I 1111111111111111 1111111111 111111111111111 IIIII 1111111111111111 IIII IIII IIII
`US010512027B2
`
`c12) United States Patent
`Fan et al.
`
`(IO) Patent No.: US 10,512,027 B2
`(45) Date of Patent:
`Dec. 17, 2019
`
`(54) ON-DEMAND REQUEST FOR SYSTEM
`INFORMATION
`
`(71) Applicant: Telefonaktiebolaget LM Ericsson
`(pnbl), Stockholm (SE)
`
`(72)
`
`Inventors: Rui Fan, Beijing (CN); Jinhua Liu,
`Beijing (CN); Pal Frenger, Linkoping
`(SE)
`
`(73) Assignee: Telefonaktiebolaget LM Ericsson
`(pub!), Stockholm (SE)
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 55 days.
`
`(21) Appl. No.:
`
`15/568,431
`
`(22) PCT Filed:
`
`Sep. 13, 2017
`
`(86) PCT No.:
`
`PCT/CN2017/101576
`
`§ 371 (c)(l),
`(2) Date:
`
`Oct. 20, 2017
`
`(87) PCT Pub. No.: WO2018/126731
`
`PCT Pub. Date: Jul. 12, 2018
`
`(65)
`
`Prior Publication Data
`
`US 2018/0302841 Al
`
`Oct. 18, 2018
`
`(30)
`
`Foreign Application Priority Data
`
`Jan. 4, 2017
`
`(WO) ................ PCT/CN2017/070130
`
`(51)
`
`(52)
`
`(2009.01)
`(2009.01)
`(2009.01)
`
`Int. Cl.
`H04W48/08
`H04W72/04
`H04W48/14
`U.S.Cl.
`CPC ........... H04W 48/08 (2013.01); H04W 48/14
`(2013.01); H04W 72/0446 (2013.01);
`(Continued)
`
`(58) Field of Classification Search
`CPC .. H04W 48/08; H04W 48/14; H04W 72/0446
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`5/2012 Jung et al.
`2012/0106516 Al
`2015/0351011 Al* 12/2015 Shukla .................. H04W 48/16
`455/434
`6/2018 Ishii .................... H04W 72/042
`
`2018/0167918 Al•
`
`FOREIGN PATENT DOCUMENTS
`
`CN
`CN
`
`2/2008
`101123818 A
`7/2008
`101217689 A
`(Continued)
`
`OTHER PUBLICATIONS
`
`Samsung, R2-167563, 'On Demand SI Delivery: Signaling Aspects',
`3GPP TSG-RAN WG2 #96, Nov. 14-18, 2016, pp. 1-3. (Year:
`2016).•
`
`(Continued)
`
`Primary Examiner - Melvin C Marcelo
`(74) Attorney, Agent, or Firm - NDWE LLP
`
`ABSTRACT
`(57)
`A method for requesting system information. The method
`comprises transmitting a request for at least one system
`information block group, each of which comprises one or
`more system information blocks, from a user terminal to a
`network node. The one or more system information blocks
`is/are grouped according to a feature of the one or more
`system information blocks. The method may further com(cid:173)
`prise receiving one or more system information block
`groups from the network node. The one or more system
`information block groups may comprise the at least one
`system information block group.
`
`21 Claims, 2 Drawing Sheets
`
`Transmit a request for at least one SIB group, each
`of which comprises one or more SIBs, from a user
`terminal to a network node, where the one or more
`SIBs are grouped according to a feature of the one
`or more SIBs
`
`1 02
`l,,--J
`
`I
`
`Receive one or more SIB groups from the network
`node, where the one or more SIB groups comprise
`the at least one SIB group
`
`04
`1
`l,,--J
`
`Samsung Ex. 1001
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`

`

`US 10,512,027 B2
`Page 2
`
`(52) U.S. Cl.
`CPC .............. Y02D 70/00 (2018.01); Y02D 70/10
`(2018.01); Y02D 70/12 (2018.01); Y02D
`70/126 (2018.01); Y02D 70/1226 (2018.01);
`Y02D 70/1262 (2018.01); Y02D 70/21
`(2018.01)
`
`(56)
`
`References Cited
`
`FOREIGN PATENT DOCUMENTS
`
`CN
`EP
`EP
`EP
`GB
`
`101542915 A
`2903349 Al
`3413632 Al
`3454620 Al
`2506389 A
`
`9/2009
`8/2015
`12/2018
`3/2019
`4/2014
`
`OlHER PUBLICATIONS
`
`3GPP TS 25.331 V13.5.0 (Dec. 2016), "3rd Generation Partnership
`Project; Technical Specification Group Radio Access Network;
`Radio Resource Control (RRC); Protocol specification (Release
`13)," Dec. 2016, 2271 pages.
`International Search Report and Written Opinion for Application
`No. PCT/CN2017/101576, dated Nov. 30, 2017, 11 pages.
`Extended European Search Report for Application No. 17784155 .8,
`dated Apr. 11, 2019, 7 pages.
`Communication pursuant to Article 94(3) EPC received for Euro(cid:173)
`pean Patent Application No. 17784155.8, dated Jul. 22, 2019, 4
`pages.
`International Preliminary Report on Patentability received for PCT
`Patent Application No. PCT/CN2017/101576, dated Jul. 18, 2019,
`6 pages.
`Preliminary Search Report received for Moroccan Patent Applica(cid:173)
`tion No. 46151, completed on Oct. 2, 2019, 4 pages of Original
`Document Only.
`
`Examination Report from foreign counterpart Bangladesh Patent
`Application No. 256/2017/4370 0 dated Dec. 24 0 2018, 1 page.
`
`* cited by examiner
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Dec. 17, 2019
`
`Sheet 1 of 2
`
`US 10,512,027 B2
`
`Transmit a request for at least one SIB group, each
`of which comprises one or more SIBs, from a user
`terminal to a network node, where the one or more
`SIBs are grouped according to a feature of the one
`or more SIBs
`
`102
`l,--J
`
`Receive one or more SIB groups from the network
`node, where the one or more SIB groups comprise
`the at least one SIB group
`
`104
`l,,--J
`
`Fig.I
`
`Receive a request for at least one SIB group, each of
`which comprises one or more SIBs, from a user
`terminal to a network node, where the one or more
`SIBs are grouped according to a feature of the one
`or more SIBs
`
`202
`__J
`
`/
`
`Transmit one or more SIB groups from the network
`node, where the one or more SIB groups comprise
`the at least one SIB group
`
`/
`
`204
`__J
`
`Fig.2
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Dec. 17, 2019
`
`Sheet 2 of 2
`
`US 10,512,027 B2
`
`300
`
`APPARATUS
`
`301
`
`302
`
`PROCESSOR ..,_____,..
`
`MEMORY
`
`303
`
`Fig.3
`
`400
`
`APPARATUS
`
`401
`
`402
`
`Transmitting
`Module
`
`Receiving
`Module
`
`Fig.4
`
`Samsung Ex. 1001
`
`

`

`US 10,512,027 B2
`
`1
`ON-DEMAND REQUEST FOR SYSTEM
`INFORMATION
`
`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`
`This application is a National stage oflntemational Appli(cid:173)
`cation No. PCT/CN2017/101576, filed Sep. 13, 2017, which
`claims priority to International Application No. PCT/
`CN2017/070130, filed Jan. 4, 2017, which are hereby incor(cid:173)
`porated by reference.
`
`FIELD OF THE INVENTION
`
`The present disclosure generally relates to communica-
`tions, and more specifically, relates to wireless communica-
`tions.
`
`BACKGROUND
`
`15
`
`2
`In an exemplary embodiment, the method according to
`the first aspect of the present disclosure may further com(cid:173)
`prise receiving an indicator from the network node. The
`indicator may indicate at least one of: which SIB group is
`being transmitted from the network node, and which SIB
`group is scheduled to be transmitted from the network node.
`According to a second aspect of the present disclosure,
`there is provided an apparatus for requesting SI. The appa(cid:173)
`ratus may comprise at least one processor and at least one
`10 memory comprising computer program code. The at least
`one memory and the computer program code may be con(cid:173)
`figured to, with the at least one processor, cause the appa(cid:173)
`ratus at least to perform any step of the method according to
`the first aspect of the present disclosure.
`According to a third aspect of the present disclosure, there
`is provided a computer program product comprising a
`computer-readable medium bearing computer program
`codes embodied therein for use with a computer. The
`computer program codes may comprise code for performing
`20 any step of the method according to the first aspect of the
`present disclosure.
`According to a fourth aspect of the present disclosure,
`there is provided an apparatus for requesting SI. The appa(cid:173)
`ratus may comprise a transmitting module and a receiving
`25 module. In accordance with some exemplary embodiments,
`the transmitting module may be operable to carry out at least
`the transmitting step of the method according to the first
`aspect of the present disclosure. The receiving module may
`be operable to carry out at least the receiving step of the
`30 method according to the first aspect of the present disclo-
`sure.
`In accordance with an exemplary embodiment, the trans(cid:173)
`mission of the request may comprise transmitting a pre(cid:173)
`amble for indicating the at least one SIB group.
`In accordance with an exemplary embodiment, the trans-
`mission of the request may comprise: selecting, from a
`plurality of preambles, a preamble associated with the at
`least one SIB group; and transmitting the request to the
`network node. The request may include the selected pre-
`40 amble.
`In accordance with an exemplary embodiment, the at least
`one SIB group may be indicated by transmission timing of
`the preamble.
`In accordance with an exemplary embodiment, the trans-
`45 mission of the request may comprise transmitting the request
`to the network node in accordance with a selected transmis-
`sion timing associated with the at least one SIB group.
`According to a fifth aspect of the present disclosure, there
`is provided a method for transmission of SI, which may be
`performed at an apparatus such as a network node. The
`method may comprise receiving a request for at least one
`SIB group, each of which comprises one or more SIBs, from
`a user terminal to a network node. The one or more SIBs
`may be grouped according to a feature of the one or more
`SIBs. The method may further comprise transmitting one or
`more SIB groups from the network node. The one or more
`SIB groups may comprise the at least one SIB group.
`In accordance with an exemplary embodiment, the
`method according to the fifth aspect of the present disclosure
`60 may further comprise: transmitting notification information
`to the user terminal. For example, transmission of the at least
`one SIB group may be predefined or derived based at least
`partly on the notification information.
`In accordance with an exemplary embodiment, the
`65 method according to the fifth aspect of the present disclosure
`may further comprise transmitting an indicator from the
`network node. The indicator may indicate at least one of:
`
`In a communication network such as Long Term Evolu(cid:173)
`tion (LTE) system, system information (SI) is important as
`it can provide necessary information to a user terminal, such
`as a user equipment (UE) or a wireless device, for linking
`with the communication network. In new radio (NR), SI
`may be classified into minimum SI and other SI. Minimum
`SI is the SI that a user terminal must read before it can know
`how to access the network. Other SI is the SI not within
`minimum SI. SI may be transmitted to the user terminal in
`a master information block (MIB) and/or a system informa(cid:173)
`tion block (SIB). For example, minimum SI may correspond
`to MIB, SIB! and SIB2 in LTE. Other SI may correspond to
`those remaining SIBs. Since other SI is not necessary for a
`user terminal to access network, in order to achieve energy 35
`efficiency, it may be desirable that the SI may be requested
`on demand.
`
`SUMMARY
`
`This summary is provided to introduce a selection of
`concepts in a simplified form that are further described
`below in detailed description. This summary is not intended
`to identify key features or essential features of the claimed
`subject matter, nor is it intended to be used to limit the scope
`of the claimed subject matter.
`The present disclosure proposes a solution of on-demand
`request for SI, which may enable a communication network
`to transmit or broadcast SI, such as other SI as mentioned
`previously, according to a request for the SI from a user 50
`terminal.
`According to a first aspect of the present disclosure, there
`is provided a method for requesting SI, which may be
`performed at an apparatus such as a user terminal. The
`method may comprise transmitting a request for at least one 55
`SIB group, each of which comprises one or more SIBs, from
`a user terminal to a network node. The one or more SIBs
`may be grouped according to a feature of the one or more
`SIBs. The method may further comprise receiving one or
`more SIB groups from the network node. The one or more
`SIB groups may comprise the at least one SIB group.
`In an exemplary embodiment, the method according to
`the first aspect of the present disclosure may further com(cid:173)
`prise receiving notification information from the network
`node. For example, transmission of the at least one SIB
`group may be predefined or derived based at least partly on
`the notification information.
`
`Samsung Ex. 1001
`
`

`

`US 10,512,027 B2
`
`4
`following detailed description of the embodiments when
`read in conjunction with the accompanying drawings, in
`which:
`FIG. 1 is a flowchart illustrating a method for requesting
`SI according to an embodiment of the present disclosure;
`FIG. 2 is a flowchart illustrating a method for transmis(cid:173)
`sion of SI according to another embodiment of the present
`disclosure;
`FIG. 3 is a block diagram illustrating an apparatus accord(cid:173)
`ing to an embodiment of the present disclosure; and
`FIG. 4 is a block diagram illustrating another apparatus
`according to an embodiment of the present disclosure.
`
`DETAILED DESCRIPTION
`
`10
`
`3
`which SIB group is being transmitted from the network
`node, and which SIB group is scheduled to be transmitted
`from the network node.
`According to a sixth aspect of the present disclosure, there
`is provided an apparatus for transmission of SI. The appa(cid:173)
`ratus may comprise at least one processor and at least one
`memory comprising computer program code. The at least
`one memory and the computer program code may be con(cid:173)
`figured to, with the at least one processor, cause the appa(cid:173)
`ratus at least to perform any step of the method according to
`the fifth aspect of the present disclosure.
`According to a seventh aspect of the present disclosure,
`there is provided a computer program product comprising a
`computer-readable medium bearing computer program
`codes embodied therein for use with a computer. The
`computer program codes may comprise code for performing 15
`any step of the method according to the fifth aspect of the
`present disclosure.
`According to an eighth aspect of the present disclosure,
`there is provided an apparatus for transmission of SI. The
`apparatus may comprise a receiving module and a transmit- 20
`ting module. In accordance with some exemplary embodi(cid:173)
`ments, the receiving module may be operable to carry out at
`least the receiving step of the method according to the fifth
`aspect of the present disclosure. The transmitting module
`may be operable to carry out at least the transmitting step of 25
`the method according to the fifth aspect of the present
`disclosure.
`In accordance with an exemplary embodiment, the recep(cid:173)
`tion of the request may comprise receiving a preamble for
`indicating the at least one SIB group.
`In accordance with an exemplary embodiment, the recep(cid:173)
`tion of the request may comprise receiving the preamble
`which was selected from a plurality of preambles. The
`selected preamble may be associated with the at least one
`SIB group.
`In accordance with an exemplary embodiment, the at least 35
`one SIB group may be indicated by transmission timing of
`the preamble.
`In accordance with an exemplary embodiment, the recep(cid:173)
`tion of the request may comprise receiving the request from
`the user terminal in accordance with a selected transmission 40
`timing associated with the at least one SIB group.
`In accordance with an exemplary embodiment, the noti(cid:173)
`fication information may be included in minimum SI.
`In accordance with an exemplary embodiment, the noti(cid:173)
`fication information may indicate a correspondence between 45
`all of preambles and SIB groups.
`In accordance with some exemplary embodiments, the
`feature of the one or more SIBs may comprise at least one
`of functionality and periodicity of the one or more SIBs.
`In accordance with some exemplary embodiments, the 50
`request for the at least one SIB group may comprise a
`preamble for indicating the at least one SIB group. The at
`least one SIB group may be indicated by or associated with
`a preamble sequence or the transmission timing of the
`preamble. For example, the indication of the at least one SIB 55
`group by the preamble may be predefined or derived based
`at least partly on the notification information from the
`network node.
`In accordance with some exemplary embodiments, the
`one or more SIB groups from the network node may further
`comprise at least another SIB group which is not requested
`by the user terminal.
`
`30
`
`The embodiments of the present disclosure are described
`in detail with reference to the accompanying drawings.
`Reference throughout this specification to features, advan(cid:173)
`tages, or similar language does not imply that all of the
`features and advantages that may be realized with the
`present disclosure should be or are in any single embodi-
`ment of the disclosure. Rather, language referring to the
`features and advantages is understood to mean that a specific
`feature, advantage, or characteristic described in connection
`with an embodiment is included in at least one embodiment
`of the present disclosure. Furthermore, the described fea-
`tures, advantages, and characteristics of the disclosure may
`be combined in any suitable manner in one or more embodi(cid:173)
`ments. One skilled in the relevant art will recognize that the
`disclosure may be practiced without one or more of the
`specific features or advantages of a particular embodiment.
`In other instances, additional features and advantages may
`be recognized in certain embodiments that may not be
`present in all embodiments of the disclosure.
`In a wireless network such as new radio (NR), SI may be
`broadcasted by a network node, such as a base station or a
`next generation Node B (gNB), in a cell to all user terminals
`monitoring the specific cell. It is important for a user
`terminal to maintain the required SI because otherwise it
`carmot interact with the network in an interoperable marmer.
`As mentioned previously, minimum SI in NR corresponds to
`MIB, SIB! and SIB2 in LTE. There are some assumptions
`about how to request other SI from the network. For
`example, some messages like MSG 1 and/or MSG3 may be
`used to carry a request for other SI.
`If using one preamble of MSG 1 to carry a request for all
`other SI, then it may result in urmecessary transmission of
`some undesired other SI. This is because there is quite a lot
`of other SI in the system and the network may have to
`broadcast all other SI when it receives such preamble to
`request other SI. However, a user terminal may not need all
`the other SI.
`If using MSG3 to request other SI, since there could be
`contention during a random access procedure, the network
`may not be able to detect MSG3 reliably in time. In addition,
`there are additional overhead and delay because more mes-
`sages are transmitted for requesting other SI.
`The present disclosure proposes a solution of on-demand
`request for SI. In the proposed solution, one or more SIBs
`60 may be classified into a SIB group according to their
`relevance or correlation. When a user terminal wants to
`request some specific SI, it can request from a network node
`a SIB group in which the specific SI is contained. Then, the
`network node can know which SIB group the user terminal
`65 actually needs, and broadcast the requested SIB group
`accordingly. In this way, the network node can transmit or
`broadcast the SI to the user terminal with more energy
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The disclosure itself, the preferable mode of use and
`further objectives are best understood by reference to the
`
`Samsung Ex. 1001
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`

`US 10,512,027 B2
`
`6
`TABLE I-continued
`
`SIB
`
`Description
`
`SIBll
`
`SIB12
`
`SIB18
`
`SIB19
`
`ETWS (Earthquake and Tsunami Warning System) information
`(Secondary notification)
`Commercial Mobile Alert Service (CMAS) information.
`
`Sidelink UE information procedure, sidelink communication
`related resource configuration information
`Sidelink UE information procedure, sideli.nk discovery related
`resource configuration information
`
`5
`efficiency. On the other hand, transmission resources and
`energy also can be saved from the view point of the user
`terminal, since it does not need to send additional SI request
`if another user terminal has already sent a request for the
`same SI as required by the user terminal.
`FIG. 1 is a flowchart illustrating a method for requesting
`SI according to an embodiment of the present disclosure.
`The method illustrated in FIG. 1 may be performed by an
`apparatus implemented at a user terminal or communica(cid:173)
`tively coupled to a user terminal. In accordance with the 10
`exemplary embodiment, the user terminal may comprise a
`UE, a mobile station, a wireless device, a personal digital
`assistant (PDA), a laptop computer, a tablet computer, a
`smart phone, a portable device, or any other user device
`being capable of participating in communication of a wire- 15
`less network.
`According to the exemplary method illustrated in FIG. 1,
`a request for at least one SIB group, each of which comprises
`one or more SIBs, may be transmitted from a user terminal
`to a network node, as shown in block 102. In the exemplary 20
`embodiment, the one or more SIBs may be grouped or
`classified according to a feature of the one or more SIBs. It
`will be realized that the SI corresponding to the SIB men(cid:173)
`tioned here may comprise other SI than minimum SI in the
`context of NR. It is noted that the terms of "SI" and "SIB" 25
`used herein and the exemplary illustration of grouping of
`one or more SIBs are not limited to NR and LTE. The
`proposed methods, apparatus and related products herein
`may also be applicable to other suitable network environ(cid:173)
`ments, although some exemplary embodiments are 30
`described with respect to NR and LTE. As described previ(cid:173)
`ously, minimum SI corresponds to MIB, SIBl and SIB2 in
`LTE, and accordingly other SI corresponds to SIB3 until
`SIB21. The feature of the one or more SIBs may be learned
`from the SIB definition in LTE. For example, the feature of 35
`the one or more SIBs may comprise at least one of func(cid:173)
`tionality and periodicity of the SIBs. However, other suitable
`rules may also be expected to be applicable for learning
`more features of SIBs.
`Table 1 exemplarily shows the functional description of 40
`some SIBs in LTE. It can be seen from Table 1 that the SIBs
`carrying SI are not fully independent to each other. For
`example, SIB3 to SIB8 are all related to how to do cell
`reselection, although each SIB has different responsibility.
`Therefore, SIB3 to SIB8 can be grouped together. For SIBlO 45
`to SIB12, these SIBs are all related to warning and alert.
`Therefore, SIB 10 to SIB 12 can be group together. For SIB 18
`to SIB 19, the SIBs are both related to device-to-device
`(D2D) sidelink communication. Accordingly, SIB18 to
`SIB19 can be grouped together. The remaining SIBs can be 50
`grouped together. Thus, the SIBs listed in Table 1 may be
`classified into four groups.
`
`It can be seen that different SIBs and the SI thereof may
`be grouped according to their functionalities. Optionally, the
`SIBs may be classified into more or less groups than four
`groups. For example, since the transmission of SIBs related
`to warning and alert is triggered by the network instead of
`by a user terminal, the SI associated with SIBIO to SIB12
`does not need to be requested by the user terminal at all.
`Then in total there are three SIB groups to be requested.
`Other ways to group these SIBs are also possible. For
`example, the SIBs related to cell reselection may be classi(cid:173)
`fied into one group, while all others may be classified into
`another group.
`Another feature of SIBs which may be used to classify the
`SIBs is periodicity. For example, SIBs with the same or
`similar transmission periodicity may be grouped together.
`Use LTE SIB transmission periodicity as an example, where
`the SIBs each with periodicity of 80 ms, 160 ms, 320 ms,
`640 ms, 1280 ms, 2560 ms and 5120 ms may be classified
`into seven SIB groups. Alternatively, the SIBs may be
`classified into three SIB groups with the first group com(cid:173)
`prising SIBs with periodicities of 80 ms, 160 ms, the second
`group comprising SIBs with periodicities of320 ms, 640 ms,
`and the third group comprising SIBs with periodicities of
`1280 ms, 2560 ms, 5120 ms. It will be realized that one or
`more SIBs may be classified into the desired number of
`groups according to the periodicity of SIBs.
`In accordance with the exemplary method illustrated in
`FIG. 1, the transmission of the request for the at least one
`SIB group may comprise transmitting a preamble for indi(cid:173)
`cating the at least one SIB group.
`In an exemplary embodiment, the transmission of the
`request may comprise selecting, from a plurality of pre(cid:173)
`ambles, a preamble associated with the at least one SIB
`group; and transmitting the request to the network node. The
`request may include the selected preamble.
`In an exemplary embodiment, the at least one SIB group
`may be indicated by transmission timing of the preamble.
`Optionally, the transmission of the request may comprise
`transmitting the request to the network node in accordance
`with a selected transmission timing associated with the at
`least one SIB group.
`In an exemplary embodiment, the at least one SIB group
`may be associated with a preamble (also referred to as a
`sequence of the preamble or a preamble sequence for ease of
`description) or the selected transmission timing of the pre(cid:173)
`amble. Thus, the user terminal can selectively request the
`60 required SIB group from the network node.
`In an exemplary embodiment, selective requests for SIB
`groups may be transmitted from the user terminal by using
`different preamble sequences, which may be differentiated
`by indexes of the preambles. One preamble sequence may
`65 correspond to a predetermined combination of SIB groups.
`Take 3 preambles as an example. In alternative I, preambles
`1 to 3 may be used to indicate SIB groups 1 to 3, respec-
`
`55
`
`TABLE 1
`
`SIB
`
`Description
`
`SIB3
`
`SIB4
`
`SIB5
`
`SIB6
`SIB?
`SIB8
`
`Parameters required for intra-frequency, inter-frequency and
`I-RAT cell re-selections
`Information regarding INTRA-frequency neighboring cells
`(E-UTRA)
`Information regarding INTER-frequency neighboring cells
`(E-UTRA)
`Information for re-selection to INTER-RAT (UTRAN cells)
`Information for re-selection to INTER-RAT (GERAN cells)
`Information for re-selection to INTER-RAT (CDMA2000)
`
`SIBIO
`
`ETWS (Earthquake and Tsunami Warning System) information
`(Primary notification)
`
`Samsung Ex. 1001
`
`

`

`US 10,512,027 B2
`
`7
`tively, where SIB group 1 is related to cell reselection, SIB
`group 2 is related to sidelink communication, and SIB group
`3 comprises the remaining one or more SIBs. According to
`this alternative, a user terminal needing multiple SIB groups
`(for example, comprising SIB groups 1 and 2) may be
`required to send multiple SIB group requests (for example,
`comprising preambles 1 and 2) to a network node.
`It will be realized that the usage of multiple preambles can
`be in different ways. For example, in alternative II, pre(cid:173)
`ambles 1 to 3 may be used to indicate SIB group 1, SIB 10
`groups 1 +2, and SIB groups 1 +2+3, respectively. According
`to this alternative, a user terminal can always select a
`corresponding preamble to get all desired SIB groups.
`Compared to alternative I, alternative II may save the
`preamble resource/transmission but the probability to trans- 15
`mit the undesired SI is higher than alternative I.
`Thus, when SIB groups in the network are indicated by
`using different preambles, the user terminal can send the
`corresponding preamble to the network node if the user
`terminal wants to request SI from at least one of the SIB 20
`groups. When the network node detects such preamble, it
`can therefore only transmit or broadcast SI within the
`indicated SIB groups according to the detected preamble.
`In accordance with the exemplary method illustrated in
`FIG. 1, the user terminal may receive notification informa- 25
`tion transmitted from the network node. In this case, trans(cid:173)
`mission of the at least one SIB group may be predefined or
`derived based at least partly on the notification information.
`Optionally, the notification information may be included in
`minimum SI.
`In an exemplary embodiment, the notification information
`may indicate a correspondence between all of preambles and
`SIB groups. Optionally, the correspondence between the at
`least one SIB group and the associated preamble or the
`indication of the at least one SIB group by the preamble may
`be predefined or derived based at least partly on the notifi(cid:173)
`cation information from the network node. For example, the
`preambles which are used to request on-demand transmis(cid:173)
`sion of SI carried by one or more SIBs can be predefined
`according to a specified rule known by the user terminal and
`the network node.
`In an exemplary embodiment, if the correspondence
`between preambles and SIB groups is informed in minimum
`SI, the minimum SI can indicate only one preamble for one
`SIB group, while there is a specified rule for the user
`terminal to derive other preambles for other SIB groups. For
`example, it is assumed that the specified rule is that all the
`preambles for requesting SIB groups are with consecutive
`indexes, and each preamble with an index increased by one
`indicates one more SIB group. As such, for alternative II as
`mentioned previously, if it is informed in the minimum SI
`that a preamble with index 'n' is used to indicate SIB group
`1, then according to the specified rule, the user terminal may
`know that a preamble with index 'n+ 1' is used to indicate
`SIB groups 1+2, and a preamble with index 'n+2' is used to
`indicate SIB groups 1+2+3. It will be appreciated that other
`suitable rules also may be applicable to determine preambles
`for selective request and transmission of SI. For example,
`the preambles for requesting SIB groups may be with
`inconsecutive indexes, and/or the correspondence between 60
`all of preambles and SIB groups may be informed in the
`minimum SI from the network node.
`In another exemplary embodiment, selective requests for
`SIB groups may be transmitted from the user terminal by
`using different preamble timing. In this embodiment, only
`one preamble may be used to request SIB group transmis(cid:173)
`sion from the network node, but the timing at which the
`
`8
`preamble is sent can be utilized to determine which SIB
`group is requested. Therefore, compared with the embodi(cid:173)
`ment where different preambles are used to indicate multiple
`SIB groups, using different transmission timing of one
`preamble to indicate multiple SIB groups may save trans(cid:173)
`mission resources.
`Assuming there are three SIB groups, including SIB
`group A with periodicities of 80 ms, 160 ms, SIB group B
`with periodicities of 320 ms, 640 ms, and SIB group C with
`periodicities of 1280 ms, 2560 ms, 5120 ms. The respective
`minimum periodicities of SIB groups A, B and C are 80 ms,
`320 ms and 1280 ms, respectively. Then the timing at which
`a SIB group is requested by sending a preamble determines
`which SIB group is requested. In an exemplary embodiment,
`the requested SIB group may be determined according to
`whether the frame corresponding to the preamble sent by the
`user terminal has an integer multiple period of the minimum
`periodicity of the SIB group. As a further rule, if the period
`of that frame is an integer multiple of the minimum peri(cid:173)
`odicities of several SIB groups, then the SIB group with the
`largest periodicity ( or alternatively the SIB group with the
`smallest periodicity) may be determined as the requested
`SIB group. In another exemplary embodiment, the requested
`SIB group may be determined according to the frame
`corresponding to the preamble sent by the user terminal and
`the latest next frame in which SI can be transmitted or
`broadcasted. In this embodiment, the frame corresponding to
`the preamble may have a period which is not an integer
`multiple of the minimum periodicity of the SIB group.
`Use the LTE frame as an example, where the frame length
`is 10 ms. If the number of the frame corresponding to the
`preamble is 24, then the period of the frame is 240 ms, which
`is an integer multiple of the minimum periodicity 80 ms of
`SIB group A. This means that the user terminal wants to
`35 request SIB group A. Similarly, if the number of the frame
`corresponding to the preamble is 96, then the period of the
`frame is 960 ms, which is an integer multiple of the
`minimum periodicity 80 ms of SIB group A and the mini(cid:173)
`mum periodicit