CN113973367A

CN113973367A - User equipment, base station and method thereof

Info

Publication number: CN113973367A
Application number: CN202010720448.6A
Authority: CN
Inventors: 肖芳英; 刘仁茂; 罗超
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2022-01-25
Also published as: WO2022017461A1

Abstract

According to the invention, a method performed by a user equipment, UE, capable of multi-network association with at least a first communication network and a second communication network is proposed, comprising: the UE working in the first communication network constructs a request message which comprises a first indication used for indicating the first communication network to release the time information of the UE leaving the first communication network; and sending the request message to the first communication network.

Description

User equipment, base station and method thereof

Technical Field

The present disclosure relates to the field of wireless communication technologies, and in particular, to a user equipment, a base station, and a method thereof.

Background

In recent years, multi-USIM card apparatuses have become increasingly popular. For example, a user installs two USIM cards on a mobile phone supporting multiple USIM cards, one of which is used to subscribe to private services and the other is used to subscribe to office services. The existing equipment supporting multiple USIM cards is realized based on manufacturers and is not standardized by 3 GPP. Different manufacturers adopt different implementation modes, and the behaviors of the user equipment UE are different. In existing implementations, if a UE registered to two or more networks needs to receive pages from these networks, based on the transceiving capabilities of the UE, there may be a situation where the UE also initiates pages to another network when receiving pages of the current network, or where another network initiates pages to one network when the UE is communicating with the other network. One result that may result if the UE switches between different networks is that the UE is no longer able to receive data from the current network when the UE switches to another network. This would impair network performance, for example, if the network sent a page to the UE but the UE did not receive the page by switching to another network, or if the UE switched to another network and could not receive the scheduling of the current network. A benefit of 3GPP standardization is that it can improve network performance based on predictable UE behavior.

For the above reasons, in 12 months in 2019, at the third Generation Partnership Project (3rd Generation Partnership Project: 3GPP) RAN # 86-time congress, vivo proposed and approved work projects for the release 17 Multi-SIM card device (see non-patent document: RP-193263: New WID: Stupport of Multi-SIM devices in Rel-17). One of the goals of this work project is to solve the problem that UEs associated to two networks (network a and network B) through different USIM cards collide in receiving pages from the two networks, where network a may be NR, network B may be LTE or NR, and UE Single-receive-Single-issue (Single-Rx/Single-Tx); another objective of this work item is to define a mechanism for the UE to notify network a when leaving network a, where network a is NR, network B is LTE or NR, and UE Single-receive/Single-Tx or UE Dual-receive/Single-Tx.

The present disclosure discusses related problems involved in achieving the above-mentioned operational goals.

Disclosure of Invention

In order to solve at least part of the above problems, the present invention provides a user equipment, a base station and a method thereof, which can avoid the conflict when the user equipment adopting a multi-network association mode receives the paging from multiple networks.

In order to achieve the above object, according to the present invention, there is provided a method performed by a user equipment UE capable of multi-network association with at least a first communication network and a second communication network, comprising: the UE working in the first communication network constructs a request message which comprises a first indication used for indicating the first communication network to release the time information of the UE leaving the first communication network; and sending the request message to the first communication network.

Preferably, the method further comprises: receiving reply information for the request message from the first communication network.

Preferably, the request message is a radio resource control, RRC, connection establishment request message or an RRC connection continuation request message, the response message to the RRC connection establishment request message is an RRC connection rejection message, and the response message to the RRC connection continuation request message is an RRC connection release message.

Preferably, the time information when the UE leaves the first communication network is predetermined according to the time information when a paging message from the second communication network is to be received.

Further, according to the present invention, there is provided a method performed by a user equipment, UE, comprising: receiving a system information message from a base station; and if the system information message comprises a first indication for indicating that a base station can support paging of the UE adopting a multi-network association mode, and the UE supports the multi-network association mode or works in the multi-network association mode, the UE detects and acquires the paging message at a first paging moment, otherwise, the UE detects and acquires the paging message at a second paging moment.

Preferably, the first paging occasion is a paging occasion based on a hopping pattern, and a paging frame of the first paging occasion is determined based on a system frame number and a paging frame offset given in a corresponding communication network.

Furthermore, according to the present invention, there is provided a user equipment comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method described above.

Further, according to the present invention, there is provided a method performed by a base station communicating with a user equipment, UE, capable of multi-network association with at least a first communication network and a second communication network, the method comprising: receiving a request message from the UE operating in the first communication network, the request message including a first indication for instructing the first communication network to release time information for the UE to leave the first communication network; and transmitting response information for the request message to the UE.

Furthermore, according to the present invention, there is provided a method performed by a base station, comprising: sending a system information message to User Equipment (UE); and the UE executes the method when receiving the system information message.

Further, according to the present invention, there is provided a base station including: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method described above.

Effects of the invention

According to the invention, the conflict generated when the user equipment adopting the multi-network association mode receives the paging from a plurality of networks can be avoided.

Drawings

The above and other features of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a flowchart illustrating a method performed by a user equipment according to a first embodiment of the present invention.

Fig. 2 is a flow chart illustrating a method performed by a user equipment according to a second embodiment of the present invention.

Fig. 3 is a block diagram schematically illustrating a user equipment to which the present invention relates.

Fig. 4 is a block diagram schematically illustrating a base station according to the present invention.

Detailed Description

The present disclosure is described in detail below with reference to the attached drawings and detailed description. It should be noted that the present disclosure should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present disclosure are omitted to prevent confusion of understanding of the present disclosure.

Some terms related to the present disclosure are described below, and specific meanings of the terms are described in 3GPP latest relevant documents, such as TS38.300, TS38.331, TS36.300, TS36.331, and the like.

NAS: non-access stratum.

AS: access stratum.

RRC: radio Resource Control, Radio Resource Control.

RRC _ CONNECTED: RRC connected state.

RRC _ INACTIVE: RRC inactive state.

RRC _ IDLE: RRC idle state.

RAN; radio Access Network, Radio Access layer.

USIM: universal Subscriber Identity Module, global Subscriber Identity card.

Tx: transmitter, sender.

Rx: receiver, receiver.

NR: new RAT, New radio access technology.

In the present disclosure, the network, the base station, and the RAN may be used interchangeably, and the network may be a long term evolution LTE network, an NR network, an enhanced long term evolution LTE network, or other networks defined in subsequent evolution releases of 3 GPP.

In the present disclosure, the user equipment UE may refer to an apparatus that physically supports multiple USIM cards (two or more USIM cards) to which two or more USIM cards are mounted, each USIM card being associated with one network. From the network perspective, different USIM cards correspond to different UEs, and each USIM card corresponds to one UE. This disclosure does not distinguish between them, unless specifically stated otherwise. Those skilled in the art can easily determine whether the UE refers to a multi-USIM card-capable UE or a UE corresponding to each USIM card in a multi-USIM card-capable apparatus according to the context. The user equipment configured with the multiple USIM cards can receive and/or transmit data from a plurality of networks by using single receiving and single transmitting or double receiving and single transmitting in a time division multiplexing mode, and for the UE with two Rx, the data can be received from the two networks at the same time.

In the present disclosure, a user equipment UE having a plurality of USIM cards has Single-Rx/Single-Tx (Single-Rx/Single-Tx) or Dual-Rx/Single-Tx (Dual-Rx/Single-Tx) capabilities. Different UEs corresponding to multiple USIMs share a pair of Tx and Rx or share one Tx but have respective Rx.

In the present disclosure, the UE operating in one network (network a) means that the UE is in an RRC connected state or an RRC inactive state or an RRC idle state in the network a, and monitors (receives/sends data or signaling from) the network a while leaving the network a periodically or intermittently to monitor another network (network B), for example, to receive a paging message from the network B. The UE may indicate to network a the time information of leaving network a (e.g., the time information of the UE receiving the paging message of network B) such that network a does not send data to the UE or does not schedule the UE for the period of time the UE leaves. Network a and network B may be different networks or the same network.

In this disclosure, the time information of the UE leaving the network refers to that, when the UE operates in the current network, the current network will not schedule the UE or the UE does not receive data from the current network or is not expected to be scheduled by the current network in the time period indicated by the time information of the UE leaving the network. The time information when the UE leaves the network is the time information when the UE reports to the network or when the UE negotiates with the network that the UE does not expect to be scheduled by the current network or does not expect to receive data from the current network. The UE indicates the network to release the time information indicating that the UE leaves the network, where the time information indicating that the UE leaves the network and reported by the UE or negotiated with the UE is deleted or released or considered to be invalid or disabled, and at this time, the network may schedule the UE or send data to the UE within a time period indicated by the time information indicating that the UE leaves the network when scheduling the UE.

Consider the following scenario where the UE is operating in network a and reports to network a the time information that the UE left network a, but the UE needs to establish an RRC connection to network B. If the UE reports time information leaving network B (e.g., time information when the UE receives a paging message of network B) to network B, network B will not send data to the UE or schedule the UE within the time information leaving network B indicated by the UE. If the UE indicates to network a both the time information of leaving network a and the time information of leaving network B, there may be an overlap between the two time information, and neither network a nor network B may transmit data to the UE or not schedule the UE during the overlapping time period, which may reduce the throughput of the UE. The present disclosure will provide embodiments to address this problem.

The following describes an embodiment in which the UE instructs the network a to release the time information that the UE left the network a.

As shown in fig. 1, in step 101, an RRC layer of the UE constructs an RRC message, for example, the RRC message is an RRC connection establishment request message RRCSetupRequest or an RRC connection continuation request message, and the RRC message carries an indication identifier (referred to as a first indication) for indicating the network a to release time information of the UE leaving the network a. For example, the indication identifier is a parameter establistering cause carried in the RRC connection establishment request message, and a value of the parameter is a predefined value used for instructing the network a to release time information that the UE leaves the network a, for example, the value is absenepperiodrelease; for another example, the indication identifier is a parameter resumecuse carried in the RRC connection continuation request message, and a value of the parameter is a predefined value used for instructing the network a to release time information that the UE leaves the network a, for example, the value is abseneperiodrelease (which may be set to the same value as the establishmencause).

Then, in step 103, the UE submits (submit) the request message to the lower layer for transmission.

Optionally, the UE receives a response message from the network. If the UE sends the RRC connection setup request message, the response message may be an RRC connection reject message RRCReject; if the UE sends the RRC connection continuation request message, the response message may be an RRC connection release message rrcreelease.

Optionally, after receiving the response message (the RRC layer of the UE sends the request message and receives the response message), the UE sends a second indication to an upper layer (for example, the NAS layer), where the second indication is used to indicate that the UE has requested the network a to release the time information that the UE leaves the network a, or the UE successfully indicates that the network a releases the time information that the UE leaves the network a, or the network a successfully releases the time information that the UE leaves the network a.

Optionally, after receiving the indication that the request message from the lower layer is successfully sent, the UE sends a second indication to the upper layer (for example, the NAS layer), where the second indication is used to indicate that the UE has requested the network a to release the time information that the UE leaves the network a, or the UE successfully indicates that the network a releases the time information that the UE leaves the network a, or the network a successfully releases the time information that the UE leaves the network a.

In the present disclosure, the parameter instablimentcause is used to provide a reason for establishing the RRC connection request provided by the upper layer (services the RRC connection request for the RRC connection request as provided by the upper layer); the resumecuse parameter is used to provide the cause of the RRC connection resume request provided by the upper layer (services the resume use for the RRC connection resume request as provided by the upper layer).

The following describes an embodiment in which the UE side sends an indication to the RRC layer for the NAS layer of network a to release the time information that the UE left network a.

The RRC layer receives a request for establishing an RRC connection from an upper layer (e.g., NAS layer) or receives a request for resuming (Resume) a suspended (suspended) RRC connection from the upper layer, where the reason for establishing the RRC connection or resuming the RRC connection provided by the upper layer is to instruct the network to release time information of the UE leaving the current network, such as abseneperiodevent release (the same value as that carried in the RRC connection establishment request message RRCSetupRequest or the RRC connection resumption request message, specifically, see an embodiment where the UE instructs the network a to release time information of the UE leaving the network a). The RRC layer constructs an RRC connection establishment request message RRCSetupRequest or an RRC connection continuation request message, and sets a parameter establishmencause or a parameter ResumeCause to a value indicated by an upper layer, which is specifically seen in an embodiment in which the UE indicates the network a to release time information when the UE leaves the network a.

The following describes an embodiment in which the RRC layer for network a indicates to an upper layer time information for leaving network a negotiated with network a.

The RRC layer of the UE receives an RRC connection reject message or an RRC connection release message RRCRelease from the network, wherein the message comprises an indication identifier, the indication identifier can be used for indicating the UE network to support the time information of UE leaving the current network or the time information of UE leaving the current network, and the indication identifier can be used for indicating the time information of UE leaving the current network, which is negotiated for continuing use or reported by the UE, to the network of an upper layer (such as the NAS layer), or the time information of UE leaving the current network or the time information of UE having negotiated with the current network for leaving the current network. Optionally, if the RRC connection release message RRCRelease includes the indication identifier (or the value of the indication identifier is the first value), it indicates that the network supports to continue using the negotiated or UE-reported time information of the UE leaving the current network; if the RRC connection release message RRCRelease does not include the indicator (or includes the indicator and the value of the indicator is the second value), it indicates that the network does not support the time information of the UE leaving the current network, which is negotiated for continuous use or reported by the UE, and the RRC layer may indicate that the upper layer network does not support the time information of the UE leaving the current network, which is negotiated for continuous use or reported by the UE, or the time information of the UE leaving the current network without negotiating with the current network.

Embodiments for avoiding data collision between the UE in network a and network B based on Hopping (Hopping) are described below.

Firstly, a base station receives a request message for Paging a UE from a core network, and if the request message carries a third indication identifier, the base station sends a Paging message to the UE at a first Paging Occasion (PO), and if the request carries a fourth indication identifier (or the request does not carry the third indication identifier), the base station sends the Paging message to the UE at a second Paging Occasion. It should be noted that the fourth indication identifier may be an explicit indication identifier different from the third indication identifier, or may be an implicit indication identifier, that is, when the request message does not carry the third indication identifier, it indicates that the fourth indication identifier is carried.

As shown in fig. 2, in step 201, the UE receives a system information message from a base station.

In step 203, if the system information message includes the fifth indicator, it indicates that the base station supports paging for UEs supporting the MUSIM, or the base station supports two paging time calculation methods, or the base station supports a paging time calculation method based on hopping, or the base station supports the first paging time. The fifth indication may also be used to indicate a parameter required for the UE to calculate the first paging occasion. The UE calculates PF and PO based on the parameters indicated by the fifth indication. The PF and PO calculated by the UE according to the fifth index are different or may be different from the PF and PO corresponding to the second paging occasion.

At this time, if the UE supports the MUSIM or operates in the MUSIM mode, the paging message is detected/acquired at the first paging occasion, otherwise, the paging message is detected/acquired at the second paging occasion.

In the present disclosure, the second paging occasion is a paging occasion calculated in a manner defined in current TS38.304 section 7 paging. A Paging Frame (PF) of the second Paging occasion is SFN determined by the following formula:

(SFN+PF_offset)mod T＝(T div N)*(UE_ID mod N)

the Index (i _ s) used to indicate the PO is determined by (Index (i _ s), indicating the Index of the PO is determined by):

i_s＝floor(UE_ID/N)mod Ns

in the present disclosure, a method of determining PO according to the index (i _ s) is defined in TS 38.304.

In the present disclosure, the first paging occasion is a paging based on a hopping scheme. An embodiment of calculating the first paging occasion of the UE is given below, and in the following embodiment, a method for calculating the PF and PO based on the hopping pattern is related to the system frame number, specifically:

the paging frame PF of the first paging occasion is the SFN determined by the following formula:

(SFN+PF_offset)mod T＝((T div N)*(UE_ID mod N))mod N

i_s＝(floor(UE_ID/N)mod Ns+SFN mod Ns)mod Ns

in the present disclosure, SFN is a system frame number, PF _ offset is a paging frame offset for determining a paging frame, T is a discontinuous reception cycle (DRX cycle) of the UE, whose value is the smaller of the default DRX values broadcast in system information by RRC or UE-specific DRX values configured by an upper layer (DRX cycle of the UE (T is determined by the short of the UE specific DRX value (S)), if configured by RRC and/or upper layer layers, and a default DRX value in system information, N is the total number of paging frames in T (number of total paging frames in T), UE _ ID is 5G-S-TMSI mode 1024, is a number of PO in PF.

In this disclosure, mod is the modulo operation, div is the division, x is the multiplication, and floor is the rounding down.

It should be noted that in the present disclosure, the NAS layer may be replaced by an entity in the core network that handles related procedures, such as an access and mobility management function AMF.

In the embodiments of the present disclosure, the RRC layer or NAS layer for network a refers to a peer layer of the RRC layer or NAS layer of network a, and layers and entities may be used interchangeably.

In the embodiment of the disclosure, the UE operating in network a, the UE supporting multiple USIM cards, the UE configured with multiple USIM cards, the UE with network B lower layer transport unavailable, the UE with network B Tx/Rx unavailable, the UE indicated by the network that it supports access of multiple USIM cards UE and the UE is a UE supporting multiple USIM cards, the UE is configured to report time information leaving the current network, the UE supporting dynamic switching among different networks, and the UE sharing Tx and/or Rx may be used interchangeably.

In the disclosed embodiment, the resume _ c _ ause field is included in an RRC connection resume request message for requesting to resume (resume) a suspended RRC connection, which provides a resume reason (e.g., the resume use of the RRC connection for the RRC connection resume request) for sending the RRC connection resume request

In the present disclosure, a UE with multiple USIM cards means that the UE includes two or more USIM cards and accesses or registers or resides in different or the same networks, respectively. For example, one of the USIM cards subscribes to network a, and the other USIM card subscribes to network B. The USIM card information or access information according to which the UE is registered on the two networks is scheduled by the networks or communicates with the networks, respectively. The UE supporting multiple USIM cards may also be referred to as a UE sharing one Tx, or a UE sharing a pair of Rx and Tx. The pair of Rx and Tx includes one Rx and one Tx.

In the embodiment of the present disclosure, the RRC, RRC entity, and RRC layer may be used interchangeably, and the NAS, NAS entity, and NAS layer may be used interchangeably, and those skilled in the art can easily infer the meaning of these words according to contextual information.

[ modified examples ]

As a modification, a user equipment capable of executing the method performed by the user equipment described in detail above of the present invention is explained below with reference to fig. 3.

Fig. 3 is a block diagram showing a user equipment UE according to the present invention.

As shown in fig. 3, the user equipment UE30 includes a processor 301 and a memory 302. The processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 302 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 302 has stored thereon program instructions. Which when executed by the processor 301 may perform the above-described method performed by the user equipment as described in detail in the present invention.

As a modification, a base station that can execute the method of the present invention described above by the base station will be described below with reference to fig. 4.

Fig. 4 is a block diagram showing a base station according to the present invention.

As shown in fig. 4, the base station 40 includes a processor 401 and a memory 402. The processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 402 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 402 has stored thereon program instructions. Which when executed by the processor 401 may perform the above-described method performed by the base station as detailed in the present invention.

Specifically, according to the first embodiment, a base station communicates with a user equipment UE capable of performing multi-network association with at least a first communication network and a second communication network, receives a request message from the UE operating in the first communication network, where the request message includes a first indication for instructing the first communication network to release time information of the UE leaving the first communication network; and transmitting response information for the request message to the UE. The second communication network may be different from the first communication network, or the first and second communication networks may be the same network.

Corresponding to the second embodiment, the base station sends a system information message to the user equipment UE; and the UE executes the method shown in fig. 2 when receiving the system information message.

In addition, the computer-executable instructions or programs running on the apparatus according to the present disclosure may be programs that cause a computer to realize the functions of the embodiments of the present disclosure by controlling a Central Processing Unit (CPU). The program or information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a Hard Disk Drive (HDD), a nonvolatile memory (such as a flash memory), or other memory system.

Computer-executable instructions or programs for implementing the functions of embodiments of the present disclosure may be recorded on a computer-readable storage medium. The corresponding functions can be realized by causing a computer system to read the programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable storage medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.

Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technology has emerged as a replacement for existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using such new integrated circuit technology.

Further, the present disclosure is not limited to the above-described embodiments. While various examples of the embodiments have been described, the present disclosure is not so limited. Fixed or non-mobile electronic devices installed indoors or outdoors may be used as terminal devices or communication devices, such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, vending machines, and other home appliances.

As above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above embodiment, and the present disclosure also includes any design modification without departing from the gist of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. Further, components having the same effects described in the above embodiments may be substituted for each other.

Claims

1. A method performed by a user equipment, UE, capable of multi-network association with at least a first communication network and a second communication network, comprising:

the UE working in the first communication network constructs a request message which comprises a first indication used for indicating the first communication network to release the time information of the UE leaving the first communication network; and

sending the request message to the first communication network.

2. The method of claim 1, further comprising:

receiving reply information for the request message from the first communication network.

3. The method of claim 1, wherein,

the request message is a Radio Resource Control (RRC) connection establishment request message or an RRC connection continuation request message,

the response message to the RRC connection setup request message is an RRC connection reject message, and the response message to the RRC connection resume request message is an RRC connection release message.

4. The method of claim 1, wherein,

the time information when the UE leaves the first communication network is predetermined according to the time information when a paging message from the second communication network is to be received.

5. A method performed by a User Equipment (UE), comprising:

receiving a system information message from a base station; and

if the system information message comprises a first indication for indicating that a base station can support paging of UE adopting a multi-network association mode, and the UE supports the multi-network association mode or works in the multi-network association mode, the UE detects and acquires a paging message at a first paging moment, otherwise, the UE detects and acquires the paging message at a second paging moment.

6. The method of claim 5, wherein,

the first paging occasion is a hopping-mode-based paging occasion, and a paging frame of the first paging occasion is determined based on a system frame number and a paging frame offset given in a corresponding communication network.

7. A user equipment, comprising:

a processor; and

a memory having stored therein instructions that, when executed,

wherein the instructions, when executed by the processor, perform the method of any of claims 1 to 6.

8. A method performed by a base station communicating with a user equipment, UE, capable of multi-network association with at least a first communication network and a second communication network, the method comprising:

receiving a request message from the UE operating in the first communication network, the request message including a first indication for instructing the first communication network to release time information for the UE to leave the first communication network; and

and sending response information aiming at the request message to the UE.

9. A method performed by a base station, comprising:

sending a system information message to User Equipment (UE); and

the UE, upon receiving the system information message, performs the method of claim 5.

10. A base station, comprising:

a processor; and

a memory having stored therein instructions that, when executed,

wherein the instructions, when executed by the processor, perform the method of claim 8 or 9.