WO2020030283A1 - Secondary uplink mode selection optimization - Google Patents

Secondary uplink mode selection optimization Download PDF

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Publication number
WO2020030283A1
WO2020030283A1 PCT/EP2018/071768 EP2018071768W WO2020030283A1 WO 2020030283 A1 WO2020030283 A1 WO 2020030283A1 EP 2018071768 W EP2018071768 W EP 2018071768W WO 2020030283 A1 WO2020030283 A1 WO 2020030283A1
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Prior art keywords
uplink
base station
random access
frequency
access attempt
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PCT/EP2018/071768
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French (fr)
Inventor
Muhammad NASEER-UL-ISLAM
Guillaume DECARREAU
Irina-Mihaela BALAN
Benedek SCHULTZ
Stephen MWANJE
Andreas Lobinger
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Nokia Technologies Oy
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Priority to PCT/EP2018/071768 priority Critical patent/WO2020030283A1/en
Publication of WO2020030283A1 publication Critical patent/WO2020030283A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/08Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Abstract

The present invention provides apparatuses, methods, computer programs, computer program products and computer-readable media regarding secondary uplink mode selection optimization. The apparatus measuring, at a user equipment served by a first base station, a measurement value in downlink to the first base station, if it is determined that the measurement value is larger than a threshold, making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink, if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful, making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.

Description

DESCRIPTION
SECONDARY UPLINK MODE SELECTION OPTIMIZATION
Technical Field
Various example embodiments relate to apparatuses, methods, systems, computer programs, computer program products and computer-readable media regarding secondary uplink mode selection optimization.
Abbreviations and Definitions:
3GPP 3rd Generation Partnership Project
DL Downlink
gNB Next generation NodeB
MAC Medium Access Control
NR New Radio
NUL Normal Uplink
RA Random Access
RRC Radio Resource Control
RSRP Reference Signal Received Power
SUL Secondary Uplink
UE User Equipment
UL Uplink
Background
The invention relates to the Secondary Uplink (SUL) operation in, e.g ., 5G and its optimization.
Summary It is an object of various example embodiments to provide apparatuses, methods, systems, computer programs, computer program products and computer-readable media regarding secondary uplink mode selection optimization.
According to an aspect of various example embodiments there is provided a method comprising :
According to another aspect of various example embodiments there is provided a method comprising :
measuring, at a user equipment served by a first base station, a measurement value in downlink to the first base station,
if it is determined that the measurement value is larger than a threshold, making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink,
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
According to an aspect of various example embodiments there is provided a method comprising :
receiving, at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station,
analyzing the information for detecting a root cause of the failed random access attempt, and
modifying at least one of the parameters based on the analysis.
According to another aspect of various example embodiments there is provided an apparatus comprising :
at least one processor, and
at least one memory for storing instructions to be executed by the processor, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus at least to perform :
measuring, at the user equipment served by a first base station, a measurement value in downlink to the first base station,
if it is determined that the measurement value is larger than a threshold, making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink,
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
According to an aspect of various example embodiments there is provided an apparatus comprising :
at least one processor, and
at least one memory for storing instructions to be executed by the processor, wherein
the at least one memory and the instructions are configured to, with the at least one processor, cause the base station apparatus at least to perform:
receiving, at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station,
analyzing the information for detecting a root cause of the failed random access attempt, and
modifying at least one of the parameters based on the analysis.
According to an aspect of various example embodiments there is provided an apparatus comprising :
means for measuring, at a user equipment served by a first base station, a measurement value in downlink to the first base station,
if it is determined that the measurement value is larger than a threshold, means for making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink, if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
means for making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
According to an aspect of various example embodiments there is provided an apparatus comprising :
means for receiving, at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station,
means for analyzing the information for detecting a root cause of the failed random access attempt, and
means for modifying at least one of the parameters based on the analysis.
According to another aspect of the present invention there is provided a computer program product comprising code means adapted to produce steps of any of the methods as described above when loaded into the memory of a computer.
According to a still further aspect of the invention there is provided a computer program product as defined above, wherein the computer program product comprises a computer-readable medium on which the software code portions are stored.
According to a still further aspect of the invention there is provided a computer program product as defined above, wherein the program is directly loadable into an internal memory of the processing device.
According to an aspect of various example embodiments there is provided a computer readable medium storing a computer program as set out above.
Further aspects and features of the present invention are set out in the dependent claims. Brief Description of the Drawings
These and other objects, features, details and advantages will become more fully apparent from the following detailed description of various aspects/embodiments which is to be taken in conjunction with the appended drawings, in which :
Fig. 1 is a diagram illustrating an example of cell coverage with SUL configuration, to which certain embodiments of the present invention are applicable.
Fig. 2 is a signaling diagram illustrating a scenario with successful RA attempt on SUL after failure of NUL according to certain embodiments of the present invention.
Fig. 3 a signaling diagram illustrating a scenario with unsuccessful RA attempts on both SUL and NUL carriers of original serving cell according to certain embodiments of the present invention.
Fig. 4 is a flowchart illustrating an example of a method according to certain aspects of the present invention.
Fig. 5 is a flowchart illustrating another example of a method according to certain aspects of the present invention.
Fig. 6 is a block diagram illustrating an example of an apparatus according to certain aspects of the present invention.
Detailed Description
The present disclosure is described herein with reference to particular non-limiting examples and to what are presently considered to be conceivable embodiments. A person skilled in the art will appreciate that the present disclosure is by no means limited to these examples and embodiments, and may be more broadly applied.
In the following, some example versions of the disclosure and embodiments are described with reference to the drawings. For illustrating the various embodiments, the examples and embodiments will be described in connection with a cellular communication network based on a 3GPP based communication system, for example, a 5G/NR system or the like. As such, the description of example embodiments given herein specifically refers to terminology which is directly related thereto. Such terminology is only used in the context of the presented non- limiting examples and embodiments, and does naturally not limit the present disclosure in any way. Rather, any other system configuration or deployment may equally be utilized as long as complying with what is described herein and/or example embodiments described herein are applicable to it. Further, it is to be noted that the various embodiments are not limited to an application using such types of communication systems or communication networks, but is also applicable in other types of communication systems or communication networks.
The feature of Secondary Uplink (SUL) has been introduced in 5G to enhance the UL coverage. UL coverage is usually more limited compared to DL due to smaller transmit power at UEs. In case of SUL, a UE can be configured with two ULs for one DL in the same cell (cf. 3GPP TS 38.300). To enable a wider coverage area of the SUL compared to the Normal Uplink (NUL), the SUL carriers are planned to be in the lower spectrum bands like 800 MHz.
To help the UE choose between the NUL and SUL, some parameters have also been introduced, as given below. For cell selection, SUL specific information has been added to the Cell Selection Criterion, as described in 3GPP TS 38.304, which is cited in the following (SUL related fields are underlined) :
5.2.3.2 Cell Selection Criterion
The cell selection criterion S in normal coverage is fulfilled when :
Srxlev > 0 AND Squal > 0
where:
SrxleV = Qrxlevmeas (Qrxlevmin + Qrxlevminoffset ) Pcompensation QoffSettemp
Sq ua l = Qqualmeas (Qqualmin + Qqualminoffset) QoffSettemp
where:
Figure imgf000008_0002
The following shows part of the RACH-ConfigCommon information element as described in 3GPP TS 38.331, section 6.3.2 for random access configuration and SUL.
The RACH-ConfigCommon IE is used to specify the cell specific random-access parameters (SUL related fields are underlined).
RACH-ConfigCommon information element
— ASNlSTART
— TAG-RACH-CONFIG-COMMON-START
RACH-ConfigCommon SEQUENCE {
FFS: whether any of the parameter(s) in the Ll TP should be within CBRA-SSB-
ResourceList
groupBconfigured SEQUENCE {
— FFS : ra-Msg3SizeGroupA values
ra-Msg3SizeGroupA ENUMERATED {b56, bl44, b208, b256 b282, b480, b640, b800, blOOO, spare7, spare6, spare5,
spare4 spare3, spare2, sparel},
— FFS: Need and definition of messagePowerOffsetGroupB
messagePowerOffsetGroupB ENUMERATED { minusinfinity, dBO, dB5, dB8, dBlO, dBl2, dBl5 , dBl8}
} OPTIONAL,
cbra-SSB-ResourceList CBRA-SSB-ResourceList,
Figure imgf000008_0001
— Msgl (RA preamble) :— UE may select the SS block and corresponding PRACH resource for path-loss estimation and (re) transmission — based on SS blocks that satisfy the threshold (see 38.213, section REF)
ssb-Threshold TYPE_FFS !
OPTIONAL,
— FFS : Provide proper description
— Corresponds to Ll parameter ' SUL-RSRP-Threshold' (see FFS_Spec, section FFS_Section) sul-RSRP-Threshold FFS_Value
OP IONAL,
Fig. 1 depicts the coverage area of a cell, when configured with SUL. The dark shaded area 10 represents the limited NUL coverage, whereas the light shaded area 11 represents the SUL coverage as well as the DL coverage of the cell. In RRC Connected mode, to allow the UE 13 to switch between the two UL carriers, the gNB can configure a parameter ( sul-RSRP-Threshold ). If the RSRP value measured by the UE in DL is above this threshold (closer to cell center), than it can use the NUL and if it is below this threshold (far from cell center), than it can use the SUL.
In this regard, it is noted that instead of the RSRP, any other measurement value in downlink can be used in combination with a respective threshold. Other nonlimiting examples of the downlink measurement value are Reference Signal Received Quality (RSRQ) and Received Signal Strength Indicator (RSSI). Additionally, in cells with beamforming there could also be some beam specific measurements.
In some scenarios, there could be a mismatch between the sul-RSRP-Threshold and the actual NUL coverage as shown in Fig. 1. The dotted line 12 represents the border as defined by the sul-RSRP-Threshold to allow the switching between NUL and SUL, which is bigger than the NUL coverage. In such a case, the UE 13 would try UL on the NUL carrier as it has not crossed the RSRP threshold but it will fail. The legacy behavior is that the UE 13 would re-try RACH access with incrementally increasing the transmit power in each attempt unless it reaches its maximum transmit power limit. If the UE 13 is still not able to make successful RACH, it will bar the cell for further attempts and try to search for other suitable cells. This would result into service interruption and negatively affect the UE quality of experience. Additionally, the dependency on UE power control parameters also need to be taken into account as in some scenarios, the threshold might be properly set but the UE power control parameters are the actual root cause for its unsuccessful RA attempts. Therefore, detailed information about the RA attempts needs to be provided to the serving cell for better root cause analysis as well as the rectification of the problem .
To assess the RA problems, a RACH report has been specified in LTE as given below (cf. 3GPP TS 36.331). However, it does not clearly differentiate between SUL and NUL RA. It is therefore not helpful to identify and rectify the RA problems related to the SUL operation. The current RACH report only mentions the number of preambles sent before a successful RA attempt and does not tell if there were also other unsuccessful attempts, e.g. on other RA resources before that successful attempt and on what resources (carriers) those unsuccessful attempts were made.
5.6.5 UE Information
5.6.5.1 General
The UE information procedure is used by E-UTRAN to request the UE to report information.
5.6.5.2 Initiation
E-UTRAN initiates the procedure by sending the UEinformationRequest message. E-UTRAN should initiate this procedure only after successful security activation.
5.6.5.3 Reception of the UEinformationRequest message
Upon receiving the UEinformationRequest message, the UE shall, only after successful security activation:
1 > if rach-ReportReq i s set to true, set the contents of the rach-Report in the UEInformationResponse message as follows:
2> set the numberOfPreamblesSent to indicate the number of preambles sent by MAC for the last successfully completed random access procedure;
2> if contention resolution was not successful as specified in TS 36.321 [6] for at least one of the transmitted preambles for the last successfully completed random access procedure: 3> set the contentionDetected to true ;
2> else:
3> set the contentionDetected to false ;
UEInformationResponse-r9-IEs ::= SEQUENCE {
rach-Report-r9 SEQUENCE {
numberOfPreamblesSent-r9
NumberOfPream lesSent-r11,
contentionDetected-r9 BOOLEAN
OPTIONAL
rlf-Report-r9 RLF-Report-r9
OPTIONAL,
nonCriticalExtension UEInformationResponse- v930-IEs OPTIONAL
According to example embodiments of the present invention, there is proposed a mechanism to identify the above-mentioned mismatch between the network parameter ( sul-RSRP-Threshold ) and the actual UL coverage of the cell as well as the means to rectify those problems.
Some aspects of example embodiments of the present invention are as follows:
If the UE is supposed to use NUL based on the sul-RSRP-Threshold but is unable to perform successful RA to the cell even after reaching its allowed maximum transmit power, the UE can try on SUL carrier before performing cell barring on this serving cell and trying to re-select to another cell.
If the UE is successful in its RA attempt on the SUL carrier, it will inform the gNB about the un-successful attempts on the NUL and the associated parameters it used for those attempts.
If the UE is unsuccessful in its RA attempt even on SUL carrier, it will search for a suitable cell. Once the UE is connected to the new cell, the UE can report the unsuccessful RA attempts and associated parameters to the new cell.
The new cell can then forward those reports to the original serving cell. The original serving gNB can analyse those reports (coming either directly from the UE or from the neighboring gNBs) and modify the network parameters like the sul-RSRP-Threshold or the UE specific parameters like the power control parameters.
For each unsuccessful RA attempt on the NUL, the UE can store the associated parameters. An example of what UE can store is shown in the following table:
Figure imgf000012_0001
The overall workflow is depicted in Figs. 2 and 3.
Fig. 2 shows the case when the UE can successfully perform RA on SUL carrier after a failure on NUL carrier and can directly report the failure attempts to the serving gNB.
Fig. 3 shows the case when UE is unable to perform RA on both the NUL and SUL carrier and then tries to connect to a second gNB. The second gNB then forwards the UE reports to the original serving gNB.
For both cases, the UE can use an extended version of the "UE Information" message as explained above to report the additional SUL specific information.
For the second case, the new gNB2 can use an extended version of "RLF indication" message to inform the original serving gNB about the reports from the UE and the SUL specific information.
Once the original serving gNB gets these reports from the UE or from the neighboring gNBs, it can analyze the root cause of the problem. Two underlying problems could be • Either the RSRP threshold is not properly configured such that it does not match the actual NUL coverage border,
• Or the UE allowed maximum transmit power is not properly configured i.e. it can still increase its transmit power if allowed by the network.
The gNB can then modify its relevant parameters based on the root cause analysis.
Referring to Fig. 2, in a step S21, the UE first tries to perform RA on the NUL to the gNB in a case where the RSRP is larger than the sul-RSRP-Threshold .
Then, when it is determined that no RA response is received from the gNB, the UE tries to perform RA on the SUL in step S22. After successful RA, the gNB sends a RA response in step S23.
Then, in step S24, the UE synchronizes on SUL and sends the extended version of the "UE Information" message including the failed attempts and parameters used in the attempts to the gNB, which can then make the root cause analysis and modify the parameters based thereon.
Referring to Fig. 3, in a similar manner as set out above, in a step S31, the UE first tries to perform RA on the NUL to a gNBl in a case where the RSRP is larger than the sul-RSRP-Threshold .
Then, when it is determined that no RA response is received from the gNB, the UE tries to perform RA on the SUL to the gNBl in step S32.
When it is again determined that no RA response is received from the gNBl, the UE searches for a suitable cell in step S33 and then synchronizes on the new cell in step S34.
In step S35, the UE then sends the extended version of the "UE Information" message including the failed attempts and parameters used in the attempts to the gNBl to the gNB2 serving the new cell. In step S36, the gNB2 serving the new cell then forwards the UE report to the gNBl of the original serving cell, which can then make the root cause analysis and modify the parameters based thereon.
According to certain embodiments of the present invention, the following advantages are provided.
The main advantage of certain embodiments of the present invention is that it can minimize service interruption for the UE because of the mismatch between the network parameters and the actual radio coverage. Additionally, it allows the network to detect and resolve the bad SUL configuration problems to totally avoid such problems in future, for example, either by adjusting the network (gNB) or UE configuration parameters.
In the following, a more general description of example versions of the present invention is made with respect to Figs. 4 to 6.
Fig. 4 is a flowchart illustrating an example of a method according to some example versions of the present invention.
According to example versions of the present invention, the method may be implemented in or may be part of a user equipment, or the like. The method comprises measuring (S41), at a user equipment served by a first base station, a measurement value in downlink to the first base station, if it is determined that the measurement value is larger than a threshold, making (S42) a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink, if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful, making (S43) a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
According to some example versions of the present invention, the method further comprises, after receiving a random access response from the first base station in response to the random access attempt for uplink to the first base station on the second frequency corresponding to secondary uplink, transmitting a message to the first base station including information on the parameters used in the unsuccessful random access attempt for uplink to the first base station on the first frequency.
According to some example versions of the present invention, the method further comprises, if it is determined that the random access attempt for uplink on the second frequency corresponding to the secondary uplink is not successful, searching for a second base station corresponding to a suitable cell, and after successfully attaching to the second base station, transmitting a message to the second base station including information on the parameters used in the unsuccessful random access attempt for uplink to the first base station on the first frequency and the second frequency.
According to some example versions of the present invention, a coverage area covered by the second frequency corresponding to secondary uplink is larger than a coverage area covered by the first frequency corresponding to normal uplink.
According to some example versions of the present invention, the method further comprises, if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful, prior to making the second random access attempt, stepwise increasing the transmit power of the user equipment up to an allowed maximum transmit power and repeatedly making the first random access attempt.
According to some example versions of the present invention, the parameters include at least one of a random access resource, a power, a time, the measurement value and the threshold.
According to some example versions of the present invention, the measurement value in downlink is one of a Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ) and Received Signal Strength Indicator (RSSI). Additionally, in cells with beamforming there could also be some beam specific measurements as the measurement value in downlink. Fig. 5 is a flowchart illustrating another example of a method according to some example versions of the present invention.
According to example versions of the present invention, the method may be implemented in or may be part of a base station, e.g. gNB, or the like. The method comprises receiving (S51), at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station, analyzing (S52) the information for detecting a root cause of the failed random access attempt, and modifying (S53) at least one of the parameters based on the analysis.
According to some example versions of the present invention, modifying at least one of the parameters includes at least one of configuring a threshold for a measurement value in downlink of the user equipment to the base station so as to match a border of a coverage area corresponding to normal uplink, and increasing an allowed maximum transmit power of the user equipment.
According to some example versions of the present invention, the method further comprises, forwarding the at least one modified parameter to the user equipment attached to the base station.
According to some example versions of the present invention, the parameters include at least one of a random access resource, a power, a time, the measurement value and the threshold.
According to some example versions of the present invention, the measurement value in downlink is one of a Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ) and Received Signal Strength Indicator (RSSI). Additionally, in cells with beamforming there could also be some beam specific measurements as the measurement value in downlink. Fig. 6 is a block diagram illustrating an example of an apparatus according to some example versions of the present invention.
In Fig. 6, a block circuit diagram illustrating a configuration of an apparatus 60 is shown, which is configured to implement the above described various aspects of the invention. It is to be noted that the apparatus 60 shown in Fig. 6 may comprise several further elements or functions besides those described herein below, which are omitted herein for the sake of simplicity as they are not essential for understanding the invention. Furthermore, the apparatus may be also another device having a similar function, such as a chipset, a chip, a module etc., which can also be part of an apparatus or attached as a separate element to the apparatus, or the like.
The apparatus 60 may comprise a processing function or processor 61, such as a CPU or the like, which executes instructions given by programs or the like. The processor 61 may comprise one or more processing portions dedicated to specific processing as described below, or the processing may be run in a single processor. Portions for executing such specific processing may be also provided as discrete elements or within one or further processors or processing portions, such as in one physical processor like a CPU or in several physical entities, for example. Reference sign 62 denotes transceiver or input/output (I/O) units (interfaces) connected to the processor 61. The I/O units 62 may be used for communicating with one or more other network elements, entities, terminals or the like. The I/O units 62 may be a combined unit comprising communication equipment towards several network elements, or may comprise a distributed structure with a plurality of different interfaces for different network elements. The apparatus 60 further comprises at least one memory 63 usable, for example, for storing data and programs to be executed by the processor 61 and/or as a working storage of the processor 61.
The processor 61 is configured to execute processing related to the above- described aspects. In particular, the apparatus 60 may be implemented in or may be part of a user equipment or the like, and may be configured to perform processing as described in connection with Fig. 4.
Further, the apparatus 60 may be implemented in or may be part of a base station, e.g. gNB, or the like, and may be configured to perform processing as described in connection with Fig. 5.
Further, the present invention may be implement by an apparatus comprising means for performing the above-described processing.
That is, if the apparatus is implemented in or is part of a user equipment or the like, the apparatus comprises means for measuring, at the user equipment served by a first base station, a measurement value in downlink to the first base station, if it is determined that the measurement value is larger than a threshold, means for making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink, if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful, means for making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
Further, if the apparatus is implemented in or is part of a base station, e.g. gNB, or the like, the apparatus comprises means for receiving, at the base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station, means for analyzing the information for detecting a root cause of the failed random access attempt, and means for modifying at least one of the parameters based on the analysis.
For further details regarding the functions of the apparatus, reference is made to the description of the methods according to some example versions of the present invention as described in connection with Figs. 4 and 5. In the foregoing exemplary description of the apparatus, only the units/means that are relevant for understanding the principles of the invention have been described using functional blocks. The apparatus may comprise further units/means that are necessary for its respective operation, respectively. However, a description of these units/means is omitted in this specification. The arrangement of the functional blocks of the apparatus is not to be construed to limit the invention, and the functions may be performed by one block or further split into sub-blocks.
When in the foregoing description it is stated that the apparatus (or some other means) is configured to perform some function, this is to be construed to be equivalent to a description stating that a (i.e. at least one) processor or corresponding circuitry, potentially in cooperation with computer program code stored in the memory of the respective apparatus, is configured to cause the apparatus to perform at least the thus mentioned function. Also, such function is to be construed to be equivalently implementable by specifically configured circuitry or means for performing the respective function (i.e. the expression "unit configured to" is to be construed to be equivalent to an expression such as "means for").
For the purpose of the present invention as described herein above, it should be noted that
- method steps likely to be implemented as software code portions and being run using a processor at an apparatus (as examples of devices, apparatuses and/or modules thereof, or as examples of entities including apparatuses and/or modules therefore), are software code independent and can be specified using any known or future developed programming language as long as the functionality defined by the method steps is preserved;
- generally, any method step is suitable to be implemented as software or by hardware without changing the idea of the aspects/embodiments and its modification in terms of the functionality implemented;
- method steps and/or devices, units or means likely to be implemented as hardware components at the above-defined apparatuses, or any module(s) thereof, (e.g., devices carrying out the functions of the apparatuses according to the aspects/embodiments as described above) are hardware independent and can be implemented using any known or future developed hardware technology or any hybrids of these, such as MOS (Metal Oxide Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar MOS), BiCMOS (Bipolar CMOS), ECL (Emitter Coupled Logic), TTL (Transistor-Transistor Logic), etc., using for example ASIC (Application Specific IC (Integrated Circuit)) components, FPGA (Field- programmable Gate Arrays) components, CPLD (Complex Programmable Logic Device) components, APU (Accelerated Processor Unit), GPU (Graphics Processor Unit) or DSP (Digital Signal Processor) components;
- devices, units or means (e.g. the above-defined apparatuses, or any one of their respective units/means) can be implemented as individual devices, units or means, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device, unit or means is preserved;
- an apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of an apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor;
- a device may be regarded as an apparatus or as an assembly of more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.
In general, it is to be noted that respective functional blocks or elements according to above-described aspects can be implemented by any known means, either in hardware and/or software, respectively, if it is only adapted to perform the described functions of the respective parts. The mentioned method steps can be realized in individual functional blocks or by individual devices, or one or more of the method steps can be realized in a single functional block or by a single device.
Generally, any method step is suitable to be implemented as software or by hardware without changing the idea of the present invention. Devices and means can be implemented as individual devices, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device is preserved. Such and similar principles are to be considered as known to a skilled person.
Software in the sense of the present description comprises software code as such comprising code means or portions or a computer program or a computer program product for performing the respective functions, as well as software (or a computer program or a computer program product) embodied on a tangible medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means/portions or embodied in a signal or in a chip, potentially during processing thereof.
It is to be noted that the aspects/embodiments and general and specific examples described above are provided for illustrative purposes only and are in no way intended that the present invention is restricted thereto. Rather, it is the intention that all variations and modifications which fall within the scope of the appended claims are covered.

Claims

1. A method, comprising :
measuring, at a user equipment served by a first base station, a measurement value in downlink to the first base station,
if it is determined that the measurement value is larger than a threshold, making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink,
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
2. The method according to claim 1, further comprising :
after receiving a random access response from the first base station in response to the random access attempt for uplink to the first base station on the second frequency corresponding to secondary uplink, transmitting a message to the first base station including information on the parameters used in the unsuccessful random access attempt for uplink to the first base station on the first frequency.
3. The method according to claim 1, further comprising :
if it is determined that the random access attempt for uplink on the second frequency corresponding to the secondary uplink is not successful,
searching for a second base station corresponding to a suitable cell, after successfully attaching to the second base station, transmitting a message to the second base station including information on the parameters used in the unsuccessful random access attempt for uplink to the first base station on the first frequency and the second frequency.
4. The method according to any one of claims 1 to 3, wherein a coverage area covered by the second frequency corresponding to secondary uplink is larger than a coverage area covered by the first frequency corresponding to normal uplink.
5. The method according to any one of claims 1 to 4, further comprising
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
prior to making the second random access attempt, stepwise increasing the transmit power of the user equipment up to an allowed maximum transmit power and repeatedly making the first random access attempt.
6. A method, comprising :
receiving, at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station,
analyzing the information for detecting a root cause of the failed random access attempt, and
modifying at least one of the parameters based on the analysis.
7. The method according to claim 6, wherein
modifying at least one of the parameters includes at least one of configuring a threshold for a measurement value in downlink of the user equipment to the base station so as to match a border of a coverage area corresponding to normal uplink, and increasing an allowed maximum transmit power of the user equipment.
8. The method according to claim 6 or 7, further comprising :
forwarding the at least one modified parameter to the user equipment attached to the base station.
9. The method according to any one of claims 1 to 8, wherein
the parameters include at least one of a random access resource, a power, a time, the measurement value and the threshold.
10. An apparatus for use in a user equipment, comprising : at least one processor, and
at least one memory for storing instructions to be executed by the processor, wherein
the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus at least to perform :
measuring, at the user equipment served by a first base station, a measurement value in downlink to the first base station,
if it is determined that the measurement value is larger than a threshold, making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink,
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
11. The apparatus according to claim 10, wherein the at least one memory and the instructions are further configured to, with the at least one processor, cause the apparatus at least to perform:
after receiving a random access response from the first base station in response to the random access attempt for uplink to the first base station on the second frequency corresponding to secondary uplink, transmitting a message to the first base station including information on the parameters used in the unsuccessful random access attempt for uplink to the first base station on the first frequency.
12. The apparatus according to claim 10, wherein the at least one memory and the instructions are further configured to, with the at least one processor, cause the apparatus at least to perform:
if it is determined that the random access attempt for uplink on the second frequency corresponding to the secondary uplink is not successful,
searching for a second base station corresponding to a suitable,
after successfully attaching to the second base station, transmitting a message to the second base station including information on the parameters used in the unsuccessful random access attempt for uplink to the first base station on the first frequency and the second frequency.
13. The apparatus according to any one of claims 10 to 12, wherein
a coverage area covered by the second frequency corresponding to secondary uplink is larger than a coverage area covered by the first frequency corresponding to normal uplink.
14. The apparatus according to any one of claims 10 to 13, wherein the at least one memory and the instructions are further configured to, with the at least one processor, cause the apparatus at least to perform:
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
prior to making the second random access attempt, stepwise increasing the transmit power of the user equipment up to an allowed maximum transmit power and repeatedly making the first random access attempt.
15. An apparatus for use in a base station, comprising :
at least one processor, and
at least one memory for storing instructions to be executed by the processor, wherein
the at least one memory and the instructions are configured to, with the at least one processor, cause the base station apparatus at least to perform:
receiving, at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station,
analyzing the information for detecting a root cause of the failed random access attempt, and
modifying at least one of the parameters based on the analysis.
16. The apparatus according to claim 15, wherein
modifying at least one of the parameters includes at least one of configuring a threshold for a measurement value in downlink of the user equipment to the base station so as to match a border of a coverage area corresponding to normal uplink, and increasing an allowed maximum transmit power of the user equipment.
17. The apparatus according to claim 15 or 16, wherein the at least one memory and the instructions are further configured to, with the at least one processor, cause the apparatus at least to perform:
forwarding the at least one modified parameter to the user equipment attached to the base station.
18. The apparatus according to any one of claims 10 to 17, wherein
the parameters include at least one of a random access resource, a power, a time, the measurement value and the threshold.
19. An apparatus, comprising :
means for measuring, at a user equipment served by a first base station, a measurement value in downlink to the first base station,
if it is determined that the measurement value is larger than a threshold, means for making a first random access attempt for uplink to the first base station on a first frequency corresponding to normal uplink,
if it is determined that the random access attempt for uplink on the first frequency corresponding to the normal uplink is not successful,
means for making a second random access attempt for uplink to the first base station on a second frequency corresponding to secondary uplink, the second frequency being different from the first frequency.
20. An apparatus for use in a base station, comprising :
means for receiving, at a base station, a message including information on parameters used by a user equipment in a failed random access attempt for an uplink to the base station,
means for analyzing the information for detecting a root cause of the failed random access attempt, and
means for modifying at least one of the parameters based on the analysis.
21. A computer program comprising instructions for causing an apparatus to perform the method according to any one of claims 1 to 9.
22. A computer readable medium storing a computer program according to claim 21.
PCT/EP2018/071768 2018-08-10 2018-08-10 Secondary uplink mode selection optimization WO2020030283A1 (en)

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