System information for changing a configuration

Apparatuses, methods, and systems are disclosed for transmitting and/or receiving system information for changing a configuration. One apparatus includes a receiver that: receives first system information for a first configuration; and receives second system information for a second configuration based on the first configuration. The second system information includes changes to the first configuration without repeating information common to the first and second configurations.

FIELD

The subject matter disclosed herein relates generally to wireless communications and more particularly relates to system information for changing a configuration.

BACKGROUND

The following abbreviations are herewith defined, at least some of which are referred to within the following description: Third Generation Partnership Project (“3GPP”), Positive-Acknowledgment (“ACK”), Binary Phase Shift Keying (“BPSK”), Clear Channel Assessment (“CCA”), Cyclic Prefix (“CP”), Channel State Information (“CSI”), Common Search Space (“CSS”), Discrete Fourier Transform Spread (“DFTS”), Downlink Control Information (“DCI”), Downlink (“DL”), Downlink Pilot Time Slot (“DwPTS”), Enhanced Clear Channel Assessment (“eCCA”), Enhanced Mobile Broadband (“eMBB”), Evolved Node B (“eNB”), European Telecommunications Standards Institute (“ETSI”), Frame Based Equipment (“FBE”), Frequency Division Duplex (“FDD”), Frequency Division Multiple Access (“FDMA”), Guard Period (“GP”), Hybrid Automatic Repeat Request (“HARQ”), Internet-of-Things (“IoT”), Licensed Assisted Access (“LAA”), Load Based Equipment (“LBE”), Listen-Before-Talk (“LBT”), Long Term Evolution (“LTE”), Multiple Access (“MA”), Modulation Coding Scheme (“MCS”), Machine Type Communication (“MTC”), Multiple Input Multiple Output (“MIMO”), Multi User Shared Access (“MUSA”), Narrowband (“NB”), Negative-Acknowledgment (“NACK”) or (“NAK”), Next Generation Node B (“gNB”), Non-Orthogonal Multiple Access (“NOMA”), Orthogonal Frequency Division Multiplexing (“OFDM”), Primary Cell (“PCell”), Physical Broadcast Channel (“PBCH”), Physical Downlink Control Channel (“PDCCH”), Physical Downlink Shared Channel (“PDSCH”), Pattern Division Multiple Access (“PDMA”), Physical Hybrid ARQ Indicator Channel (“PHICH”), Physical Random Access Channel (“PRACH”), Physical Resource Block (“PRB”), Physical Uplink Control Channel (“PUCCH”), Physical Uplink Shared Channel (“PUSCH”), Quality of Service (“QoS”), Quadrature Phase Shift Keying (“QPSK”), Radio Resource Control (“RRC”), Random Access Procedure (“RACH”), Random Access Response (“RAR”), Reference Signal (“RS”), Resource Spread Multiple Access (“RSMA”), Round Trip Time (“RTT”), Receive (“RX”), Sparse Code Multiple Access (“SCMA”), Scheduling Request (“SR”), Single Carrier Frequency Division Multiple Access (“SC-FDMA”), Secondary Cell (“SCell”), Shared Channel (“SCH”), Signal-to-Interference-Plus-Noise Ratio (“SINR”), System Information Block (“SIB”), Transport Block (“TB”), Transport Block Size (“TBS”), Time-Division Duplex (“TDD”), Time Division Multiplex (“TDM”), Transmission Time Interval (“TTI”), Transmit (“TX”), Uplink Control Information (“UCI”), User Entity/Equipment (Mobile Terminal) (“UE”), Uplink (“UL”), Universal Mobile Telecommunications System (“UMTS”), Uplink Pilot Time Slot (“UpPTS”), Ultra-reliability and Low-latency Communications (“URLLC”), and Worldwide Interoperability for Microwave Access (“WiMAX”). As used herein, “HARQ-ACK” may represent collectively the Positive Acknowledge (“ACK”) and the Negative Acknowledge (“NAK”). ACK means that a TB is correctly received while NAK means a TB is erroneously received.

In certain wireless communications networks, some system information may be transmitted and/or received more often than is necessary. In some configurations, indexes and/or identifiers may be transmitted in system information and used by UEs to enable the UEs to avoid reacquisition of already stored system information.

In certain configurations, there may be a large number of indexes and/or identifiers. For example, each system information block or collection of system information blocks may include a large number of parameters. A given network may use particular values of each parameter to configure the UEs in the network at a given point of time. An index and/or identifier for each possible configuration of parameters may be very large. In certain configurations, UEs may store a configuration corresponding to each index and/or identifier. This may take a large amount of storage space for the UEs. Moreover, a large load may be placed on a network transmitting each configuration corresponding to each index and/or identifier and UEs may store a large number of configurations taking up considerable storage space. In various configurations, there may be a small number of indexes and/or identifiers. In such configurations, there may be a limited number of configurations available to UEs.

BRIEF SUMMARY

Apparatuses for receiving system information for changing a configuration are disclosed. Methods and systems also perform the functions of the apparatus. In one embodiment, the apparatus includes a receiver that: receives first system information for a first configuration; and receives second system information for a second configuration based on the first configuration. In various embodiments, the second system information includes changes to the first configuration without repeating information common to the first and second configurations.

In one embodiment, the first system information includes a system information block. In a further embodiment, the second system information includes changes to parameter values of the system information block. In certain embodiments, the second system information includes additional parameters to those in the system information block. In various embodiments, the second system information indicates that it is based on the first system information. In some embodiments, the first system information, the second system information, or some combination thereof is discarded after a predetermined period of time.

A method for receiving system information for changing a configuration, in one embodiment, includes receiving first system information for a first configuration. In various embodiments, the method includes receiving second system information for a second configuration based on the first configuration. In certain embodiments, the second system information includes changes to the first configuration without repeating information common to the first and second configurations.

In one embodiment, an apparatus includes a transmitter that transmits first system information for a first configuration. In certain embodiments, the first configuration includes multiple system information blocks. In various embodiments, the transmitter transmits second system information indicating system information blocks of the multiple system information blocks that have a second configuration available to be transmitted. In some embodiments, the second configuration is based on the first configuration and includes changes to the first configuration without repeating information common to the first and second configurations.

In one embodiment, the second system information includes a list of system information blocks that are not included in the first system information. In a further embodiment, the second system information includes scheduling information for system information blocks of the list of system information blocks. In certain embodiments, the second system information includes scheduling information for information corresponding to the second configuration of the indicated system information blocks of the multiple system information blocks that have the second configuration available to be transmitted. In various embodiments, the second system information includes information indicating whether the second configuration for the indicated system information blocks of the multiple system information blocks is broadcast by default, broadcast by demand, or some combination thereof.

In some embodiments, the transmitter transmits third system information indicating the second configuration for the indicated system information blocks of the multiple system information blocks. In one embodiment, the third system information includes changes to parameter values of the indicated system information blocks of the multiple system information blocks. In certain embodiments, the third system information includes additional parameters to those of the indicated system information blocks of the multiple system information blocks. In various embodiments, the first system information, the second system information, the third system information, or some combination thereof is discarded after a predetermined period of time. In some embodiments, the multiple system information blocks include a first system information block of a first type and a second system information block of the first type, and the first and second system information blocks are different from one another.

In one embodiment, the second system information includes scheduling information for system information blocks broadcast regularly, system information blocks not broadcast regularly, system information blocks using the first configuration without the second configuration, system information blocks using the first configuration with the second configuration, or some combination thereof. In certain embodiments, the second system information includes a two-bit indication for each system information block indicating whether the respective system information block is broadcast regularly, not broadcast regularly, uses the first configuration without the second configuration, or uses the first configuration with the second configuration.

A method for transmitting system information for changing a configuration, in one embodiment, includes transmitting first system information for a first configuration. In some embodiments, the first configuration includes multiple system information blocks. In various embodiments, the method includes transmitting second system information indicating system information blocks of the multiple system information blocks that have a second configuration available to be transmitted. In certain embodiments, the second configuration is based on the first configuration and includes changes to the first configuration without repeating information common to the first and second configurations.

DETAILED DESCRIPTION

FIG. 1depicts an embodiment of a wireless communication system100for transmitting and/or receiving system information for changing a configuration. In one embodiment, the wireless communication system100includes remote units102and base units104. Even though a specific number of remote units102and base units104are depicted inFIG. 1, one of skill in the art will recognize that any number of remote units102and base units104may be included in the wireless communication system100.

The base units104may be distributed over a geographic region. In certain embodiments, a base unit104may also be referred to as an access point, an access terminal, a base, a base station, a Node-B, an eNB, a gNB, a Home Node-B, a relay node, a device, or by any other terminology used in the art. The base units104are generally part of a radio access network that includes one or more controllers communicably coupled to one or more corresponding base units104. The radio access network is generally communicably coupled to one or more core networks, which may be coupled to other networks, like the Internet and public switched telephone networks, among other networks. These and other elements of radio access and core networks are not illustrated but are well known generally by those having ordinary skill in the art.

In one implementation, the wireless communication system100is compliant with the LTE of the 3GPP protocol, wherein the base unit104transmits using an OFDM modulation scheme on the DL and the remote units102transmit on the UL using a SC-FDMA scheme or an OFDM scheme. More generally, however, the wireless communication system100may implement some other open or proprietary communication protocol, for example, WiMAX, among other protocols. The present disclosure is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol.

The base units104may serve a number of remote units102within a serving area, for example, a cell or a cell sector via a wireless communication link. The base units104transmit DL communication signals to serve the remote units102in the time, frequency, and/or spatial domain.

In one embodiment, a base unit104may first system information for a first configuration to the remote unit102. In some embodiments, the first configuration may include one system information block, while in other embodiments, the first configuration may include multiple information blocks. In certain embodiments, the base unit104may transmit to the remote unit102second system information indicating system information blocks of multiple system information blocks that have a second configuration available to be transmitted. In various embodiments, the second configuration is based on the first configuration and includes changes to the first configuration without repeating information common to the first and second configurations. Accordingly, a base unit104may be used for transmitting system information for changing a configuration.

In another embodiment, a remote unit102may receive first system information for a first configuration. The remote unit102may receive second system information for a second configuration based on the first configuration. In some embodiments, the second system information includes changes to the first configuration without repeating information common to the first and second configurations. Accordingly, a remote unit102may be used for receiving system information for changing a configuration.

The transmitter210is used to provide UL communication signals to the base unit104and the receiver212is used to receive DL communication signals from the base unit104. In various embodiments, the receiver212may be used to receive first system information for a first configuration (e.g., base configuration, multiple base configurations, etc.). In some embodiments, the receiver212may be used to receive second system information for a second configuration (e.g., delta configuration, multiple delta configurations, etc.) based on the first configuration. In certain embodiments, the second system information includes changes to the first configuration without repeating information common to the first and second configurations. Although only one transmitter210and one receiver212are illustrated, the remote unit102may have any suitable number of transmitters210and receivers212. The transmitter210and the receiver212may be any suitable type of transmitters and receivers. In one embodiment, the transmitter210and the receiver212may be part of a transceiver.

In various embodiments, the transmitter310is used to transmit first system information for a first configuration to the remote unit102. In some embodiments, the first configuration includes multiple system information blocks, while in other embodiments, the first configuration includes one system information block. In some embodiments, the transmitter310may be used to transmit second system information to the remote unit102. In one embodiment, the second system information indicates system information blocks of the multiple system information blocks that have a second configuration available to be transmitted. In various embodiments, the second configuration is based on the first configuration and includes changes to the first configuration without repeating information common to the first and second configurations. Although only one transmitter310and one receiver312are illustrated, the base unit104may have any suitable number of transmitters310and receivers312. The transmitter310and the receiver312may be any suitable type of transmitters and receivers. In one embodiment, the transmitter310and the receiver312may be part of a transceiver.

FIG. 4illustrates one embodiment of communications400for system information for changing a configuration. Specifically, communications400between a UE402and a gNB404are illustrated. The communications400may facilitate providing the UE402with various configurations.

In certain embodiments, the gNB404may transmit first system information406to the UE402. In one embodiment, the first system information406includes one or more base configurations. Any system information block may have one or more base configurations. In various embodiments, there may be multiple base configurations for one system information block. Each of the base configurations may include particular values for parameters of one system information block, accordingly, each of the base configurations differ from one another because even if the base configurations are for the same system information block, the values assigned to at least some of the parameters will differ. In some embodiments, a base configuration may be identified using the following syntax SIBtype, index; where type refers to the content of the SIB (e.g., SIB2has a type value of “2”), and index defines a particular configuration of SIB2. In various embodiments, a base configuration may have a universal scope and/or applicability or it may apply only to a limited area like a tracking area (“TA”), a radio access network (“RAN”) area, a paging area, and so forth. In certain embodiments, the UE402may acquire and store base configurations corresponding to one or more different scopes. As used herein, “scope” may refer to a geographical area which may be a tracking area, a routing area, or a RAN area specifically designed for a purpose (e.g., a collection of cells, a RAN paging area etc.). In some embodiments, scope may be limited or universal meaning that the acquired/used or broadcasted base configuration indexes are valid in a limited area or in an entire geography like a public land mobile network (“PLMN”) area. Accordingly, when a UE402changes its scope, the UE402may use only the base configurations corresponding to its new scope and, in certain embodiments, may retain the base configuration corresponding to its previous scope that can be used upon the UEs re-entry in the previous scope at a later point in time.

As used herein, base configuration (“BC”) may refer to a configuration with respect to a particular SIB. In one example, there may be 20 SIBs defined. A first cell/network might broadcast only 18 of the 20 defined SIBs because of various features that the first cell/network does not support. Out of 18 broadcast SIBs, 10 SIBs (e.g., SIB2to SIB11) may be provided using a base configuration and the remaining 8 SIBs may be transmitted in full (e.g., either broadcast regularly or provided on-demand) For the 10 SIBs that have a base configuration, some SIBs may have one base configuration (e.g., BC-a) while other SIBs may have multiple base configurations (e.g., BC-a, BC-b, BC-c, etc.). For example, SIB2might use BC-a for SIB2, while SIB3might use BC-b for SIB3, and SIB4might use BC-a for SIB4, and so forth. A second cell/network might provide only 5 SIBs (e.g., SIB10to SIB14) using a base configuration. In certain embodiments, a UE may request BCs of a current cell/network (e.g., the first cell/network) and/or a neighboring cell/network (e.g., the second cell/network).

In some embodiments, the UE402may store the first system information406and use the first system information406for multiple different cells/networks that are part of the same scope. For example, when the UE402moves out of one cell/network into another cell/network, the UE402may keep the first system information406stored. Moreover, the first system information406may remain unchanged when the UE402moves between cells/networks.

In some embodiments, the gNB404may transmit additional system information408(e.g., second system information, third system information, etc.) to the UE402. In certain embodiments, the first system information406and/or the additional system information408may be transmitted together. In various embodiments, the first system information406and/or the additional system information408may be considered system information or first system information.

In certain embodiments, the additional system information408may include system information (e.g., second or third system information) for a second configuration (e.g., delta configuration) based on the first configuration. In some embodiments, the second configuration includes changes to the first configuration without repeating information common to the first and second configurations. In various embodiments, the second configuration may refer to one or more delta configurations for one or more system information blocks. In one embodiment, the term “Delta-SI” may refer to a parameter set in which parameters have been assigned values different from the values assigned to a base configuration. The Delta-SI may include only the parameter set out of the base configuration that has parameters different from the base configuration. In other words, the Delta-SI may be considerably smaller in size than the base configuration because it only includes parameters for a delta configuration that are changed from the base configuration. In some embodiments, a base configuration that is closest to a configuration that a current cell/network needs may be called a “referred base configuration.” In certain embodiments, a cell/network may choose a referred base configuration from a set of base configurations for a given SIB and may signal a Delta-SI along with the referred base configuration to the UEs in the cell/network. Accordingly, the UEs in the cell/network may use the configuration from the referred base configuration except for the parameter set found in the Delta-SI. In various embodiments, upon leaving the cell/network, the UE402may delete any Delta-SIs so that the configuration of the referred base configuration remains the same as it was before the UE402entered the cell/network.

In some embodiments, there may be more than one base configuration for a particular type of SIB. For example, for SIB2, there may be two base configurations, a′ and b′ denoted SIB2,a′and SIB2,b′, respectively. In one embodiment, a particular cell/network may find SIB2,a′to be the most suitable and may only need to change a few of the parameter values of SIB2,a′. In certain embodiments, Delta-SI may contain new values of an existing parameter of a particular SIB. In some embodiments, Delta-SI may contain new parameters for a particular SIB. In various embodiments, Delta-SI may contain new values of an existing parameter of a particular SIB and/or new parameters for the particular SIB.

Changes made by a cell/network may be one of many different types. For example, the cell/network may change from using a fully transmitted SIB (e.g., an SIB transmitted with actually signaling values of all parameters required in the cell/network) to a particular base configuration of the same SIB (e.g., type 1 change). A UE that receives this type 1 change may start using the new values corresponding to the particular base configuration if it has this base configuration for this SIB stored; otherwise, it may initiate acquisition of the SIB (e.g., based on scheduling information using broadcast channel or using an on-demand system information request procedure). As another example, the cell/network may change from using a base configuration of an SIB to using a fully transmitted SIB (e.g., type 2 change). As a further example, the cell/network may change from using a first base configuration of an SIB having a certain type to a second base configuration of the same SIB (e.g., type 3 change). As an additional example, the cell/network may change from using a first Delta-SI for an SIB to using a second Delta-SI for the SIB (e.g., type 4 change) and for this change the base configuration in which the second Delta-SI is applied remains the same (e.g., the same base configuration in which the first Delta-SI was being applied).

Depending on whether the type of change is a type 1 change, a type 2 change, a type 3 change, or a type 4 change, different combinations of a value tag, minimum system information, and/or paging messages may be used. For example, for a type 1 change, the change may be indicated in a paging message directly. As another example, for a type 1 change, the minimum system information may indicate the change and the UE402may notice the change with every minimum system information modification period (e.g., every 80 ms, etc.). As a further example, for a type 2 change, a paging message may indicate an SIB/system information change without carrying the content of the change. In such an example, the UE402may acquire the changed SIB/system information starting from the reacquisition of minimum system information, then scheduling information, and then the SIB. As another example, a type 3 change may be done like a type 1 change. Furthermore, as an additional example, a type 4 change may be done by either a type 1 or a type 2 change, depending on the volume of the change.

In one embodiment, the system information includes scheduling information for system information blocks broadcast regularly, system information blocks not broadcast regularly, system information blocks using the first configuration without the second configuration, system information blocks using the first configuration with the second configuration, or some combination thereof. In certain embodiments, the second system information includes a two-bit indication for each system information block indicating whether the respective system information block is broadcast regularly, not broadcast regularly, uses the first configuration without the second configuration, or uses the first configuration with the second configuration. Further, the second system information may indicate if the second configuration(s) for their corresponding system information block(s) are broadcast regularly or not broadcast regularly. For system information block(s) or for second configuration(s) indicated as not broadcast regularly, the UE may need to request them on an on-demand basis (e.g., request them using a RACH procedure). Two methods are applicable here; one, in which a UE transmits a particular specified/configured preamble to signal the SIB(s) or SI(s) that it is requesting; second, in which the UE includes detailed information about its required SIB(s) or SI(s) optionally with the base configurations that it needs in a current cell/network or in a different cell/network within the geographical scope using a RACH message 3 (“msg3”). The detailed information could be a bitmap having one bit for each of the SIB-type and the UE sets the bit(s) corresponding to the SIB-type(s) that it does not have stored. In one particular embodiment, the UE may request the exact base configurations for each SIB-type that it needs.

The UE402may discard (e.g., delete, remove, etc.) base configurations in one of many different ways. For example, in one embodiment, base configurations may not be discarded unless explicitly signaled by a cell/network to discard one or more of the base configurations. In certain embodiments, a cell/network may explicitly signal to discard a particular base configuration, all base configurations of one SIB, and/or all base configurations of many SIBs. As another example, in some embodiments, every base configuration and/or SIB may have a built-in three hour discard timer so that after three hours the respective base configuration and/or SIB will be discarded. The three hour discard time may begin running at a time that the base configuration and/or SIB configuration is received by the UE402or at a time that the base configuration and/or SIB is transmitted from the gNB404. As a further example, in various embodiments, a cell/network may configure which base configurations and/or SIBs are subject to a three hour discard, which base configurations and/or SIBs are not subject to a three hour discard, and/or when the three hour discard timer is started. As yet another example, in certain embodiments, every base configuration and/or SIB may be discarded every three hours. In certain embodiments, a UE402may request that a cell/network provide any unavailable (or discarded) SIBs or system information on an as-needed (e.g., on-demand) basis.

FIG. 5is a schematic flow chart diagram illustrating one embodiment of a method500for transmitting system information for changing a configuration. In some embodiments, the method500is performed by an apparatus, such as the base unit104. In certain embodiments, the method500may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like.

The method500may include transmitting502minimum system information. In certain embodiments, the minimum system information may include information indicating PBCH, portions of SIB1for using and/or accessing a cell/network, portions of SIB2for using and/or accessing a cell/network, and so forth. The method500may also include transmitting504a used base configuration of all SIBs that are transmitted using a base configuration. The method500may include transmitting506an indication of which base configuration SIBs have a delta configuration (e.g., “Delta-SIB”). The method500may also include transmitting508a list of SIBs that are transmitted in full without using a base configuration (e.g., SIBs that are available on-demand by a remote unit102, “remaining SIBs”). The method500may include transmitting510scheduling information for Delta-SI and for the list of SIBs that are transmitted in full without using a base configuration. In some embodiments, Delta-SIBs may be carried as part of one or more Delta-SI. For example, in one embodiment, there may be system information carrying only Delta-SIBs. In certain embodiments, most SIBs are carried in system information (“SI”) messages and mapping of SIBs to SI messages is flexibly configurable by a scheduling information list included in minimum system information (e.g., second system information), with certain restrictions for example: each SIB is contained only in a single SI message, and at most once in that message; only SIBs having the same scheduling requirement (e.g., periodicity) may be mapped to the same SI message etc. In certain embodiments, different SI messages may carry one or more SIBs in full or in delta, the used base configuration of one or more SIBs, or a combination thereof, where SI is transmitted according to the scheduling information. In various embodiments, a special SI message may carry some or all Delta-SIB configurations.

FIG. 6is a schematic flow chart diagram illustrating another embodiment of a method600for transmitting system information for changing a configuration. In some embodiments, the method600is performed by an apparatus, such as the base unit104. In certain embodiments, the method600may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like.

The method600may include transmitting602minimum system information. In certain embodiments, the minimum system information may include information indicating PBCH, portions of SIB1for using and/or accessing a cell/network, portions of SIB2for using and/or accessing a cell/network, and so forth. The method600may also include transmitting604a list of SIBs that are transmitted. In one embodiment, a flag may be transmitted with an SIB in the list indicating whether the SIB is always transmitted or transmitted on-demand (e.g., when requested). The method600may include transmitting606scheduling information for the list of SIBs. The method600may also include transmitting608a used base configuration of each SIB that is transmitted using a base configuration. The method600may include transmitting610an indication of which base configuration SIBs have a delta configuration (e.g., “Delta-SIB”). In certain embodiments, a system information message may carry one or more SIBs. For example, in one embodiment, the system information carries information for two SIBs, one that a Delta-SIB and uses a base configuration and another that is a full SIB.

FIG. 7is a schematic flow chart diagram illustrating one embodiment of a method700for receiving system information for changing a configuration. In some embodiments, the method700is performed by an apparatus, such as the remote unit102. In certain embodiments, the method700may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like.

The method700may include receiving702first system information for a first configuration. The method700also includes receiving704second system information for a second configuration based on the first configuration. In certain embodiments, the second system information includes changes to the first configuration without repeating information common to the first and second configurations.

In one embodiment, the first system information includes a system information block. In another embodiment, the first system information may include multiple system information blocks. In a further embodiment, the second system information includes changes to parameter values of one or more system information blocks. In certain embodiments, the second system information includes additional parameters to those in the system information block. In various embodiments, the second system information indicates that it is based on the first system information. In some embodiments, the first system information, the second system information, or some combination thereof is discarded (e.g., deleted) after a predetermined period of time.

FIG. 8is a schematic flow chart diagram illustrating a further embodiment of a method800for transmitting system information for changing a configuration. In some embodiments, the method800is performed by an apparatus, such as the base unit104. In certain embodiments, the method800may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like.

The method800may include transmitting802first system information for a first configuration for a remote unit102. In some embodiments, the first configuration includes one or more system information blocks. The method800also includes transmitting804second system information indicating system information blocks of one or more system information blocks that have a second configuration available to be transmitted. In various embodiments, the second configuration is based on the first configuration and includes changes to the first configuration without repeating information common to the first and second configurations.

In one embodiment, the second system information includes a list of system information blocks that are not included in the first system information. In a further embodiment, the second system information includes scheduling information for system information blocks of the list of system information blocks. In certain embodiments, the second system information includes scheduling information for information corresponding to the second configuration of the indicated system information blocks of the one or more system information blocks that have the second configuration available to be transmitted. In various embodiments, the second system information includes information indicating whether the second configuration for the indicated system information blocks of the one or more system information blocks is broadcast (e.g., transmitted) by default, broadcast by demand, or some combination thereof.

In some embodiments, the transmitter transmits third system information indicating the second configuration for the indicated system information blocks of the one or more system information blocks. In one embodiment, the third system information includes changes to parameter values of the indicated system information blocks of the one or more system information blocks. In certain embodiments, the third system information includes additional parameters to those of the indicated system information blocks of the one or more system information blocks. In various embodiments, the first system information, the second system information, the third system information, or some combination thereof is discarded after a predetermined period of time. In some embodiments, the one or more system information blocks include a first system information block of a first type and a second system information block of the first type, and the first and second system information blocks are different from one another.

In one embodiment, the second system information includes scheduling information for system information blocks broadcast regularly, system information blocks not broadcast regularly, system information blocks using the first configuration without the second configuration, system information blocks using the first configuration with the second configuration, or some combination thereof. In certain embodiments, the second system information includes a two-bit indication for each system information block indicating whether the respective system information block is broadcast regularly, not broadcast regularly, uses the first configuration without the second configuration, or uses the first configuration with the second configuration.