incorporated by reference herein in its entirety.TECHNICAL FIELD

[0002] The present disclosure relates to wireless communications, and more specifically to user equipment (UE) and network equipment (NE) signaling.BACKGROUND

[0003] A wireless communications system may include one or multiple network communication devices, which may be otherwise known as network equipment (NE), supporting wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE), or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like)). Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G)).

[0004] The wireless communications system may support wireless communications, and may include one or more devices, such as UEs, base stations, network entities, satellites, and / or network equipment (NE), among other devices, that transmit and / or receive signaling. The wireless communications signaling between UEs and NEs (e.g., base stations, gNBs) may be considered for overall network energy savings.SUMMARY

[0005] An article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a,” “at least one,” “one or more,” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of’ or “one or more of’ or “one or both of’) indicates an inclusive list such 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). Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.” Further, as used herein, including in the claims, a “set” may include one or more elements.

[0006] A UE for wireless communication is described. The UE may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the UE may be configured to, capable of, or operable to receive, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources. The UE transmits, to the NE, a request for one or more system information block 1 (SIB1) transmissions, and the UE receives, from the NE, an acknowledgement of the request for the one or more SIB 1 transmissions.

[0007] A processor (e.g., a standalone processor chipset, or a component of a UE) for wireless communication is described. The processor may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the processor may be configured to, capable of, or operable to receive, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources; transmit, to the NE, a request for one or more SIB1 transmissions; and receive, from the NE, an acknowledgement of the request for the one or more SIB1 transmissions.

[0008] A method performed or performable by a UE for wireless communication is described. The method may include receiving, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources; transmitting, to the NE, a request forone or more SIB1 transmissions; and receiving, from the NE, an acknowledgement of the request for the one or more SIB1 transmissions.

[0009] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may be configured to, capable of, or operable to transmit, to the NE, the preamble transmission. In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may be configured to, capable of, or operable to transmit the request for the one or more SIB 1 transmissions based on the response message received from the NE. In some implementations of the UE, the processor, and the method described herein, the request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB 1 transmissions.

[0010] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may be configured to, capable of, or operable to monitor for a feedback response from the NE over a predetermined time duration, the feedback response including the acknowledgement of the request for the one or more SIB 1 transmissions. In some implementations of the UE, the processor, and the method described herein, the feedback response is included in a contention resolution message that includes an indication of reception of the one or more SIB 1 transmissions as requested. In some implementations of the UE, the processor, and the method described herein, the feedback response included in the contention resolution message is a medium access control (MAC) control element (CE). In some implementations of the UE, the processor, and the method described herein, the MAC CE is a contention resolution identity transmitted in a message 4 (Msg4) of a random access channel (RACH) procedure.

[0011] In some implementations of the UE, the processor, and the method described herein, the request for the one or more SIB1 transmissions is transmitted in a message 3 (Msg3) of a RACH procedure. In some implementations of the UE, the processor, and the method described herein, the request for the one or more SIB 1 transmissions comprises a bitmap indicating the request for the one or more SIB 1 transmissions. In some implementations of the UE, the processor, and the method described herein, the bitmap indicates a SIB 1 request for one or more cells, and the bitmap is transmitted in a message 3 (Msg3) of a RACH procedure. In some implementations of the UE, the processor, and the method described herein, a feedback response is included in a contention resolution message that comprises a second bitmap that matches the bitmap transmitted in the Msg3to request the one or more SIB1 transmissions. In some implementations of the UE, the processor, and the method described herein, the request for the one or more SIB 1 transmissions is transmitted in a radio resource control (RRC) message.

[0012] An NE for wireless communication is described. The NE may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the NE may be configured to, capable of, or operable to transmit, to a UE, a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources. The NE receives, from the UE, a request for one or more SIB1 transmissions, and the NE transmits, to the UE, an acknowledgement of the request for the one or more SIB1 transmissions.

[0013] A processor (e.g., a standalone processor chipset, or a component of a NE) for wireless communication is described. The processor may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the processor may be configured to, capable of, or operable to transmit, to a UE, a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources; receive, from the UE, a request for one or more SIB1 transmissions; and transmit, to the UE, an acknowledgement of the request for the one or more SIB1 transmissions.

[0014] A method performed or performable by an NE (e.g., a base station) for wireless communication is described. The method may include transmitting, to a UE, a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources; receiving, from the UE, a request for one or more SIB1 transmissions; and transmitting, to the UE, an acknowledgement of the request for the one or more SIB 1 transmissions.

[0015] In some implementations of the NE, the processor, and the method described herein, the NE, the processor, and the method may be configured to, capable of, or operable to receive, from the UE, the preamble transmission. In some implementations of the NE, the processor, and the method described herein, the request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB 1 transmissions. In some implementations of the NE, the processor, and the method described herein, the NE, the processor, and the method may be configured to, capable of, or operable to transmit the acknowledgement ofthe request for the one or more SIB 1 transmissions as a feedback response to the UE during a predetermined time duration.

[0016] In some implementations of the NE, the processor, and the method described herein, the feedback response is included in a contention resolution message, and the feedback response is a MAC CE. In some implementations of the NE, the processor, and the method described herein, the MAC CE is a contention resolution identity received in a Msg4 of a RACH procedure. In some implementations of the NE, the processor, and the method described herein, the request for the one or more SIB 1 transmissions is received in a Msg3 of a RACH procedure. In some implementations of the NE, the processor, and the method described herein, the request for the one or more SIB1 transmissions comprises a bitmap indicating the request for the one or more SIB 1 transmissions. In some implementations of the NE, the processor, and the method described herein, the bitmap indicates a SIB 1 request for one or more cells, and the bitmap is received in a Msg3 of a RACH procedure. In some implementations of the NE, the processor, and the method described herein, the request for the one or more SIB 1 transmissions is received in a RRC message.BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.

[0018] Figure 2 illustrates an example signaling diagram and procedures for 5G random access channel (RACH), in accordance with aspects of the present disclosure.

[0019] Figure 3 illustrates an example signaling diagram for master information block (MIB) and system information block (SIB) signaling between a UE and NE, in accordance with aspects of the present disclosure.

[0020] Figures 4a-c illustrate an example of SIB 1 message configuration information, in accordance with aspects of the present disclosure.

[0021] Figure 5 illustrates an example of a request message in accordance with aspects of the present disclosure.

[0022] Figure 6 illustrates another example of a request message in accordance with aspects of the present disclosure.

[0023] Figure 7 illustrates an example of a UE in accordance with aspects of the present disclosure.

[0024] Figure 8 illustrates an example of a processor in accordance with aspects of the present disclosure.

[0025] Figure 9 illustrates an example of a network equipment (NE) in accordance with aspects of the present disclosure.

[0026] Figure 10 illustrates a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.

[0027] Figure 11 illustrates a flowchart of a method performed by an NE in accordance with aspects of the present disclosure.DETAIEED DESCRIPTION

[0028] A wireless communications system may support wireless communications for one or more devices, such as UEs, base stations, network entities, satellites, and / or other devices, supporting wireless communications (e.g., control information, data, packets, etc.). The wireless communications system may consume substantial power or energy as a result of the various signaling aspects associated with the wireless communications between the various devices (e.g., UEs, base stations, network entities, satellites, and / or other devices). For example, one or more of the base stations or the network entities may consume power or energy to transmit one or more synchronization signal blocks (SSBs), including physical broadcast channel (PBCH) for MIB and system information block 1 (SIB1) transmissions.

[0029] The power or energy consumption by the various devices (e.g., UEs, base stations, network entities, satellites, and / or other devices) may be adversely impacting the environment and the climate. Additionally, the power or energy consumption by the various devices (e.g., UEs, base stations, network entities, satellites, and / or other devices) may result in high operating expenses for consumers and operators associated with the wireless communications system. The continued expansion of data traffic, combined with the rising costs of spectrum, capital investment, and ongoing radio access network (RAN) maintenance and upgrades, necessitates energy-saving measures in network operations. The 5G New Radio (NR) offers significant energy-efficiencyimprovements per gigabyte over previous generations of data mobility. However, new 5G use cases and the adoption of mmWave may likely require additional RAN sites and antennas. This prospect could lead to the development of a more efficient network, but may also result in higher emissions and increased operating expenses. As 5G and radio access technologies beyond 5G become more prevalent across industries and geographical areas, the demand for advanced services and applications with higher data rates grow. Accordingly, networks may have to utilize more antennas, larger bandwidths, and a greater number of frequency bands compared to other radio access technologies (e.g., 4G).

[0030] Aspects of the disclosure are directed to techniques for managing on-demand transmission of one or more SSBs or SIB Is. By enabling one or more network entities to transmit, and one or more UEs, to receive on-demand SSBs or SIB Is, the one or more network entities or UEs may experience power saving, as well as the one or more network entities may experience reduced network traffic. For example, a serving cell may not broadcast SIB1 for network energy savings, and instead, a UE can explicitly request the transmission of the SIB 1. Accordingly, the present disclosure provides techniques for a UE to request the SIB 1 for one or multiple cells. In some implementations, a SIB 1 request message can be transmitted in a random access message, such as Msg3 of a RACH procedure, which provides sufficient overhead for requesting the transmission of SIB 1 from multiple neighboring cells.

[0031] In one or more implementations, a UE can request, within a RACH Msg3, the transmission of SIB 1 message(s) which are not broadcast in the corresponding cells. A new SIB 1 transmission request message can be either signaled using a new MAC CE or a new RRC message within the RACH Msg3. A RACH Msg4 can be used to acknowledge the reception of the SIB1 request message. In another implementation, a UE can indicate a SIB 1 transmission request by a combination of a physical random access channel (PRACH) transmission and a Msg3 transmission. A set of PRACH preambles and / or PRACH resources can be configured for the SIB 1 request, and a RACH Msg3 carries the detailed SIB1 transmission request information (e.g., a list of cell IDs or a bitmap).

[0032] Aspects of the present disclosure are described in the context of a wireless communications system. In the wireless communications system, a UE and an NE (e.g., a base station, gNB, network entity, network node) may support wireless communication, includingreception and / or transmission of wireless communication using time-frequency resources. For example, the UE and the NE may support communicating signals (e.g., carrying control information, data, or the like). It should be understood that various terms may be used interchangeably with “communicating,” such as “signaling,” “transmitting,” “receiving,” “outputting,” “forwarding,” “relaying,” “retrieving,” “obtaining,” and so forth.

[0033] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more NE 102, one or more UE 104, and a core network (CN) 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE- Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA), etc.

[0034] The one or more NE 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NE 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a network node, network infrastructure, a radio access network (RAN), a NodeB, an eNodeB (eNB), a next-generation NodeB (gNB), or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.

[0035] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video,packet data, messaging, broadcast, etc.) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN). In some implementations, different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NE 102.

[0036] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (loT) device, an Internet-of- Everything (loE) device, or machine-type communication (MTC) device, among other examples.

[0037] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.

[0038] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., SI, N2, N6, or other network interface). In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other indirectly (e.g., via the CN 106). In some implementations, one or more NE 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC). An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs).

[0039] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolvedpacket core (EPC), or a 5G core (5GC), which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management functions (AMF)) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc.) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.

[0040] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an SI, N2, N6, or other network interface). The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session). The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106).

[0041] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communications). In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures). The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.

[0042] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., / r=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., / r=0) associated with thefirst subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., / r=l) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., / r=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., / r=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., / r=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.

[0043] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames). Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.

[0044] Additionally, or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., / r=0, / =l , / r=2, / r=3, / r=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols). In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing), a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., / r=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.

[0045] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels,etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz - 7.125 GHz), FR2 (24.25 GHz - 52.6 GHz), FR3 (7.125 GHz - 24.25 GHz), FR4 (52.6 GHz - 114.25 GHz), FR4a or FR4-1 (52.6 GHz - 71 GHz), and FR5 (114.25 GHz - 300 GHz). In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data). In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.

[0046] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies). For example, FR1 may be associated with a first numerology (e.g., / r=0), which includes 15 kHz subcarrier spacing; a second numerology (e.g., / r=l), which includes 30 kHz subcarrier spacing; and a third numerology (e.g., / r=2), which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies). For example, FR2 may be associated with a third numerology (e.g., / r=2), which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., / r=3), which includes 120 kHz subcarrier spacing.

[0047] According to implementations, one or more of the NEs 102 and the UEs 104 are operable to implement various aspects of the techniques described with reference to the present disclosure. For example, a UE 104 receives from an NE 102, a response message to a preamble transmission, where the response message includes an allocation of uplink resources. The UE 104 transmits, to the NE 102, a request for one or more SIB1 transmissions, and the UE 104 receives, from the NE 102, an acknowledgement of the request for the one or more SIB1 transmissions. Additionally, an NE 102 transmits, to a UE 104, a response message to a preamble transmission received from the UE, where the response message includes an allocation of uplink resources. The NE 102 receives, from the UE 104, a request for one or more SIB1 transmissions, and the NE 102 transmits, to the UE 104, an acknowledgement of the request for the one or more SIB1 transmissions.

[0048] With reference to network energy savings, emissions and energy consumption by the many various network devices and entities in a wireless communications system may be adverselycontributing to the climate, not to mention the extensive operating expenses to run telecommunication devices and services. The continued expansion of data traffic, combined with the rising costs of spectrum, capital investment, and ongoing radio access network (RAN) maintenance and upgrades, necessitates energy-saving measures in network operations. The 5G New Radio (NR) offers significant energy-efficiency improvements per gigabyte over previous generations of data mobility. However, new 5G use cases and the adoption of mmWave may likely require additional RAN sites and antennas. This prospect could lead to the development of a more efficient network, but may also result in higher emissions and increased operating expenses. As 5G and radio access technologies beyond 5G become more prevalent across industries and geographical areas, the demand for advanced services and applications with higher data rates grow. Accordingly, networks may have to utilize more antennas, larger bandwidths, and a greater number of frequency bands compared to other radio access technologies (e.g., 4G).

[0049] A wireless communications system may support wireless communications for one or more devices, such as UEs, base stations, network entities, satellites, and / or other devices, supporting wireless communications (e.g., control information, data, packets, etc.). The wireless communications system may consume substantial power or energy as a result of the various signaling aspects associated with the wireless communications between the various devices (e.g., UEs, base stations, network entities, satellites, and / or other devices). For example, one or more of the base stations or the network entities may consume power or energy to transmit one or more synchronization signal blocks (SSBs), including physical broadcast channel (PBCH) for MIB and system information block 1 (SIB1) transmissions. An energy saving option is to not provide these types of transmissions, but rather use an anchor cell as a proxy (for time-frequency synchronization and SIB1). Procedures and signaling methods support on-demand synchronization signal block (SSB) secondary cell (SCell) operation for UEs in a connected mode, as well as to implement triggering techniques, such as using a UE uplink wake-up-signal on an existing signal or channel, a cell on / off indication via backhaul, and / or SCell activation and deactivation signaling.

[0050] In a conventional solution, a UE would indicate a SIB transmission request by means of transmitting a reserved or configured preamble. However, a preamble transmission only indicates the SIB 1 request for a cell as the preamble, and the amount of information conveyed by a PRACH preamble is limited. Hence, the UE would need to perform the SIB 1 request procedure multipletimes when requesting the SIB 1 for a plurality of cells. The described techniques provide for requesting the SIB1 transmission for multiple cells at once. Further, aspects of the disclosure are directed to providing the SSBs and SIB 1 transmissions on an on-demand basis, such as when requested, which reduces network traffic and saves energy. For example, a serving cell may not broadcast SIB1 for network energy savings, and instead, a UE can explicitly request (e.g., on- demand) the transmission of the SIB1. Accordingly, the present disclosure provides techniques for a UE to request the SIB 1 for one or multiple cells. In some implementations, a SIB 1 request message can be transmitted in a random access message, such as Msg3 of a RACH procedure, which provides sufficient overhead for requesting the transmission of SIB 1 from multiple neighboring cells.

[0051] Energy consumption is a key part of network operating expenses, accounting for approximately one-quarter of the total operator cost. Most of the energy consumption comes from the radio access network and in particular, from the active antenna unit (AAU), with data centers and fiber transport accounting for a smaller share. The power consumption of a radio access can be split into two parts, namely a dynamic part which is only consumed when data transmission and reception is ongoing, and a static part during which power is consumed all of the time to maintain the necessary operation of the radio access devices, even when the data transmission and reception is not on-going.

[0052] There is a need for network energy savings and improved consumption model, particularly for base station (BS), key performance indicators (KPIs), and network energy savings techniques in targeted deployment scenarios. More efficient operations can be achieved dynamically and / or semi-statically, and a finer granularity adaptation of transmissions and / or receptions in one or more of network energy saving techniques in time, frequency, spatial, and power domains, with potential support and / or feedback from UE, potential UE assistance information, and information exchange and coordination over network interfaces. The potential network energy consumption gains can be evaluated so as to balance the impact on network and user performance, by looking at KPIs, such as spectral efficiency, capacity, user perceived throughput (UPT), latency, UE power consumption, complexity, handover performance, call drop rate, initial access performance, service level agreement (SLA) assurance related KPIs, etc.

[0053] Figure 2 illustrates an example signaling diagram 200 and procedures for 5G RACH, in accordance with aspects of the present disclosure. With reference to RACH in 5G, there are several different types of RACH processes and different use cases where each of those different procedures are used. For example, for RACH for NSA setup, short preamble [A]+[C]+[D] would be applicable. For contention based RACH in SAR, short preamble [ A]+[B]+[C]+[D] would be applicable.

[0054] In this example signaling diagram, and for a Msgl 202 (preamble transmission), the UE 104 selects a random access preamble from a set of predefined preambles. In implementations, these preambles can be of two categories, short preamble format and long preamble format. The UE also selects a random sequence number for the preamble. After selecting the preamble and sequence number, the UE transmits the preamble on the PRACH. For a Msg2 204 (random access response), and upon receiving Msgl, the gNB 102 (e.g., a BS) sends a response as Msg2. The Msg2 consists of several critical pieces of information, such as the time advance (TA) command for uplink timing adjustment, the random access preamble identifier (RAPID) matching the preamble sent by the UE, and an initial uplink grant for the UE. The gNB also assigns a temporary identifier called temporary cell radio network temporary identifier (TC-RNTI) to the UE.

[0055] For a Msg3 206, and using the initial uplink grant provided in Msg2, the UE 104 transmits the Msg3 on the physical uplink shared channel (PUSCH), which may carry a RRC message (e.g., RrcRequest), other data (e.g., MAC control element (MAC CE)), or user data. For a Msg4 208 (contention resolution), and after processing Msg3, the gNB 102 transmits the Msg4 to the UE. The Msg4 is comprised of a MAC CE which is for contention resolution. The contention resolution message contains the UE identity, confirming that the gNB has correctly identified the UE, and contention has been resolved.

[0056] Figure 3 illustrates an example signaling diagram 300 for MIB and SIB signaling between a UE and NE, in accordance with aspects of the present disclosure. In this example, the MIB 302 is transmitted over the broadcast channel (BCH) or PBCH (e.g., PBCH is transmitted as a part of SSB), and is transmitted with the periodicity of 80 ms (repetitive transmission occurs within this 80 ms). For initial cell selection, a UE 104 may assume that half frames with synchronization signal / physical broadcast channel (SS / PBCH) blocks occur with a periodicity of 2 frames. The MIB includes the parameters that are required to decode SIB 1.

[0057] The MIB —SEQUENCE { systemFrameNumber BIT STRING (SIZE (6)), subCarrierSpacingCommon ENUMERATED {scs!5or60, scs30orl20{, ssb-SubcarrierOffset INTEGER (0..15), dmrs-TypeA-Position ENUMERATED {pos2, pos3{, pdcch-ConfigSIB 1 INTEGER (0..255), cellBarred ENUMERATED {barred, notBarred}, intraFreqReselection ENUMERATED {allowed, notAllowed}, spare BIT STRING (SIZE (l))

[0058] In this example, the subCarrierSpacingCommon indicates the subcarrier spacing for SIB1, Msg.2 / 4 for initial access and system information (Sl)-messages. Interpretation of this value varies with the frequency range, such as for FR1: scsl5or60 is 15 Khz, and scs30orl20 is 30 Khz; and for FR2: scsl5or60 is 60 Khz, and scs30orl20 is 120 Khz. The ssb-SubcarrierOffset corresponds to k_ssb, which indicates the frequency domain offset between SSB and the overall resource block grid in number of subcarriers. If k_ssb requires the value higher than 15, it is represented by the combination of a PBCH data field and ssb-subcarrierOffset. The dmrs-TypeA- Position indicates a position of a first downlink (DL) demodulation reference signal (DM-RS). The pdcch-ConfigSIB 1 indicates a bandwidth for physical downlink control channel (PDCCH) SIB, a common control resource set (CORESET), and a common search space and necessary PDCCH parameters. This corresponds to remaining minimum system information (RMSI)-PDCCH-Config.

[0059] In this example, the SIB1 304 (SystemlnformationBlockTypel) is transmitted over downlink shared channel (DL-SCH) (SIB1 is the first RRC message, except MIB). The UE 104 needs to be able to decode SIB1 without much information from an over-the-air (OTA) signaling message. Therefore, 3GPP defines a specific procedure to transmit and decode downlink control information (DCI) and physical downlink shared channel (PDSCH) for SIB 1. The SIB 1 is transmitted with the periodicity of 160 ms (repetitive transmission occurs within this 160 ms). The SIB 1 includes information regarding the availability and scheduling (e.g. periodicity, SI- window size) of other SIB, and the SIB1 indicates whether the other SIBs are provided via a periodic broadcast basis or only on-demand basis. If other SIBs than SIB1 are provided on-demand, the SIB1 includes information for the UE to perform a SI request.

[0060] Figures 4a-c illustrate an example of SIB 1 message configuration information 400 in accordance with aspects of the present disclosure. In this example, SIB 1 contains information relevant when evaluating if a UE is allowed to access a cell and defines the scheduling of other system information. It also contains RRC information that is common for all UEs and barring information applied to the unified access control. The signaling radio bearer is N / A; the radio link control-service access point (RLC-SAP) is transparent mode (TM); the logical channels are broadcast control channel (BCCH); and the direction is network to UE. The SIB1 field descriptions are indicated in the table below.

[0061] In aspects of the present disclosure, a UE indicates a SIB 1 transmission request by a PRACH (preamble transmission, Msgl). The Msgl can be any preamble (the occasion may still need to be predetermined). A gNB replies with RACH Msg2 including Msg3 resource scheduling. The Msg3 (reply to Msg2) transmitted by the UE indicates whether the RACH procedure is for legacy RACH purposes or for requesting SIB 1 transmission. The Msg3 includes an RRC message (e.g., instead of RrcSetupRequest) or adds a new Establishmentcause representing SIBlRequest. The Msg3 may include one or more target cell IDs for which SIB1 is requested. If the Msg3 indicates an on-demand SIB 1 transmission request, the gNB replies with Msg4 as an acknowledgement of the SIB 1 request. The Msg4 is scheduled by DCI scrambled with RNTI given in Msg2 (which may be a TC-RNTI or a fixed or reserved RNTI, such as SI-RNTI / SIB 1-RNTI), and the UE doesn’t acquire C-RNTI from Msg2 / Msg4. If the Msg3 indicates an on-demand SIB1transmission request, the gNB replies with a Msg4 carrying the SIB 1 content for the requested cells. The Msg4 is scheduled by DCI scrambled with RNTI given in Msg2 (which may be a TC-RNTI or a fixed or reserved RNTI, such as SI-RNTI / SIB1-RNTI), and the UE doesn’t acquire C-RNTI from Msg2 / Msg4.

[0062] In further aspects of the present disclosure, the UE requests SIB 1 transmission by transmitting a PRACH preamble (Msgl). The gNB replies with a RACH Msg2 including Msg3 resource scheduling. The Msgl can be any preamble (the occasion may still need to be predetermined). The Msg3 (reply to Msg2) transmitted by the UE indicates whether the RACH procedure is for legacy RACH purposes or for requesting SIB1 transmission. The Msg3 includes a new RRC message SIB 1 Request, and the Msg3 may include one or more target cell IDs for which SIB1 is requested (e.g., a bitmap where each bit represents a cell). If the Msg3 indicates an on- demand SIB1 transmission request (e.g. contains SIBlRequest), the gNB replies with Msg4 as acknowledgement of the SIB 1 request. The Msg4 is scheduled by DCI scrambled with RNTI given in Msg2 (instead of TC-RNTI), and the UE doesn’t acquire C-RNTI from Msg2 / Msg4. If the Msg3 indicates an on-demand SIB1 transmission request (e.g., contains SIBlRequest), the gNB replies with Msg4 carrying the SIB1 content for the requested cell(s). The Msg4 is scheduled by DCI scrambled with RNTI given in Msg2 (instead of TC-RNTI), and the UE doesn’t acquire C-RNTI from Msg2 / Msg4.

[0063] If the Msg l is a specific preamble associated with requesting a SIB 1 transmission request, then the Msg2 serves as acknowledgement of the SIB 1 transmission request and includes Msg3 resource scheduling. Optionally, Msg2 includes a reserved RNTI (such as existing SI-RNTI or new SIB 1 -RNTI) in the random access response (instead of the TC-RNTI). As an alternative option, the RACH response (RAR) contains no RNTI for the SIB 1 request procedure. The Msg3 includes a new RRC message or a new MAC CE SIBlRequest. The SIBlRequest represents one or more target cell IDs for which SIB1 is requested (e.g., a bitmap where each bit represents a cell, or one or more cell IDs). The gNB replies with Msg4 indicating the corresponding SIB1 request field. This serves as contention resolution (i.e., the UE can know from Msg4 which cells the gNB has detected the SIB 1 request. The Msg4 is scheduled by DCI scrambled with RNTI given in Msg2 (may be a TC-RNTI or a fixed / reserved RNTI, such as SI-RNTI / SIB1-RNTI), and the UE doesn’t acquire C-RNTI from Msg2 / Msg4.

[0064] In aspects of the described techniques, a UE requests within the RACH message 3 (or MsgA-PUSCH transmission for the case of a 2-step RACH procedure) the transmission of SIB1 message(s) which are not broadcast in the corresponding cell(s). According to an implementation, RRC triggers the transmission of the SIB 1 request procedure based on a (pre)defined trigger condition. The RRC indicates to the MAC layer to initiate a RACH procedure for the purpose of SIB 1 request and acquisition. In response to the reception of the indication from the RRC layer, the MAC layer initiates a contention-based random access procedure. In an example, the UE / MAC selects a PRACH preamble from a set of configured (contention-based) PRACH preambles and determines a PRACH resource, and performs the random access preamble transmission on the selected or determined PRACH resource. In an example, the RACH resource is selected based on information broadcast in an anchor cell (e.g., for the scenario where the UE requests a SIB1 transmission from a neighboring cell). In another example, the RACH resources and / or preambles are fixed in the specification. In another example, the PRACH configuration for a SIB 1 request is determined based on a function of information in MIB, PBCH, and / or SSB.

[0065] In response to the transmission of the PRACH preamble, the UE monitors for a random access response message during the random access response window. Upon successful reception of the RAR message (e.g., if the random access response contains a MAC sub-PDU with a random access preamble identifier corresponding to the transmitted PREAMBLE _INDEX, UE / MAC), the UE generates the SIB1 transmission request message.

[0066] In one or more implementations, a UE includes a MAC CE within the RACH message 3 (or MsgA-PUSCH transmission of Msg A when performing a 2-step RACH procedure) which conveys the SIB1 request information (e.g., a SIB1 transmission request message is conveyed via a new MAC CE). This MAC CE contains a bitmap indicating the cells for which the UE requests the transmission of SIB 1. The bitmap has an entry for each of the cells the UE can request the transmission of SIB1. In one example, the size of the bitmap is set to the maximum supported number of (neighboring) cells. In another example, the bitmap is of variable size, and each bit of the bitmap corresponds to a cell the UE can request the transmission of SIB1. The UE indicates (e.g., by setting the corresponding field or bit of the bitmap to a predefined value, e.g., 1) whether the SIB 1 transmission is requested for the corresponding cell.

[0067] According to an implementation, the MAC CE contains at least one identifier identifying the cell for which the transmission of a SIB 1 is requested. In an example, the MAC CE is of variable size indicating the list of IDs (e.g., cell IDs) for which a SIB1 transmission is requested. In an example, the cell ID is a physical cell ID or a truncated version of the physical cell ID (PCI) (e.g., x LSB of the PCI). The SIB1 request MAC CE is identified by a MAC sub-header with a reserved logical channel ID (LCID). In an implementation, the SIB 1 request MAC CE has a fixed size of zero bits. For cases where the UE requests the SIB1 transmission only for the cell on which the random access procedure is performed (e.g., no SIB1 request for neighboring cells), the SIB1 request MAC CE has no content (e.g., only the LCID or MAC sub-header indicates the SIB1 request to the gNB).

[0068] Figure 5 illustrates an example of a RRCSetupRequest message 500 in accordance with aspects of the present disclosure. In one or more implementations, the SIB 1 transmission request message is transmitted within a RRC message signaled within RACH Msg3 or a MsgA-PUSCH. According to an implementation, the SIB 1 transmission request is conveyed via the RRCSetupRequest message, where the Establishmentcause is set to a new value indicating a SIB 1 transmission request. According to the current specified RRCSetupRequest message, there are several spare values for the Establishmentcause as shown in this example RRCSetupRequest message 500. According to an implementation, one of the spare values is reused to indicate the SIB 1 transmission request. For cases that a UE requests the SIB 1 transmission only for the cell on which the random access procedure is performed (e.g., no SIB1 request for neighoring cells), one spare value is sufficient to indicate the SIB1 transmission request. In an example, multiple spare values of the Establishmentcause field may be used to indicate a SIB 1 transmission request also for a neighboring cell.

[0069] Additionally, a RACH Msg3 or MsgA-PUSCH is (at least) comprised of a new RRC message which contains the SIB1 transmission request message. According to an implementation, the SIB 1 transmission request message is conveyed via a new RRC message which is signaled within RACH Msg3. In an example, the RRC message is comprised of a list of identifiers identifying the cells for which a SIB 1 transmission is requested. According to another implementation, the RRC message is comprised of a bitmap, where each field of the bitmap corresponds to a cell for which the UE may request a SIB1 transmission. The UE indicates (e.g., bysetting the corresponding field or bit of the bitmap to a predefined value, e.g., 1), whether SIB1 transmission is requested for the corresponding cell.

[0070] Figure 6 illustrates an example of an uplink (UL)-CCHl -Message 600 in accordance with aspects of the present disclosure. In this example, a new RRC message used to request one or more SIB1 transmissions is transmitted on the common control channel (CCCH) (e.g., new UL- CCCH-MessageType). In an implementation, the new RRC message (e.g., a SIB 1 -request message) is transmitted on the uplink CCCH1 logical channel. There are (according to the current specifications) some spare values for the UL-CCH 1 -MessageType as shown in this example UL-CCH1 -Message 600. According to an example, one of the spare values is (re)used to introduce a new UL-CCCH1 -MessageType (e.g., a SIB1 request), which is used to request the SIB1 transmission for one or multiple cells. In an implementation, the new RRC message (e.g., a SIB1 request message) is identified by a new reserved logical channel ID (e.g., a new LCID identifies a CCCH used for a SIB 1 request message).

[0071] In one or more implementations, a gNB transmits in a RACH Msg4 or MsgB, as a contention resolution MAC CE, the SIB1 request message that it received in Msg3. This enables a UE to identify whether its SIB1 request information was correctly received by the gNB. Upon reception of the RACH Msg4, the UE can determine by decoding the contention resolution MAC CE, whether the requested SIB1 transmissions are acknowledged (i.e., the received UE contention resolution identity is matching the bitmap or list of cell ID(s) transmitted within the SIB 1 request MAC CE or SIB 1 request RRC message). If the UE contention resolution identity in the MAC CE matches the CCCH service data unit (SDU) or MAC CE transmitted in Msg3, then the UE considers the contention resolution as successful and indicates the reception of an acknowledgment for the SIB 1 request to the upper layer (RRC). If the contention resolution is not successful, the UE may trigger the SIB1 transmission request procedure again (i.e., by sending a PRACH preamble for a SIB 1 request).

[0072] According to an implementation, the RNTI used for a RACH Msg4 transmission which serves as an acknowledgment for the SIB1 transmission request is matching the RNTI signaled within the RAR (e.g., the RACH Msg2 or MsgB-RAR). In the legacy 4-step RACH procedure, the temporary C-RNTI (TC-RNTI) is used for RACH Msg4. For the 2-step RACH procedure, a MsgB is addressed to the MsgB -RNTI. In an example, the random access response message may include adifferent RNTI than the TC-RNTI (e.g., SIB1-RNTI, SI-RNTI). According to an implementation, the RNTI used for a RACH Msg4 is a common predefined RNTI value. In this example, a predefined or fixed common RNTI is used, which is specific for the SIB 1 request procedure.

[0073] In an example, the corresponding RACH message 4 is comprised of a bitmap or list of cell ID(s), which denote the SIBl(s) for which a gNB has received a request. Since a common RNTI is used, it is not only addressed to a single UE, but to all UEs that sent a SIB 1 request. Each UE that has sent a SIB1 request can determine, based on the RACH Msg4 content, whether their SIB1 request was successfully received by the gNB. The contention resolution is considered as successful and hence the reception of an acknowledgement for the SIB1 request procedure is indicated to the upper layer if the UE finds the cell ID(s) or the corresponding bits or fields within the bitmap set to the predefined value (e.g., 1) in the RACH Msg4 for which it has sent a SIB 1 transmission request. Even UEs that have not sent a SIB 1 request can receive this message and check the requested SIBl(s) so that they may not need to request SIBl(s) which have already been requested by other UEs.

[0074] According to an implementation, a gNB may transmit (at least part of) the requested SIB 1 messages in the RACH Msg4. The contention resolution MAC CE may or may not be included in the RACH Msg4. In an example the RACH Msg4 may include an info field indicating that the requested SIB 1 message(s) are delivered in a unicast fashion to the UE (instead of broadcasting the SIB 1 message(s) in the corresponding cells).

[0075] In one or more implementations, a UE indicates a SIB 1 transmission request by a combination of a PRACH transmission and a Msg3 transmission. According to an implementation, a set of PRACH preambles and / or PRACH resources are configured for a SIB 1 request. When the SIB 1 request procedure is triggered by an upper layer (RRC layer), the UE selects a preamble and / or PRACH resource which is configured for SIB 1 request. Reserving one or multiple PRACH preambles for the purpose of a SIB 1 request allows the gNB to allocate a suitable UL grant size for the RACH Msg3 that carries the detailed SIB1 transmission request information (e.g., the list of cell IDs). It should be noted that the size of a Msg3 might be different for the different use cases (e.g., initial access and SIB1 request or SI request). In response to the transmission of the PRACH, the UE monitors for a RAR acknowledging the reception of the SIB 1 request and also allocating UL resources for the transmission of the detailed SIB1 request info. The detailed SIB1 request messagecan be transmitted either by means of a new MAC CE or by RRC signaling (e.g., a new SIB1 request RRC message, as described above).

[0076] In one or more implementations, a new random access response message format is introduced for the purpose of a SIB 1 request procedure. According to an implementation, the RAR message for a SIB1 request does not contain a RNTI field, which is indicating a RNTI (e.g., temporary C-RNTI) used for addressing a RACH Msg4 and used for allocation of the C-RNTI after the successful completion of the RACH procedure. In an example, a new MAC RAR is introduced, which is comprised of a timing advance field and an UL grant field. According to an implementation, if the RAPID in the MAC sub-header of a MAC sub-PDU corresponds to one of the random access preambles configured or reserved for a SIB1 request, the new MAC RAR (e.g., being comprised of a timing advance and UL grant field), is included in the MAC sub-PDU.

[0077] In one or more implementations, the request of SIB 1 and other on-demand SI messages is combined in one request message. According to an implementation, a new RRC message is introduced which includes a bitmap (as in the SystemlnfoRequest message) indicating the requested SI messages and a field indicating the request for SIB 1. Alternatively, a list of identifies identifying the cells for which SIB1 information is requested is included in the new RRC message. In an implementation, a UE includes, in the RACH Msg3, the new SIB1 request MAC CE indicating the request for a SIB1 transmission and the SystemlnfoRequest message. In another implementation, the UE sends a preamble or PRACH resource reserved or configured for SIB1 request and transmits, in the RACH Msg3, the SystemlnfoRequest message in order to request SIB1 and other on-demand SIBs and SI messages for the gNB.

[0078] Although the various different implementations are indicated in the context of a 4-step random access procedure, the disclosed aspects of the SIB 1 transmission request procedure are equally applicable to the 2-step random access procedure. The 2-step RACH procedure consists of a MsgA transmission from the UE to the network and a MsgB response message from the network to the UE. The MsgA can be represented as combination of RACH Msgl (Preamble) and RACH Msg3 (PUSCH transmission). The MsgB can be generally seen as a combination of RAR (RACH Msg2) and RACH Msg4 (contention resolution).

[0079] Figure 7 illustrates an example of a UE 700 in accordance with aspects of the present disclosure. The UE 700 may include a processor 702, a memory 704, a controller 706, and a transceiver 708. The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0080] The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0081] The processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 702 may be configured to operate the memory 704. In some other implementations, the memory 704 may be integrated into the processor 702. The processor 702 may be configured to execute computer-readable instructions stored in the memory 704 to cause the UE 700 to perform various functions of the present disclosure.

[0082] The memory 704 may include volatile or non-volatile memory. The memory 704 may store computer-readable, computer-executable code including instructions when executed by the processor 702 cause the UE 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 704 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0083] In some implementations, the processor 702 and the memory 704 coupled with the processor 702 may be configured to cause the UE 700 to perform one or more of the functionsdescribed herein (e.g., executing, by the processor 702, instructions stored in the memory 704). For example, the processor 702 may support wireless communication at the UE 700 in accordance with examples as disclosed herein. The UE 700 may be configured to or operable to support a means for receiving, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources; transmitting, to the NE, a request for one or more SIB1 transmissions; and receiving, from the NE, an acknowledgement of the request for the one or more SIB1 transmissions.

[0084] Additionally, the UE 700 may be configured to support any one or combination of the method further comprising transmitting, to the NE, the preamble transmission. The method further comprising transmitting the request for the one or more SIB 1 transmissions based on the response message received from the NE. The request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB1 transmissions. The method further comprising monitoring for a feedback response from the NE over a predetermined time duration, the feedback response including the acknowledgement of the request for the one or more SIB 1 transmissions. The feedback response is included in a contention resolution message that includes an indication of reception of the one or more SIB 1 transmissions as requested. The feedback response included in the contention resolution message is a MAC CE. The MAC CE is a contention resolution identity transmitted in a Msg4 of a RACH procedure. The request for the one or more SIB 1 transmissions is transmitted in a Msg3 of a RACH procedure. The request for the one or more SIB 1 transmissions comprises a bitmap indicating the request for the one or more SIB 1 transmissions. The bitmap indicates a SIB 1 request for one or more cells, and the bitmap is transmitted in a Msg3 of a RACH procedure. A feedback response is included in a contention resolution message that comprises a second bitmap that matches the bitmap transmitted in the Msg3 to request the one or more SIB1 transmissions. The request for the one or more SIB1 transmissions is transmitted in a RRC message.

[0085] Additionally, or alternatively, the UE 700 may support at least one memory (e.g., the memory 704) and at least one processor (e.g., the processor 702) coupled with the at least one memory and configured to cause the UE to receive, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources; transmit, to the NE,a request for one or more SIB1 transmissions; and receive, from the NE, an acknowledgement of the request for the one or more SIB 1 transmissions.

[0086] Additionally, the UE 700 may be configured to support any one or combination of the at least one processor is configured to cause the UE to transmit, to the NE, the preamble transmission. The at least one processor is configured to cause the UE to transmit the request for the one or more SIB 1 transmissions based on the response message received from the NE. The request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB 1 transmissions. The at least one processor is configured to cause the UE to monitor for a feedback response from the NE over a predetermined time duration, the feedback response including the acknowledgement of the request for the one or more SIB 1 transmissions. The feedback response is included in a contention resolution message that includes an indication of reception of the one or more SIB 1 transmissions as requested. The feedback response included in the contention resolution message is a MAC CE. The MAC CE is a contention resolution identity transmitted in a Msg4 of a RACH procedure. The request for the one or more SIB 1 transmissions is transmitted in a Msg3 of a RACH procedure. The request for the one or more SIB 1 transmissions comprises a bitmap indicating the request for the one or more SIB1 transmissions. The bitmap indicates a SIB 1 request for one or more cells, and the bitmap is transmitted in a Msg3 of a RACH procedure. A feedback response is included in a contention resolution message that comprises a second bitmap that matches the bitmap transmitted in the Msg3 to request the one or more SIB 1 transmissions. The request for the one or more SIB1 transmissions is transmitted in a RRC message.

[0087] The controller 706 may manage input and output signals for the UE 700. The controller 706 may also manage peripherals not integrated into the UE 700. In some implementations, the controller 706 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 706 may be implemented as part of the processor 702.

[0088] In some implementations, the UE 700 may include at least one transceiver 708. In some other implementations, the UE 700 may have more than one transceiver 708. The transceiver 708 may represent a wireless transceiver. The transceiver 708 may include one or more receiver chains 710, one or more transmitter chains 712, or a combination thereof.

[0089] A receiver chain 710 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 710 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 710 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 710 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 710 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0090] A transmitter chain 712 may be configured to generate and transmit signals (e.g., control information, data, packets). The transmitter chain 712 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM). The transmitter chain 712 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 712 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0091] Figure 8 illustrates an example of a processor 800 in accordance with aspects of the present disclosure. The processor 800 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 800 may include a controller 802 configured to perform various operations in accordance with examples as described herein. The processor 800 may optionally include at least one memory 804, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 800 may optionally include one or more arithmetic-logic units (ALUs) 806. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses).

[0092] The processor 800 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipsetmay include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 800) or other memory (e.g., random access memory (RAM), read-only memory (ROM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), static RAM (SRAM), ferroelectric RAM (FeRAM), magnetic RAM (MRAM), resistive RAM (RRAM), flash memory, phase change memory (PCM), and others).

[0093] The controller 802 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein. For example, the controller 802 may operate as a control unit of the processor 800, generating control signals that manage the operation of various components of the processor 800. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

[0094] The controller 802 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 804 and determine subsequent instruction(s) to be executed to cause the processor 800 to support various operations in accordance with examples as described herein. The controller 802 may be configured to track memory addresses of instructions associated with the memory 804. The controller 802 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 802 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 802 may be configured to manage flow of data within the processor 800. The controller 802 may be configured to control transfer of data between registers, ALUs 806, and other functional units of the processor 800.

[0095] The memory 804 may include one or more caches (e.g., memory local to or included in the processor 800 or other memory, such as RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800). In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800).

[0096] The memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 800, cause the processor 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 802 and / or the processor 800 may be configured to execute computer-readable instructions stored in the memory 804 to cause the processor 800 to perform various functions. For example, the processor 800 and / or the controller 802 may be coupled with or to the memory 804, the processor 800, and the controller 802, and may be configured to perform various functions described herein. In some examples, the processor 800 may include multiple processors and the memory 804 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

[0097] The one or more ALUs 806 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 806 may reside within or on a processor chipset (e.g., the processor 800). In some other implementations, the one or more ALUs 806 may reside external to the processor chipset (e.g., the processor 800). One or more ALUs 806 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 806 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 806 may be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 806 may support logical operations such as AND, OR, exclusive-OR (XOR), not-OR (NOR), and not-AND (NAND), enabling the one or more ALUs 806 to handle conditional operations, comparisons, and bitwise operations.

[0098] The processor 800 may support wireless communication in accordance with examples as disclosed herein. The processor 800 may be configured to or operable to support at least one controller (e.g., the controller 802) coupled with at least one memory (e.g., the memory 804) and configured to cause the processor to receive, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources; transmit, to the NE, a request for one or more SIB1 transmissions; and receive, from the NE, an acknowledgement of the request for the one or more SIB 1 transmissions.

[0099] Additionally, the processor 800 may be configured to or operable to support any one or combination of the at least one controller is configured to cause the processor to transmit, to the NE, the preamble transmission. The at least one controller is configured to cause the processor to transmit the request for the one or more SIB 1 transmissions based on the response message received from the NE. The request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB1 transmissions. The at least one controller is configured to cause the processor to monitor for a feedback response from the NE over a predetermined time duration, the feedback response including the acknowledgement of the request for the one or more SIB1 transmissions. The feedback response is included in a contention resolution message that includes an indication of reception of the one or more SIB 1 transmissions as requested. The feedback response included in the contention resolution message is a MAC CE. The MAC CE is a contention resolution identity transmitted in a Msg4 of a RACH procedure. The request for the one or more SIB 1 transmissions is transmitted in a Msg3 of a RACH procedure. The request for the one or more SIB 1 transmissions comprises a bitmap indicating the request for the one or more SIB 1 transmissions. The bitmap indicates a SIB 1 request for one or more cells, and the bitmap is transmitted in a Msg3 of a RACH procedure. A feedback response is included in a contention resolution message that comprises a second bitmap that matches the bitmap transmitted in the Msg3 to request the one or more SIB1 transmissions. The request for the one or more SIB1 transmissions is transmitted in a RRC message.

[0100] Figure 9 illustrates an example of an NE 900 in accordance with aspects of the present disclosure. The NE 900 may include a processor 902, a memory 904, a controller 906, and a transceiver 908. The processor 902, the memory 904, the controller 906, or the transceiver 908, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0101] The processor 902, the memory 904, the controller 906, or the transceiver 908, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereofconfigured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0102] The processor 902 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 902 may be configured to operate the memory 904. In some other implementations, the memory 904 may be integrated into the processor 902. The processor 902 may be configured to execute computer-readable instructions stored in the memory 904 to cause the NE 900 to perform various functions of the present disclosure.

[0103] The memory 904 may include volatile or non-volatile memory. The memory 904 may store computer-readable, computer-executable code including instructions when executed by the processor 902 cause the NE 900 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 904 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0104] In some implementations, the processor 902 and the memory 904 coupled with the processor 902 may be configured to cause the NE 900 to perform one or more of the functions described herein (e.g., executing, by the processor 902, instructions stored in the memory 904). For example, the processor 902 may support wireless communication at the NE 900 in accordance with examples as disclosed herein. The NE 900 may be configured to or operable to support a means for transmitting, to a UE, a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources; receiving, from the UE, a request for one or more SIB1 transmissions; and transmitting, to the UE, an acknowledgement of the request for the one or more SIB1 transmissions.

[0105] Additionally, the NE 900 may be configured to or operable to support any one or combination of the method further comprising receiving, from the UE, the preamble transmission. The request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB1 transmissions. The method further comprising transmitting theacknowledgement of the request for the one or more SIB1 transmissions as a feedback response to the UE during a predetermined time duration. The feedback response is included in a contention resolution message, and the feedback response is a MAC CE. The MAC CE is a contention resolution identity received in a Msg4 of a RACH procedure. The request for the one or more SIB 1 transmissions is received in a Msg3 of a RACH procedure. The request for the one or more SIB1 transmissions comprises a bitmap indicating the request for the one or more SIB 1 transmissions. The bitmap indicates a SIB 1 request for one or more cells, and the bitmap is received in a Msg3 of a RACH procedure. The request for the one or more SIB 1 transmissions is received in a RRC message.

[0106] Additionally, or alternatively, the NE 900 may support at least one memory (e.g., the memory 904) and at least one processor (e.g., the processor 902) coupled with the at least one memory and configured to cause the NE to transmit, to a UE, a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources; receive, from the UE, a request for one or more SIB1 transmissions; and transmit, to the UE, an acknowledgement of the request for the one or more SIB 1 transmissions.

[0107] Additionally, the NE 900 may be configured to support any one or combination of the at least one processor is configured to cause the NE to receive, from the UE, the preamble transmission. The request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB1 transmissions. The at least one processor is configured to cause the NE to transmit the acknowledgement of the request for the one or more SIB 1 transmissions as a feedback response to the UE during a predetermined time duration. The feedback response is included in a contention resolution message, and the feedback response is a MAC CE. The MAC CE is a contention resolution identity received in a Msg4 of a RACH procedure. The request for the one or more SIB1 transmissions is received in a Msg3 of a RACH procedure. The request for the one or more SIB1 transmissions comprises a bitmap indicating the request for the one or more SIB1 transmissions. The bitmap indicates a SIB1 request for one or more cells, and the bitmap is received in a Msg3 of a RACH procedure. The request for the one or more SIB 1 transmissions is received in a RRC message.

[0108] The controller 906 may manage input and output signals for the NE 900. The controller 906 may also manage peripherals not integrated into the NE 900. In some implementations, thecontroller 906 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 906 may be implemented as part of the processor 902.

[0109] In some implementations, the NE 900 may include at least one transceiver 908. In some other implementations, the NE 900 may have more than one transceiver 908. The transceiver 908 may represent a wireless transceiver. The transceiver 908 may include one or more receiver chains 910, one or more transmitter chains 912, or a combination thereof.

[0110] A receiver chain 910 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 910 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 910 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 910 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 910 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0111] A transmitter chain 912 may be configured to generate and transmit signals (e.g., control information, data, packets). The transmitter chain 912 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM). The transmitter chain 912 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 912 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0112] Figure 10 illustrates a flowchart of a method 1000 in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions. It should be noted that the method described hereindescribes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0113] At 1002, the method may include receiving, from a NE, a response message to a preamble transmission, the response message including an allocation of uplink resources. The operations of 1002 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1002 may be performed by a UE as described with reference to Figure 7.

[0114] At 1004, the method may include transmitting, to the NE, a request for one or more SIB 1 transmissions. The operations of 1004 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1004 may be performed by a UE as described with reference to Figure 7.

[0115] At 1006, the method may include receiving, from the NE, an acknowledgement of the request for the one or more SIB1 transmissions. The operations of 1006 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1006 may be performed a UE as described with reference to Figure 7.

[0116] Figure 11 illustrates a flowchart of a method 1100 in accordance with aspects of the present disclosure. The operations of the method may be implemented by an NE as described herein. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0117] At 1102, the method may include transmitting, to a UE, a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources. The operations of 1102 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1102 may be performed by an NE as described with reference to Figure 9.

[0118] At 1104, the method may include receiving, from the UE, a request for one or more SIB1 transmissions. The operations of 1104 may be performed in accordance with examples asdescribed herein. In some implementations, aspects of the operations of 1104 may be performed by an NE as described with reference to Figure 9.

[0119] At 1106, the method may include transmitting, to the UE, an acknowledgement of the request for the one or more SIB 1 transmissions. The operations of 1106 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1106 may be performed an NE as described with reference to Figure 9.

[0120] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

CLAIMSWhat is claimed is:

1. A user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and operable to cause theUE to: receive, from a network equipment (NE), a response message to a preamble transmission, the response message including an allocation of uplink resources; transmit, to the NE, a request for one or more system information block 1 (SIB1) transmissions; and receive, from the NE, an acknowledgement of the request for the one or more SIB1 transmissions.

2. The UE of claim 1 , wherein the at least one processor is operable to cause the UE to transmit, to the NE, the preamble transmission.

3. The UE of claim 1, wherein the at least one processor is operable to cause the UE to transmit the request for the one or more SIB1 transmissions based at least in part on the response message received from the NE.

4. The UE of claim 1, wherein the request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB 1 transmissions.

5. The UE of claim 1, wherein the at least one processor is operable to cause the UE to monitor for a feedback response from the NE over a predetermined time duration, the feedback response including the acknowledgement of the request for the one or more SIB 1 transmissions.

6. The UE of claim 1, wherein the request for the one or more SIB 1 transmissions is transmitted in a message 3 (Msg3) of a random access channel (RACH) procedure.

7. The UE of claim 1, wherein the request for the one or more SIB 1 transmissions comprises a bitmap indicating the request for the one or more SIB1 transmissions.

8. The UE of claim 1, wherein the request for the one or more SIB 1 transmissions is transmitted in a radio resource control (RRC) message.

9. A method performed by a user equipment (UE), the method comprising: receiving, from a network equipment (NE), a response message to a preamble transmission, the response message including an allocation of uplink resources; transmitting, to the NE, a request for one or more system information block 1 (SIB1) transmissions; and receiving, from the NE, an acknowledgement of the request for the one or more SIB 1 transmissions.

10. The method of claim 9, further comprising transmitting, to the NE, the preamble transmission.

11. The method of claim 9, further comprising transmitting the request for the one or more SIB 1 transmissions based at least in part on the response message received from the NE.

12. The method of claim 9, wherein the request for the one or more SIB 1 transmissions includes one or more identifiers that identify a serving cell for the one or more SIB 1 transmissions.

13. The method of claim 9, further comprising monitoring for a feedback response from the NE over a predetermined time duration, the feedback response including the acknowledgement of the request for the one or more SIB 1 transmissions.

14. The method of claim 9, wherein the request for the one or more SIB 1 transmissions is transmitted in a message 3 (Msg3) of a random access channel (RACH) procedure.

15. The method of claim 9, wherein the request for the one or more SIB 1 transmissions comprises a bitmap indicating the request for the one or more SIB1 transmissions.

16. The method of claim 9, wherein the request for the one or more SIB 1 transmissions is transmitted in a radio resource control (RRC) message.

17. A network equipment (NE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and operable to cause the NE to: transmit, to a user equipment (UE), a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources; receive, from the UE, a request for one or more system information block 1 (SIB1) transmissions; and transmit, to the UE, an acknowledgement of the request for the one or more SIB1 transmissions.

18. The NE of claim 17, wherein the at least one processor is configured to cause the NE to receive, from the UE, the preamble transmission.

19. The NE of claim 17, wherein the at least one processor is operable to cause the NE to transmit the acknowledgement of the request for the one or more SIB1 transmissions as a feedback response to the UE during a predetermined time duration.

20. A method performed by a network equipment (NE), the method comprising: transmitting, to a user equipment (UE), a response message to a preamble transmission received from the UE, the response message including an allocation of uplink resources; receiving, from the UE, a request for one or more system information block 1 (SIB1) transmissions; and transmitting, to the UE, an acknowledgement of the request for the one or more SIB 1 transmissions.

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