Patent Description:
Further embodiments relate to a method of operating related to such apparatus.

Wireless communications systems may e.g. be used for wireless exchange of information between two or more entities such as a user equipment and a network, e.g. comprising at least one network node, e.g. a base station.

For initial access of user equipment to the network, the user equipment may be supplied with configuration information.

<NPL> discloses a network which configures a UE for both <NUM> step RACH and <NUM>-step RACH. The UE determines which RACH procedure to use based on different parameters, e.g. radio conditions.

Various embodiments of the disclosure are set out by the independent claims. The exemplary embodiments and features, if any, described in this specification, that do not fall under the scope of the independent claims, are to be interpreted as examples useful for understanding various exemplary embodiments of the disclosure.

Some embodiments relate to an apparatus, comprising at least one processor, and at least one memory storing instructions, the at least one memory and the instructions configured to, with the at least one processor, cause a base station to determine a first information which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station (e.g., the base station itself or a component such as e.g. a remote radio head), b) radio conditions experienced by a user equipment, and to determine, based on the first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment. In some embodiments, this enables to flexibly adapt the configuration based on e.g. the first information.

In some embodiments, the apparatus may be an apparatus for a wireless communications system.

In some embodiments, the apparatus or its functionality, respectively, may be provided in a network element of the communications systems, for example in a base station, e.g. a gNodeB (gNB).

In some embodiments, the apparatus according to the embodiments or its functionality, respectively, may be used for or within wireless communications systems, e.g. networks, based on or at least partially adhering to third generation partnership project, 3GPP, radio standards such as <NUM> (fifth generation) or other radio access technology.

In some embodiments, the instructions, when executed by the at least one processor, further cause the base station to determine the first information based on a setup request from the user equipment.

In some embodiments, the single phase configuration characterizes a configuration of the user equipment which can be performed in one stage, e.g. using one (e.g., single) message exchange with the user equipment.

In some embodiments, the multi-phase configuration characterizes a configuration of the user equipment which uses more than one stage, e.g. using two stages, e.g. using more than one message exchange with the user equipment.

In some embodiments, the instructions, when executed by the at least one processor, further cause the base station to individually determine the first information and/or whether to perform a single phase configuration or a multi-phase configuration for a specific user equipment, e.g. based on the setup request of the specific user equipment. In other words, according to some embodiments, the base station may provide for a UE-specific type of configuration (e.g., single-phase or multi-phase, e.g. two-phase), e.g. based on individual criteria such as the first information or characterized by the first information. In some embodiments, this enables to flexibly and dynamically (e.g., during operation of the base station) adapt the type of configuration for a (newly) accessing user equipment based on individual operating conditions of the respective user equipment.

In some embodiments, the individual operating conditions of a user equipment may comprise and/or characterize at least one of: a) position of the user equipment with respect to the base station and/or a component (e.g., remote radio head (RRH) or the like) of the base station (e.g., distance between the user equipment and the base station or at least one component of the base station such as an RRH), b) radio conditions experienced by the user equipment (e.g. characterized by a signal-to-noise ratio (SNR)), c) modulation and coding scheme (MCS).

In some embodiments, a timing advance (TA) value and/or an estimation of the TA value, e.g. based on a preamble transmitted by the user equipment to the base station in an uplink transmission during initial access, e.g. a random access channel (RACH) preamble, e.g. from a particular range, of the user equipment, may be used to determine a relative position of the user equipment with respect to the (component of) the base station and/or the distance between the user equipment and the (component of) the base station.

In some embodiments, a comparatively high sampling rate may be used for processing such (RACH) preamble of the user equipment, to increase a precision of the TA estimation.

In some embodiments, an estimated distance between the user equipment and the base station and/or a component (e.g., RRH) of the base station may, optionally together with a parameter characterizing radio conditions (e.g., SNR, RSRP, etc.), be employed to determine if the user equipment is closer to a base station (or RRH), e.g. a center of a radio cell as provided by the base station (or its RRH), or if it is further away, e.g. at a cell edge.

In some embodiments, the user equipment may be classified into one of at least two classes characterizing the distance between the position of the user equipment and the base station (or its RRH), and the first information may e.g. comprise and/or characterize (e.g., amongst others) this classification.

In some embodiments, the first information may comprise one bit, e.g. indicating whether the user equipment is associated with a first class comprising user equipment closer to a cell center than to a cell edge, or with a second class comprising user equipment closer to the cell edge than to the cell center of the radio cell. In some embodiments, the user equipment may determine its class based on the experienced RSRP in its location. In some embodiments, based on this first information, the base station may determine whether to perform a single-phase or multi-phase, e.g. two-phase, configuration for the user equipment.

In some embodiments, the instructions, when executed by the at least one processor, further cause the base station to a) determine to perform a single phase configuration for the user equipment if at least one of the following criteria is satisfied: aa) radio parameters indicative of a distance between the user equipment and the at least one component of the base station is below a first threshold, bb) the radio conditions (e.g., as may be characterized by the SNR and/or another suitable parameter) experienced by the user equipment exceed a second threshold, cc) a complexity of a target modulation and coding scheme associated with the user equipment exceeds a third threshold. In some embodiments, in these cases it may be concluded that a single-phase configuration of a specific user equipment may be more efficient than a multi-phase configuration.

In some embodiments, the instructions, when executed by the at least one processor, further cause the base station to a) determine to perform a multi-phase configuration, for example a two-phase configuration, for the user equipment if at least one of the following criteria is satisfied: aa) radio parameters indicative of a distance between the user equipment and the at least one component of the base station exceeds the first threshold, bb) the radio conditions experienced by the user equipment are below the second threshold, cc) a complexity of a target modulation and coding scheme associated with the user equipment is below the third threshold. In some embodiments, in these cases it may be concluded that a multi-phase, e.g. two-phase, configuration of a specific user equipment may be more efficient than a single-phase configuration.

In some embodiments, the instructions, when executed by the at least one processor, further cause the base station to perform the configuration for the user equipment based on the determination whether to perform a single phase configuration or a multi-phase configuration for the user equipment.

In some embodiments, the base station comprises a central unit and at least one distributed unit, wherein the instructions, when executed by the at least one processor, cause the at least one distributed unit to receive a setup request, e.g. connection setup request, from the user equipment, to determine the first information based on the setup request, e.g. connection setup request, and to transmit the first information to the central unit.

In some embodiments, the base station may be a base station for a <NUM> network, e.g. a gNB. In some embodiments, the gNB may e.g. be split, e.g. at least regarding its logical architecture, into a central unit (CU or gNB-CU) and at least one distributed unit (DU or gNB-DU). As an example, in some embodiments, the at least one DU may e.g. comprise or represent an RRH.

In some embodiments, the setup request from the user equipment may be a setup request, e.g. connection setup request, according to some accepted specification, e.g. a Radio Resource Control (RRC) setup request.

In some embodiments, the distributed unit may use an interface according to some accepted specification, e.g. an F1 interface, for transmitting the first information to the central unit.

In some embodiments, the distributed unit may use a protocol according to some accepted specification, e.g. an F1 Application Protocol (F1AP), for transmitting the first information to the central unit.

In some embodiments, the base station comprises a central unit and at least one distributed unit, wherein the instructions, when executed by the at least one processor, cause the at least one distributed unit to receive a setup request (e.g., RRC setup request) from the user equipment and to signal (e.g., over the F1 interface and/or using e.g. the F1AP) to the central unit whether to perform a single phase configuration or a multi-phase configuration for the user equipment based on the setup request.

In some embodiments, the instructions, when executed by the at least one processor, further cause the central unit to receive the first information from the at least one distributed unit, and to determine, based on the received first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment.

In some embodiments, e.g. when the gNB-DU receives an RRC setup request message from a user equipment, the gNB-DU may detect a radio condition experienced by the user equipment and may e.g. signal assistance information, e.g. based on the detected radio condition, to the gNB-CU, e.g. a gNB-CU-Control Plane (gNB-CU-CP). In some embodiments, the assistance information may comprise and/or characterize the first information according to the embodiments.

In other words, in some embodiments, the gNB-DU may share the first information, e.g. assistance information, with the gNB-CU, e.g. with the gNB-CU-CP, e.g. over the F1 interface.

In some embodiments, the gNB-DU may signal to the gNB-CU, e.g. to the gNB-CU-CP, to use a one-phase configuration for the user equipment. In some embodiments, after receipt of this signaling, the gNB may use the one-phase configuration for the user equipment, e.g. encoding and signaling a corresponding setup message to the user equipment, e.g. an RRC SETUP message.

In some embodiments, the gNB-DU may signal to the gNB-CU, e.g. to the gNB-CU-CP, to use a multi-phase, e.g. two-phase, configuration for the user equipment. In some embodiments, after receipt of this signaling, the gNB may use the multi-phase, e.g. two-phase, configuration for the user equipment, e.g. encoding and signaling a corresponding setup message and at least one further message to the user equipment, e.g. an RRC SETUP message and an RRC Reconfiguration message.

In some embodiments, an accepted specification, e.g. the FLAP specification, may be enhanced, e.g. to introduce the first information, e.g. assistance information, e.g. in the form of one or more additional, e.g. optional, information elements (IEs).

In some embodiments, e.g. for a one-phase configuration, a legacy IE may be used, e.g. a CellGroupConfig IE.

In some embodiments, one or more new, e.g. additional, IEs may be included in an F1 message, e.g. in an F1: "INITIAL UL RRC MESSAGE TRANSFER" message, e.g. according to 3GPP TS <NUM> (see for example 3GPP TS <NUM>, version <NUM>. <NUM> Release <NUM> chapter <NUM>. In some embodiments, the additional information elements may e.g. comprise:.

In some embodiments at least some of the above listed additional IEs a), b), c) may e.g. be included in the F1: INITIAL UL RRC MESSAGE TRANSFER message.

In some embodiments at least some of the above listed additional IEs a), b), c) may be optional.

In some embodiments at least one of the above listed additional IEs a), b), c) may be included (e.g. in the INITIAL UL RRC MESSAGE TRANSFER message), e.g. transmitted to the gNB-CU, if the gNB-DU determines to use multi-phase, e.g. two-phase, configuration.

In some embodiments the above listed additional IEs a), b) may comprise the type "OCTET STRING". In some embodiments the above listed additional IE c) may comprise the type "ENUMERATED {split}".

In some embodiments at least one of the above listed additional IEs a), b), c) may comprise a Criticality of type "Yes" and/or an Assigned Criticality of type "reject".

In some embodiments, the functionality of the apparatus according to the embodiments may be, at least logically, split, and may e.g. be associated with a gNB-CU and/or the at least one gNB-DU.

Further embodiments relate to an apparatus, comprising at least one processor, and at least one memory storing instructions, the at least one memory and the instructions configured to, with the at least one processor, cause a central unit of a base station, e.g. gNB-CU, e.g. gNB-CU-CP, to receive a first information, which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, from at least one distributed unit of the base station, and to determine, based on the received first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment.

Further embodiments relate to an apparatus, comprising at least one processor, and at least one memory storing instructions, the at least one memory and the instructions configured to, with the at least one processor, cause at least one distributed unit of a base station, e.g. gNB-DU, to receive a setup request from a user equipment establishing access to the base station, to determine a first information, which characterizes at least one of a) a position of the user equipment relative to at least one component of the base station, b) radio conditions experienced by the user equipment, based on the setup request, and to transmit the first information to a central unit of the base station, e.g. gNB-CU, e.g. gNB-CU-CP.

Further embodiments relate to a method comprising: determining, by a base station, e.g. gNB, e.g. gNB-DU and/or gNB-CU, a first information which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, and determining, based on the first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment.

Further embodiments relate to a method comprising: receiving, by a central unit of a base station, e.g. gNB-CU, e.g. gNB-CU-CP, a first information, which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, from at least one distributed unit of the base station, and determining, based on the received first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment.

Further embodiments relate to a method comprising: receiving, by at least one distributed unit of a base station, e.g. gNB-DU, a setup request from a user equipment establishing access to the base station, e.g. gNB, determining, by the at least one distributed unit, a first information, which characterizes at least one of a) a position of the user equipment relative to at least one component of the base station, b) radio conditions experienced by the user equipment, based on the setup request, and transmitting, by the at least one distributed unit, the first information to a central unit, e.g. gNB-CU, e.g. gNB-CP, of the base station.

Further embodiments relate to an apparatus comprising means for causing a base station, e.g. gNB, e.g. gNB-DU and/or gNB-CU, e.g. gNB-CU-CP, to determine a first information which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, and to determine, based on the first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment.

In some embodiments, the means for causing the base station to perform the steps of determining the first information and/or to determine, based on the first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment, may e.g. comprise at least one processor, and at least one memory storing instructions, the at least one memory and the instructions configured to, with the at least one processor, perform said steps.

Further embodiments relate to a wireless communications system comprising at least one base station and at least one apparatus according to the embodiments.

Some embodiments relate to an apparatus, e.g. for a base station <NUM> (<FIG>) of a wireless communications system <NUM>. <FIG> schematically depicts a simplified block diagram of the apparatus <NUM> according to some embodiments, and <FIG> schematically depicts a simplified flow chart of a method of operating the apparatus <NUM> according to some embodiments.

The apparatus <NUM> (<FIG>) comprises at least one processor <NUM>, and at least one memory <NUM> storing instructions <NUM>, the at least one memory <NUM> and the instructions <NUM> configured to, with the at least one processor <NUM>, cause a base station <NUM> to determine <NUM> (<FIG>) a first information I-<NUM> which characterizes at least one of a) a position of a user equipment <NUM> (<FIG>) establishing access A-<NUM> to the base station <NUM> relative to at least one component of the base station <NUM>, b) radio conditions experienced by a user equipment <NUM>, and to determine <NUM> (<FIG>), based on the first information I-<NUM>, whether to perform a single phase configuration or a multi-phase configuration for the user equipment <NUM>. In some embodiments, this enables to flexibly adapt the configuration for the user equipment <NUM> based on e.g. the first information I-<NUM>.

In some embodiments, the apparatus <NUM> (<FIG>) may be an apparatus for a wireless communications system <NUM>.

In some embodiments, the apparatus <NUM> or its functionality, respectively, may be provided in a network element of the communications systems, for example in a the base station <NUM>, e.g. a gNodeB (gNB) <NUM>.

In some embodiments, the apparatus <NUM> according to the embodiments or its functionality, respectively, may be used for or within wireless communications systems <NUM>, e.g. networks, based on or at least partially adhering to third generation partnership project, 3GPP, radio standards such as <NUM> (fifth generation) or other radio access technology.

In some embodiments, the instructions <NUM> (<FIG>), when executed by the at least one processor <NUM>, further cause the base station <NUM> to determine <NUM> the first information I-<NUM> based on a setup request, e.g. connection setup request, SETUP-REQ (<FIG>, <FIG>) from the user equipment.

In some embodiments, the instructions <NUM>, when executed by the at least one processor <NUM>, further cause the base station <NUM> to individually determine the first information I-<NUM> and/or whether to perform a single phase configuration or a multi-phase configuration for a specific user equipment <NUM>, e.g. based on the connection setup request SETUP-REQ of the specific user equipment <NUM>. In other words, according to some embodiments, the base station <NUM> may provide for a UE-specific type of configuration (e.g., single-phase or multi-phase, e.g. two-phase), e.g. based on individual criteria such as the first information I-<NUM> or characterized by the first information I-<NUM>. In some embodiments, this enables to flexibly and dynamically (e.g., during operation of the base station <NUM>) adapt the type of configuration for a (newly) accessing user equipment <NUM> based on individual operating conditions of the respective user equipment <NUM>.

In some embodiments, the individual operating conditions of a user equipment <NUM> (<FIG>) may comprise and/or characterize at least one of: a) position of the user equipment <NUM> with respect to the base station <NUM> and/or a component (e.g., remote radio head (RRH) or the like) of the base station <NUM> (e.g., distance d between the user equipment <NUM> and the base station <NUM> or at least one component of the base station such as an RRH), b) radio conditions experienced by the user equipment <NUM> (e.g. characterized by a signal-to-noise ratio (SNR)), c) modulation and coding scheme (MCS).

In some embodiments, a timing advance (TA) value and/or an estimation of the TA value, e.g. based on a preamble transmitted by the user equipment <NUM> to the base station <NUM> in an uplink transmission during initial access A-<NUM>, e.g. a random access channel (RACH) preamble value belonging to a particular range, of the user equipment <NUM>, may be used to determine a relative position of the user equipment <NUM> with respect to the (component of) the base station <NUM> and/or other radio parameters which are indicative of the distance d between the user equipment <NUM> and the (component of) the base station <NUM>.

In some embodiments, a comparatively high sampling rate may be used for processing such (RACH) preamble of the user equipment <NUM>, to increase a precision of the TA estimation. In some embodiments, an estimated distance d between the user equipment <NUM> and the base station <NUM> and/or a component (e.g., RRH) of the base station <NUM> may, optionally together with a parameter characterizing radio conditions (e.g., SNR, RSRP (Reference Signal Received Power), etc.), be employed to determine if the user equipment <NUM> is closer to a base station (or RRH), e.g. a center of a radio cell (not shown) as provided by the base station <NUM> (or its RRH), or if it is further away, e.g. at a cell edge.

In some embodiments, the user equipment <NUM> may be classified into one of at least two classes characterizing the distance d between the position of the user equipment <NUM> and the base station <NUM> (or its RRH), and the first information I-<NUM> may e.g. comprise and/or characterize (e.g., amongst others) this classification.

In some embodiments, the first information I-<NUM> may comprise (e.g., only) one bit, e.g. indicating whether the user equipment <NUM> is associated with a first class comprising user equipment closer to a cell center than to a cell edge, or with a second class comprising user equipment closer to the cell edge than to the cell center of the radio cell. In some embodiments, the user equipment <NUM> may determine the class it belongs to, based on the experienced RSRP threshold in the given location. In some embodiments, based on this first information, the base station <NUM> may determine whether to perform a single-phase or multi-phase, e.g. two-phase, configuration for the user equipment <NUM>.

In some embodiments, the instructions <NUM>, when executed by the at least one processor <NUM>, further cause the base station <NUM> to a) determine 302a (<FIG>) to perform a single-phase configuration for the user equipment <NUM> if at least one of the following criteria is satisfied: aa) a distance d between the user equipment <NUM> and the at least one component of the base station <NUM> is below a first threshold, bb) the radio conditions (e.g., as may be characterized by the SNR and/or another suitable parameter) experienced by the user equipment <NUM> exceed a second threshold, cc) a complexity of a target modulation and coding scheme associated with the user equipment <NUM> exceeds a third threshold. In some embodiments, in these cases it may be concluded that a single-phase configuration of a specific user equipment <NUM> may be more efficient than a multi-phase configuration.

In some embodiments, the instructions <NUM>, when executed by the at least one processor <NUM>, further cause the base station <NUM> to a) determine 302b to perform a multi-phase configuration, for example a two-phase configuration, for the user equipment <NUM> if at least one of the following criteria is satisfied: aa) the distance d between the user equipment <NUM> and the at least one component of the base station <NUM> exceeds the first threshold, bb) the radio conditions experienced by the user equipment <NUM> are below the second threshold, cc) a complexity of a target modulation and coding scheme associated with the user equipment <NUM> is below the third threshold. In some embodiments, in these cases it may be concluded that a multi-phase, e.g. two-phase, configuration of a specific user equipment <NUM> may be more efficient than a single-phase configuration.

In some embodiments, the instructions <NUM>, when executed by the at least one processor <NUM>, further cause the base station <NUM> to perform <NUM> (<FIG>) the configuration for the user equipment <NUM> based on the determination <NUM> whether to perform a single phase configuration or a multi-phase configuration for the user equipment <NUM>.

In some embodiments, see for example <FIG>, the base station <NUM>' comprises a central unit 12a and at least one distributed unit 12b, wherein the instructions <NUM> (<FIG>), when executed by the at least one processor <NUM>, cause the at least one distributed unit 12b to receive <NUM> (<FIG>) a setup request SETUP-REQ from the user equipment <NUM>, to determine <NUM> the first information I-<NUM> based on the setup request SETUP-REQ, and to transmit <NUM> the first information I-<NUM> to the central unit 12a.

In some embodiments, the base station <NUM>' may be a base station for a <NUM> network, e.g. a gNB <NUM>'. In some embodiments, the gNB <NUM>' may e.g. be split, e.g. at least regarding its logical architecture, into a central unit (CU or gNB-CU) 12a and at least one distributed unit (DU or gNB-DU) 12b. As an example, in some embodiments, the at least one DU 12b may e.g. comprise or represent an RRH.

In some embodiments, the connection setup request SETUP-REQ from the user equipment <NUM> may be a connection setup request SETUP-REQ according to some accepted specification, e.g. a Radio Resource Control (RRC) setup request.

In some embodiments, the distributed unit 12b may use an interface IF according to some accepted specification, e.g. an F1 interface, for transmitting the first information I-<NUM> to the central unit 12a.

In some embodiments, the distributed unit 12b may use a protocol according to some accepted specification, e.g. an F1 Application Protocol (F1AP), for transmitting the first information I-<NUM> to the central unit 12a.

In some embodiments, the instructions <NUM> (<FIG>), when executed by the at least one processor <NUM>, cause the at least one distributed unit 12b to receive, <FIG>, a setup request SETUP-REQ (e.g., RRC setup request) from the user equipment <NUM> and to signal <NUM> (e.g., over the F1 interface IF and/or using e.g. the F1AP) to the central unit 12a whether to perform a single phase configuration or a multi-phase configuration for the user equipment based on the setup request SETUP-REQ.

Optionally, in some embodiments, the distributed unit 12b may determine <NUM> the first information I-<NUM>, e.g. based on the received setup request SETUP-REQ. Optionally, in some embodiments, the distributed unit 12b may perform the signaling <NUM> based on the first information I-<NUM>. In some embodiments, the signaling may comprise the first information I-<NUM>.

In some embodiments, <FIG>, the instructions <NUM>, when executed by the at least one processor <NUM>, further cause the central unit 12a (<FIG>) to receive <NUM> (<FIG>) the first information I-<NUM> (and/or the signaling) from the at least one distributed unit 12b, and to determine <NUM>, based on the received first information I-<NUM> (and/or based on the signaling), whether to perform <NUM> a single phase configuration or a multi-phase configuration for the user equipment <NUM>.

In some embodiments, e.g. when the distributed unit 12b (e.g., gNB-DU 12b) receives an RRC setup request message SETUP-REQ from a user equipment <NUM>, the gNB-DU 12b may detect a radio condition experienced by the user equipment <NUM> and may e.g. signal assistance information, e.g. based on the detected radio condition, to the central unit 12a, e.g. gNB-CU, e.g. a gNB-CU-Control Plane (gNB-CU-CP). In some embodiments, the assistance information may comprise and/or characterize the first information I-<NUM> according to the embodiments.

In other words, in some embodiments, the gNB-DU 12b may share the first information I-<NUM>, e.g. assistance information, with the gNB-CU 12a, e.g. with the gNB-CU-CP, e.g. over the F1 interface IF.

In some embodiments, the gNB-DU 12b may signal (see e.g. block <NUM> of <FIG>) to the gNB-CU 12a, e.g. to the gNB-CU-CP, to use a one-phase configuration for the user equipment. In some embodiments, after receipt of this signaling, the gNB may use the one-phase configuration for the user equipment <NUM>, e.g. encoding and signaling a corresponding setup message to the user equipment <NUM>, e.g. an RRC SETUP message.

In some embodiments, the gNB-DU 12b may signal <NUM> to the gNB-CU 12a, e.g. to the gNB-CU-CP, to use a multi-phase, e.g. two-phase, configuration for the user equipment <NUM>. In some embodiments, after receipt of this signaling, the gNB may use the multi-phase, e.g. two-phase, configuration for the user equipment <NUM>, e.g. encoding and signaling a corresponding setup message and at least one further message to the user equipment, e.g. an RRC SETUP message and an RRC Reconfiguration message.

In some embodiments, an accepted specification, e.g. the FLAP specification, may be enhanced, e.g. to introduce the first information I-<NUM>, e.g. assistance information, e.g. in the form of one or more additional, e.g. optional, information elements (IEs).

In some embodiments at least one of the above listed additional IEs a), b), c) may be included (e.g. in the INITIAL UL RRC MESSAGE TRANSFER message), e.g. transmitted to the gNB-CU 12a, if the gNB-DU 12b determines to use multi-phase, e.g. two-phase, configuration.

In some embodiments, the functionality of the apparatus <NUM> (<FIG>) according to the embodiments may be, at least logically, split, see for example the blocks <NUM> of <FIG> exemplarily assigned to the CU 12a and the DU 12b, and may e.g. be associated with a gNB-CU 12a and/or the at least one gNB-DU 12b.

In some embodiments, the functionality of the apparatus <NUM> (<FIG>) according to the embodiments may be implemented by different apparatus 100a, 100b (<FIG>) as explained hereinafter, wherein the apparatus 100a may e.g. be associated with the gNB-CU 12a (<FIG>), and wherein the apparatus 100b may e.g. be associated with the gNB-DU 12b.

Further embodiments relate to an apparatus 100a (<FIG>), comprising at least one processor 102a, and at least one memory 104a storing instructions 106a, the at least one memory 104a and the instructions 106a configured to, with the at least one processor 102a, cause a central unit 12a of a base station, e.g. gNB-CU, e.g. gNB-CU-CP, to receive <NUM> (<FIG>) a first information I-<NUM>, which characterizes at least one of a) a position of a user equipment <NUM> establishing access to the base station <NUM>, <NUM>' relative to at least one component 12b of the base station (e.g., characterizing a distance d' between the user equipment <NUM> and the gNB-DU 12b), b) radio conditions experienced by the user equipment <NUM>, from at least one distributed unit 12b of the base station <NUM>', and to determine <NUM>, based on the received first information I-<NUM> (and/or a corresponding signaling), whether to perform <NUM> a single phase configuration or a multi-phase configuration for the user equipment <NUM>.

In some embodiments, the apparatus 100a is further configured to cause the gNB <NUM>, <NUM>' to perform further aspects of a method according to the embodiments explained above associated with the gNB-CU 12a.

Further embodiments, <FIG>, relate to an apparatus 100b, comprising at least one processor 102b, and at least one memory 104b storing instructions 106b, the at least one memory 104b and the instructions 106b configured to, with the at least one processor 102b, cause at least one distributed unit 12b (<FIG>) of a base station <NUM>', e.g. gNB-DU, to receive <NUM> (<FIG>) a setup request SETUP-REQ from a user equipment <NUM> establishing access to the base station <NUM>', to determine <NUM> a first information I-<NUM>, which characterizes at least one of a) a position of the user equipment relative to at least one component of the base station, b) radio conditions experienced by the user equipment, based on the setup request SETUP-REQ, and to transmit <NUM> the first information I-<NUM> to a central unit 12a of the base station, e.g. gNB-CU, e.g. gNB-CU-CP.

In some embodiments, alternatively or additionally to determining <NUM> the first information I-<NUM>, the gNB-DU 12b may determine whether the gNB <NUM>' should perform a single-phase configuration or a multi-phase configuration for the user equipment <NUM>, and may signal a result of this determination <NUM> to the gNB-CU 12a, e.g. within block <NUM>.

In some embodiments, such signaling may be performed implicitly or explicitly, e.g. by including one or more information elements into a message to be transmitted to the gNB-CU 12a, e.g. at least one of the exemplarily disclosed IEs a) "CellGroupConfig-MinConfig", b) "CellGroupConfig-Remaining", c) "ConfigOptionIndication".

Further embodiments, <FIG>, relate to a method comprising: determining <NUM>, by a base station <NUM>, <NUM>', e.g. gNB, e.g. gNB-DU and/or gNB-CU, a first information I-<NUM> which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, and determining <NUM>, based on the first information I-<NUM>, whether to perform a single phase configuration or a multi-phase configuration for the user equipment <NUM>.

Further embodiments, <FIG>, relate to a method comprising: receiving <NUM>, by a central unit 12a of a base station <NUM>, <NUM>', e.g. gNB-CU, e.g. gNB-CU-CP, a first information I-<NUM>, which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, from at least one distributed unit 12b of the base station <NUM>, <NUM>', and determining <NUM>, based on the received first information I-<NUM>, whether to perform <NUM> a single phase configuration or a multi-phase configuration for the user equipment.

Further embodiments, <FIG>, relate to a method comprising: receiving <NUM>, by at least one distributed unit, e.g. gNB-DU, 12b of a base station <NUM>, <NUM>' a setup request SETUP-REQ from a user equipment <NUM> establishing access to the base station, e.g. gNB, determining <NUM>, by the at least one distributed unit 12b, a first information I-<NUM>, which characterizes at least one of a) a position of the user equipment relative to at least one component of the base station, b) radio conditions experienced by the user equipment, based on the setup request SETUP-REQ, and transmitting <NUM>, by the at least one distributed unit 12b, the first information I-<NUM> to a central unit 12a, e.g. gNB-CU, e.g. gNB-CP, of the base station.

<FIG> schematically depicts a simplified flow chart according to some embodiments, which exemplarily depicts a one (i.e., single)-phase and two-phase (re)configuration process as alternatives within respective blocks B1 (one-phase), B2 (two-phase).

The elements 12b, <NUM> of <FIG> correspond with the elements 12b, <NUM> as exemplarily explained above with respect e.g. to <FIG>. Element 12a' of <FIG> symbolizes a gNB-CU-CP, and element <NUM> of <FIG> symbolizes an Access and Mobility Management Function (AMF).

Element e1 symbolizes an RRC setup request message transmitted from the user equipment <NUM> to the gNB-DU 12b, e.g. in the course of an initial access A-<NUM> to the network <NUM> (<FIG>) according to some embodiments. Element e2 symbolizes an initial uplink RRC message transfer, e.g. using the FLAP, via the F1 interface IF (<FIG>), from the gNB-DU 12b to the gNB-CU-CP 12a'.

For the exemplary one-phase configuration according to block B1 of <FIG>, element e3 symbolizes a downlink RRC message transfer from the gNB-CU-CP 12a' to the gNB-DU 12b. Element e4 symbolizes an RRC setup message, element e5 symbolizes an RRC setup complete message, element e6 symbolizes an INITIAL UL RRC MESSAGE TRANSFER from the gNB-DU 12b to the gNB-CU-CP 12a', and element e7 symbolizes an initial user equipment message, e.g. according to a next generation application protocol, NGAP, to the AMF <NUM>.

In some embodiments, a one stage message exchange with the user equipment <NUM> characterizing the single phase configuration comprises e.g. the elements e4, e5, as seen from the gNB-DU's perspective.

For the exemplary two-phase configuration according to block B2 of <FIG>, element e8 symbolizes a downlink (DL) RRC message transfer from the gNB-CU-CP 12a' to the gNB-DU 12b. Element e9 symbolizes an RRC setup message, element e10 symbolizes an RRC setup complete message, element e11 symbolizes an INITIAL UL RRC MESSAGE TRANSFER from the gNB-DU 12b to the gNB-CU-CP 12a'. Element e12 symbolizes a further DL RRC message transfer from the gNB-CU-CP 12a' to the gNB-DU 12b, element e13 symbolizes an RRC reconfiguration message, element e14 symbolizes an RRC configuration complete message, element e15 symbolizes a further INITIAL UL RRC MESSAGE TRANSFER from the gNB-DU 12b to the gNB-CU-CP 12a', and element e16 symbolizes an initial user equipment message, e.g. according to a the NGAP, to the AMF <NUM>.

In some embodiments, a two stage message exchange with the user equipment <NUM> characterizing the multi-, e.g. two-phase configuration, comprises e.g. the elements e9, e10 and e13, e14, as seen from the gNB-DU's perspective.

As can be seen from <FIG>, in some embodiments, a conventional F1: UE Context Modification Procedure message, which may e.g. be initiated by a conventional gNB-DU in case of a two-phase configuration, is not used according to the embodiments.

Further embodiments, <FIG>, relate to an apparatus <NUM>' comprising means <NUM>' for causing a base station <NUM>, <NUM>', e.g. gNB, e.g. gNB-DU and/or gNB-CU, e.g. gNB-CU-CP, to determine a first information I-<NUM> which characterizes at least one of a) a position of a user equipment establishing access to the base station relative to at least one component of the base station, b) radio conditions experienced by the user equipment, and to determine, based on the first information I-<NUM>, whether to perform a single phase configuration or a multi-phase configuration for the user equipment <NUM>.

In some embodiments, the means <NUM>' for causing the base station <NUM>, <NUM>' to perform the steps of determining the first information and/or to determine, based on the first information, whether to perform a single phase configuration or a multi-phase configuration for the user equipment, may e.g. comprise at least one processor <NUM> (<FIG>), and at least one memory <NUM> storing instructions <NUM>, the at least one memory <NUM> and the instructions <NUM> configured to, with the at least one processor <NUM>, perform said steps.

Further embodiments relate to a wireless communications system <NUM> (<FIG>) comprising at least one base station <NUM>, <NUM>' and at least one apparatus <NUM>, 100a, 100b, <NUM>' according to the embodiments.

Claim 1:
An apparatus (<NUM>), comprising at least one processor (<NUM>), and at least one memory (<NUM>) storing instructions (<NUM>), the at least one memory (<NUM>) and the instructions (<NUM>) configured to, with the at least one processor (<NUM>), cause a base station (<NUM>; <NUM>') to determine (<NUM>) a first information (I-<NUM>) which characterizes at least one of a) a position of a user equipment (<NUM>) establishing access (A-<NUM>) to the base station (<NUM>; <NUM>') relative to at least one component (<NUM>; 12b) of the base station (<NUM>; <NUM>'), b) radio conditions experienced by a user equipment (<NUM>), and to determine (<NUM>), based on the first information (I-<NUM>), whether to perform (<NUM>) a single phase configuration or a multi-phase configuration for the user equipment (<NUM>).