ELECTRONIC DEVICE AND METHOD USED FOR WIRELESS
COMMUNICATIONS
The application claims the priority of Chinese Patent Application No. 201510184663.8, titled
5 "ELECTRONIC DEVICE AND METHOD USED FOR WLRELESS COMMUNICATIONS",
filed on April 17, 2015 with the State Intellectual Property Office of People's Republic of
China, which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
10 [OOOl] The present disclosure generally relates to the field of wireless communication, and
in particular to an electronic device and a method for wireless communication.
BACKGROUND
[0002] With the increasing demand of users for high-speed data transmission, the Long
15 Term Evolution (LTE) technology is undoubtedly one of the most competitive wireless
transmission technologies. However, with the increasing demand for data transmission,
increasing the transmission bandwidth and improving the spectrum utilization will be the key
to improve the overall performance of the system. In this context, the use of unlicensed
frequency bands receives more and more attentions from operators, and the unlicensed
20 frequency bands are considered to be used as supplementary for the existing LTE licensed
frequency bands to improve the quality of service to the user. Hence, the first problem to be
solved is how to use the unlicensed frequency bands and to coexist with other systems in the
unlicensed frequency bands. At present, the consensus reached by the industry is that an
unlicensed frequency band needs to be used with the assistance of the licensed spectrum to
25 provide service for a terminal by carrier aggregation.
[0003] When a terminal has data to be transmitted, the terminal needs to transmit a
scheduling request (SR) to a base station for requesting transmission resources. After that, a
30 buffer status report (BSR) may be transmitted to inform the base station of a data volume of a
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buffer on the terminal side so that the base station assigns a reasonable transmission resource.
However, in a scenario involving a transmission in an unlicensed frequency band such as
license assisted access (LAA), for example, the conventional technology has the following
problems:
5 [0004] (1) An LAA is very dynamic for the use of an unlicensed spectrum. For the sake of
fairness and for avoiding interferences to other systems, the use of the spectrum by the user
may be interrupted at any time. Hence, the LAA is only suitable for traffic with a low
requirement for communication quality, and is not suitable for real-time and high reliability
traffics. However, the information is not contained in the design of the existing SR.
10 [0005] (2) In addition to the buffer status information, other auxiliary information for
assisting the decision of the base station to assign resources of the unlicensed spectrum to the
user is not taken into account in the existing SR design.
[0006] (3) Depending on whether the LAA can operate independently and whether it
operates with the licensed spectrum by carrier aggregation, the SR process thereof is different.
15 [0007] A brief overview of embodiments of the present disclosure is given below to provide
a basic understanding of certain aspects of the present disclosure. It is to be understood that
the following overview is not an exhaustive overview of the present disclosure. It is not
intended to determine the critical or important part of the disclosure, nor is it intended to limit
the scope of ihe disclosure. The purpose is merely giving some concepts in a simplified
20 manner as a prelude to the more detailed description of the later discussion.
[0008j According t~ an embodiment, an electronic device for wireless communication
includes at least one processor configured to: determine a data status of low priority traffic
available for an uplink transmission; and generate, based on the data status of the low priority
traffic, scheduling assistance information for a scheduler of a base station, the scheduling
25 assistance information being related to a transmission of a user equipment on an unlicensed
transmission resource.
[0009j According to another embodiment, a method for wireless communication includes:
determining a data status of low priority traffic available for an uplink transmission; and
generating, based on the data status of the low priority traffic, scheduling assistance
30 information for a scheduler of a base station, the scheduling assistance information being
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related to a transmission of a user equipment on an unlicensed transmission resource.
[0010] According to yet another embodiment, an electronic device for wireless
communication includes at least one processor configured to: assign an unlicensed
transmission resource based on scheduling assistance information from a user equipment
5 regarding low priority traffic; and generate scheduling assignment information regarding the
unlicensed transmission resource, for transmission of the user equipment.
[0011] According to another embodiment, a method for wireless cominunication includes a
step of assigning an unlicensed transmission resource based on scheduling assistance
information from a user equipment regarding low priority traffic, and a step of generating
10 scheduling assignment information regarding ihe unlicensed transmission resource, for
transmission of the user equipment.
[0012] According to yet another embodiment, a device for terminal side of a wireless
communication system includes an acquisition unit, a generation unit and a transmission unit.
The acquisition unit is configured to acquire a data volume of low priority traffic to be
15 transmitted in a buffer of a logical channel of ihe device. The generation unit is configured to
include infannation regarding the data volume into a buffer status report. The iransmission
unit is configured to transmit the buffer status report io a base station.
[0013] According to another embodiment, a wireless communication method used by a
device on terminal side includes: acquiring a data volume of low priority traffic to be
20 transmitted in a buffer of a logical channel of the device; including information regarding the
data volume into a buffer status report; and transmitting the buffer status report to a base
station.
[0014] According to yet another embodiment, a device for base station side of a wireless
communication system includes a reception unit and a scheduling unit. The reception unit is
25 configured to receive a buffer status report in which information regarding a data volume of
low priority traffic to be transmitted on a logical channel of a terminal side device is included.
The scheduling unit is configured to assign an uplink transmission resource for the terminal
side device based on the information regarding the data volume.
[0015] According to another embodiment, a wireless communication method used by a
30 device on base station side includes: receiving a buffer status report in which information
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regarding a data volume of low priority traffic to be transmitted on a logical channel of a
terminal side device is included; and assigning an uplink transmission resource for the
terminal side device based on the information regarding the data volume.
5 BRIEF DESCNPTION OF THE DRAWINGS
[OOlG] The present disclosure may be better understood by referring to the following
description given in conjunction with the accompanying drawings in which same or similar
reference numbers are used throughout the drawings to refer to the same or lilce parts. The
accompanying drawings, together with the following detailed description, are included in this
10 specification and form a part of this specification, and are used to further illustrate preferred
embodiments of the present disclosure and to explain the principles a d advantages of the
present disclosure. In the drawings:
[0017] FIG 1 is a block diagram illustrating a configuration example of an electronic device
for wireless communicalion according to an embodiment of the present disclosure;
15 [0018] FIG 2 is a block diagram illustrating a configuration example of an electronic device
for wireless communication according to another embodiment;
[0019] FIG. 3 is a block diagram illustrating a configuration example of a user equipment
according to yet another embodiment;
100201 FIG. 4 is a flowchart illustrating a process example of a method for wireless
20 communication according to an embodiment of the present disclosure;
[0021] FIG. 5 is a block diagram illustrating a configuration example of an electronic device
for wireless communication according to an embodiment of the present disclosure;
[0022] FIG. 6 is a block diagram illustrating a configuration example of an electronic device
for wireless communication according to another embodiment;
25 [0023] FIG. 7 is a block diagram illustrating a configuration example of a base station
according to yet another embodiment;
[0024] FIG. 8 is a flowchart illustrating a process example of a method for wireless
communication according to an embodiment of the present disclosure;
[0025] FIG. 9 is a block diagram illustrating a configuration example of a device for
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terminal side of a wireless communication system according to an embodiment of the present
disclosure;
[0026] FIG. 10 is a flowchart illustrating a process example of a wireless communication
method used by a device on terminal side according to an embodiment of the present
5 disclosure;
[0027] FIG. 11 is a block diagram illustrating a configuration example of a device for base
station side of a wireless communication system according to an embodiment of the present
disclosure;
[0028] FIG. 12 is a flowchart illustrating a process example of a wireless communication
10 method used by a device on base station side according to an embodiment of the present
disclosure;
[0029] FIG. 13 is a block diagram illustrating an illustrative structure of a computer for
implementing a method and a device according lo the present disclosure;
[0030] FIG. 14 is a block diagram illustrating an example of a schematic configuration of a
15 smartphone to which the technology of the present disclosure is applicable;
[0031] FIG. 15 is a block diagram illustrating an example of a schematic configuration of a
eNB (evolved base station) to which the technology of the present disclosure is applicable;
[0032] FIG. 16 illustrates a structure of a media access control packet data unit according to
the conventional technology;
20 [0033] FIG. 17 illustrates an exemplary structure of a media access control packet data unit
corresponding to an embodiment of the present disclosure;
[0034] FIG. 18 illustrates a table of logical channel identifiers for an uplink shared channel
according to the conventional technology;
[0035] FIG. 19 illustrates an example of a table of logical channel identifiers corresponding
25 to an embodiment of the present disclosure;
[0036j FIG. 20 illustrates ail example of a scheduling request transmission process in an
LAA scenario according to a specific embodiment; and
[0037] FIG. 21 illustrates another example of a scheduling request transmission process in
an LAA scenario according to another specific embodiment.
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DETAILED DESCRTPTION OF THE EMBODIMENTS
[0038] Embodiments of the present disclosure are described by referring to the drawings in
the following. Elements and features described in one of the drawings or one embodiment of
5 the present disclosure may be combined with elements and features as shown in one or more
other drawings or embodiments. It should be noted that, for the purpose of clarity, indication
and description of components and processing irrelevant to the present disclosure and known
by those skilled in the art are omitted in the drawings and the explanation.
[0039] As shown FIG. 1, an electronic device 100 for wireless communication according to
10 an embodiment of the present disclosure includes at least one processor 110 configured to:
determine a data status of low priority traffic available for an uplink transmission; and
generate, based on the data status of the low priority traffic, scheduling assistance information
for a scheduler of a base station. The scheduling assistance information is related to a
transmission of a user equipment on an unlicensed transmission resource.
15 [0040] It is to be nodded that, for illustrative purposes, it is shown in FIG 1 with dashed
boxes that the processor 110 includes a determination unit 11 1 and a generation unit 11 3. The
determination unit 111 may correspond to the function of determining the data status of the
low priority traffic available for the uplink transmission, and the generation unit 113 may
correspond to the function of generating, based on the data status of the low priority traffic,
20 the scheduling assistance information for the scheduler of the base station. However, it should
be understood that, functions of the determination unit 11 1 and the generation unit 113 may be
implemented by the processor 110 as a whole, and are not necessarily implemented by actual
discrete coinponents in the processor 11 0. In addition, although the processor 11 0 is shown by
a single box in FIG. 1, the electronic device 100 may include multiple processors, and
25 functions corresponding to the determination unit 111 and the generation unit 113 may be
distributed to the multiple processors so that the multiple processors cooperate to perform
these functions. The same applies to other embodiments described below in conjunction with
similar block diagrams.
[0041] Still with reference to FIG. 1, the low priority traffic includes, for example, traffic
30 having low requirement on quality of service (QoS). For example, the low QoS traffic may
include traffic with a high delay tolerance, traffic with a high error rate tolerance, traffic
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related to non-core content such as advertisement data and the like. In a specific example, the
electronic device 100 determines QoS information (for example, a parameter such as QCI,
ARP, GBR, AMBR) of a radio bearer of data to be transmitted, and determines whch of the
traffic to be transmitted is low priority traffic based on a correspondence between the QoS
5 information and a predetermined parameter regarding low QoS (for example, whether a QoS
level indicated by QCI falls within a range of low QoS level). For example, a wireless
network operator may configure the predetermined parameter regarding low QoS within the
network thereof according to requirements. It can be understood that, in different
communication systems, evaluation of the traffic priority may be based on different
10 parameters of service quality requirements, and the case of an LTE communication system is
given only as an example in the above.
[0042] Additionally, the scheduling assistance information may include, for example, the
license assisted access scheduling request (LAA-SR) itself, a buffer status report (BSR), a
geographical position of a user equipment, an idle condition of candidate channel on an
15 unlicensed transmission resource, a channel quality of a candidate channel on the unlicensed
transmission resource. and the like.
[0043] The scheduler in the base station determines an uplink resource which can be used
for transmission for user equipments served by the base station. For example, the scheduler of
the base station detennines which user equipments can obtain an uplink resource and which
20 uplink time frequency resources can be obtained, for example, available resource blocks or
specific component carriers on a transmission layer such as an uplink shared channel
(UL-SCI-I) in a LTE system. Further, the base station may further control a transmission
format selection of a user equipment (the selection of size of transmission block, modulation
scheme, antenna mapping and the like). The scheduler according to the present disclosure
25 performs scheduling, for example, user equipment by user equipment. In ihe existing
communication protocol, the scheduler generally performs uplink resource scheduling
autonomously based on a general scheduling request (SR) andlor buffer status report of the
user equipment. For example, regarding which component carriers are to be scheduled, the
user equipment does not make recommendation or requirement for a specific resource or even
30 provide related information.
[0044] In order to implement the uplink transmission resource request based on the LAA,
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the scheduling request LAA-SR for the LAA resource is provided by an example scheme
according to the present disclosure. As will be described in conjunction with a specific
example process later, transmission objects of the LAA-SR are slightly different depending on
whether there is an uplink transmission resource in an LAA cell: if there is no uplink
5 transmission between the LAA cell and a requesting user equipment (for example, there is no
resource for transmitting the LAA-SR in LAA frequency bands), then the transmission object
of the LAA-SR is a primary cell (a cell corresponding to a primary component carrier (PCC),
which may be, for example, a macro cell or a small cell in an licensed frequency hand); if
there is uplink transmission between the LAA cell and a requesting user equipment (for
10 example, there is resource for transmitting the LAA-SR in LAA frequency bands), then the
transmission object of the LAA-SR is the LAA cell. In an example of the present disclosure,
the LAA-SR and a common SR have the same signalimg structure, for example, are both
carried by the PUCCH and transmitted to the primary cell, and it is determined that the SR is
an LAA-SR based on that the BSR is transmitted immediately after the LAA-SR. Accordingly,
15 when the base station acquires the SR and the BSR and performs resource scheduling, an
unlicensed frequency band is preferentially scheduled for a corresponding user equipment, for
example, by activating and scheduling an LAA component carrier. In another example of the
present disclosure, the hase station pre-configures a dedicated LAA-SR resource for the user
equipment (for example, configured through SchedulingRequestCon$g in RRC signaling),
20 and the SR being received on a corresponding resource by the hase station is considered as a
scheduling request for an unlicensed resource. In another example of the present disclosure,
all SRs received on the LAA frequency bands by the base station are considered as the
resource scheduling request for LAA frequency bands. Thereby, the user equipment can
initiatively recommend the required specific resource type.
25 100451 The SR only indicates that there is uplink data to be transismitied on a terminal, and
the amount of resource that needs to be assigned depends on, for example, the buffer data
volume in the BSR. According to the BSR specified in the existing standard, a total data
volume corresponding to all logical channels in the same logical channel group is reported. As
described above, the use of LAA is very dynamic, and thus is more applicable to non-real
30 time traffic (low QoS traffic). However, this type of information is not included in design of
the existing BSR.
[0046] According to an embodiment, a data status of low priority traffic determined by the
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processor 110 (the determination unit 11 1) may include a data volume of low priority traffic
available for an uplink transmission in a buffer. Moreover, in a case that the assistance
information includes the BSR, the processor 110 (the generation unit 113) may include, in the
BSR, indication information for the determined data volume of low priority traffic, for use by
5 a scheduler of the base station. Unlike the indication information on a data volume contained
in the BSR in the conventional technology, the indication information according to this
embodiment may include only information regarding the size of a buffer of the low priority
traffic, and not include information on a size of a buffer of high priority traffic.
100471 Additionally, the processor 110 (the generation unit 113) may further include, in the
10 BSR, identification information of a logical channel and/or a logical channel group to which
the low priority traffic belongs, where the logical channel includes, for example, a dedicated
traffic channel (DTCH).
[0048] In terms of LAA resource scheduliig, the amount of corresponding low priority data
in a traffic channel is the most important. Hence, the embodiment provides a BSR, which
15 reflects a volume of data with low QoS (which may correspond to a low priority in channel
configuration thereof) in a corresponding logical channel such as a dedicated traffic channel
DTCH. For example, the BSR has the following format: 1 Sub-logical channel ID (2 bits) 1 Buffer size of low priority traffic on a 1
I I corresponding logical channel (6 bits) 1
[0049] The sub-logical channel ID (sub-LCID) (having a length of, for example, 2 bits)
represents a logical channel corresponding to the BSR. Since a communication resource on an
20 unlicensed frequency band is unstable, it is generally used to transmit traffic data. Accordingly,
a BSR only for, for example, DTCI-I can be designed so as to decrease the complexity of the
BSR. In this case, the sub-LCID may not be set. In another aspect, the sub-LCID may also be
retained. The advantage of retaining the sub-LCID is being capable of keeping consistent with
a structure of an existing BSR media access control control element (MAC CE). However, the
25 present disclosure is not limited thereto. For example, the BSR may be directed to other
required logical channels, for example, a control channel such as a common control channel
(CCCH) and a dedicated control channel (DCCH), or other traffic channels evolving with the
standards or in a communication standard other than LTE-A.
[0050] In another example, the above sub-logical channel ID may be substituted by a
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logical channel group ID (LCG ID) in the conventional technology, and the MAC CE carries
information on a buffer size of low priority traffic of the entire logical channel group
corresponding to the LCG ID rather than being limited to a specific logical channel. For
example, the BSR has the following format.
I LCG ID (2 bits) / Buffer size of low priority traffic on a (
I I corresponding logical channel group (6 bits) 1
5 [0051] In the above exemplary BSR format, the buffer size is indicated using six bits, which
is the same as the existing standard. However, the present disclosure is not limited thereto,
and a different data length may be used to indicate the buffer size according to requirements.
[0052] Further, according to an embodiment, the processor 110 (the generation unit 113)
may further include, in the MAC CE, a BSR regarding the low priority traffic, and generate a
10 subhead of an MAC protocol data unit corresponding to the MAC CE. The subhead may
contain type information indicating that the MAC CE is the BSR regarding the low priority
traffic.
[0053] More specifically, the type information may be indicated by a logical channel
identification in the subhead, and an index value of the logical channel identification is one of
15 binary values 01011 to 11000.
[0054] It is to be noted that, the subhead of the existing MAC protocol data unit for BSR
may be multiplexed in some examples. For example, it is determined that the MAC CE is the
BSR related to the low priority traffic based on a transmission relation between the BSR and
the SR. For example, it can be determined that the BSR is related to the low priority traffic in
20 a case that the BSR is transmitted immediately after the SR. For another example, type
information on whether the MAC CE is the BSR related to the low priority traffic is carried
by a load of the MAC CE. Specifically, the buffer size of the low priority traffic is generally
smaller than the conventional buffer size of all traffic, it is therefore possible to be designed as
that, for example, only five bits are used to indicate the buffer size and one bit is used to
25 indicate whether the BSR is a BSR for low priority traffic of the LAA.
[0055] For example, the BSR has the following format:
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[0056] Additionally, according to an optional scheme, a UE may not transmit the SR but
directly transmit the BSR, the base station may determine that the BSR is related to low
priority traffic based on, for example, the subhead of the MAC packet data unit (PDU) or the
above described 1-bit indication bit, and the request for resource scheduling is implied in
5 transmission of the BSR. Therefore, the base station may perform resource scheduling based
on the BSR directly.
Buffer size of low priority traffic of a
corresponding LCG (5 bits)
LCG ID (2 bits)
I00571 Next, structure of an MAC message (MCA PDU) according to existing standard is
first described by referring to FIG. 16. As shown in FIG. 16, the MAC message includes an
MAC head and an MAC payload. Specifically, as shown by the dashed line, the MAC head
10 includes multiple subheads, and the MAC payload includes MAC CEiMAC service data unit
(SDU)ifilling. Each subhead of the MAC head indicates a payload in a corresponding position
LAA BSR indication (lbit)
(as indicated sequentially by arrows in FIG. 16).
[0058] FIG. 17 illustrates an exemplary structure of an MAC message corresponding to an
exemplary embodiment. A structure of a subhead corresponding to the MAC CE of the LAA
15 BSR is R/R/ELCID (E: whether there are multiple fields, for example, whether there is a next
group of RIRIEILCID; R: reserved) including four fields. It is determined whether it is a
subhead of the LAA BSR mainly based on the LCD (conventional) (the LCID may indicate
the type of the MAC CE). For example, a value of the LCID in the MAC subhead of the LAA
BSR according to the present disclosure is one of binary values 01 01 1 to 11 000 (for example,
20 0101 1, on which a consensus is reached between the UE and the BS). Since 0101 1 to 11000
are reserved bits of the LCID, the LAA BSR may be easily indicated without changing the
standard. Additionally, as indicated by the arrows in FIG. 17, the subheads of MAC head
indicate payloads in corresponding positions
[0059] Correspondingly, FIG. 18 and FIG. 19 respectively illustrate an LCID value list for
25 uplink shared channels according the existing standard and an LCID value list corresponding
to the above exemplary embodiment according to the present disclosure. As can be seen by
comparison, in this exemplary embodiment, 0101 1 in the reserved bits in the existing standard
is used to indicate that the MAC CE is related to the LAA BSR, and 01100 is used to indicate
that the MAC CE is related to channel availability. However, the index value of a
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corresponding logical channel identification may a value other than the binary values 01011
to 11000.
[0060] Additionally, there are the following triggering conditions for transmission timing of
the above BSR:
5 [0061] (1) the BSR is transmitted after the LAA-SR is transmitted;
100621 (2) transmitted when there is low QoS data to be transmitted in the DTCH;
I00631 (3) the BSR is transmitted when a timer for regularly transmitting the BSR expires,
where the timer in the existing standard may be reused, or a timer may be newly defined.
[0064] Additionally, the BSR may be transmitted in a form of a short BSR, a truncated BSR,
10 or even a long BSR.
[0065] In addition to the BSR information, other assistance information may further be
transmitted after the LAA-SR so as to provide a decision basis to subsequent LAA resource
assignment. The information may include, for example, geographical position information of
the terminal, an idle condition of candidate channel in an unlicensed frequency band such as a
15 5G frequency band (the terminal needs to perform detection in a manner, for example,
according to the conventional technology), and the like. A new MAC CE may be defined to
transmit the geographical position information of the terminal.
[0066] For example, the CE of the idle condition of candidate channel in the 5G frequency
subsequent 1 bit identifies whether the channel is available, and followed by 2 reserved bits
band may have the following format.
for adding other information such as channel quality information.
10068j For another example, the unlicensed frequency band may be divided into no more
than 8 unlicensed channels in advance, for example, each channel corresponds to a preset
25 frequency range, and an order is set for the candidate channels (the UE and the base station
reach a consensus), and there is no need for a special indication for channel ID. Accordingly,
the CE for indicating an idle coildition of candidate channel may have the following forinat,
for example.
Reversed Channel Id (5 bits) (2 bits)
20 [0067] First 5 bits identify a channel ID of the detected unlicensed frequency band, a
Whether available (1 bit)
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100691 Accordingly, the base station side may determine the idle condition of candidate
channel in the unlicensed frequency band based on the MAC CE which indicates the
availability of channel, and perform resource scheduling from transmission resources
corresponding to the idle channels.
Whether
CHI is
available
(1 bit)
5 [00701 Similar to the subhead of the MAC CE of the LAA BSR, the subhead of the CE has
a structure including four fields RIRIEILCID, where the value of the LCID may be one of
01011 to 11000 (and is required to be different from the value of the LCID of the MACCE of
the LAA BSR).
[0071] Although a case where the MAC PDU includes the LAA BSR is described in the
10 above exemplary embodiment, in an example according to the present disclosure, one MAC
PDU generated by the UE may include both the conventional BSR and the LAA BSR.
Whether
CH2 is
available
(1 bit)
Correspondingly, the base station may determine a resource scheduling scheme based on the
conventional BSR in combination with the LAA BAR.
[0072] Next, a configuration example of an electronic device for wireless communication
15 according to another embodiment is described with reference to FIG. 2.
Whether
CH3 is
available
(1 bit)
100731 As shown in FIG. 2, the electronic device 200 includes at least one processor 210. In
addition to being configured to perform the functions described with reference to FIG. 1 (that
is, the determination unit 211 and the generation unit 213 are similar to the determination unit
11 1 and the generation unit 11 3), the processor 2 10 is further configured to map, based on
20 scheduling assignment information of the scheduler of the base station, data of the low
priority traffic to a corresponding unlicensed transmission resource, for tra~~sinissiotno the
base station.
100741 The unlicensed transmission resource includes, for example, a transmission resource
in a WiFi frequency band or a television (TV) frequency band. More specifically, data may be
25 mapped to a PUSCH (Physical Uplink Shared Channel) resource (for example, a specific
channel), a component carrier, a time-frequency resource block, a frequency band, a valid
Whether
CH4 is
available
(1 bit)
Whether
CH5 is
available
(1 bit)
Whether
CH6 is
available
(1 bit)
Whether
CH7 is
available
(1 bit)
Whether
CH8 is
available
(1 bit)
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time period and the like, based on the scheduling assignment information.
[0075] Further, an electronic device for wireless communication according to an
embodiment may be the user equipment itself. As shown in FIG. 3, the electronic device 300
according to this embodiment includes at least one processor 310 and a transmitter 320.
5 [0076] In addition to being configured to perform functions described with reference to FIG.
1 (that is, the determination unit 311 and the generation unit 313 are similar to the
determination unit 11 1 and the generation unit 113), the processor 3 10 is further configured to
select a transmission resource for transmitting the scheduling assistance information based on
the availability of a transmission resource from the user equipment to the base station (the
10 selection unit 315). For example, the transmission resource may be selected from the licensed
frequency bands and the unlicensed frequency bands, or may be selected from a physical
uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) and a random
access channel (RACH). Specifically, for example, in a case that the user equipment has been
assigned with a data transmission resource such as a PUSCH resource, it is preferable to
15 select a data transmission resource to cany the schedulmg assistance information such as the
BSR regarding the LAA; for example, in a case that the user equipment is configured with
only a control information transmission resource such as a PUCCH resource, it can be
determined that the scheduling assistance information such as the LAA-SR is carried by the
control information transmission resource; in a case that the user equipment neither obtains
20 the data transmission resource nor is configured with the control information transmission
resource, it is determined that the authorization by the base station and the resource for an
uplink transmission is obtained via a random access, for example, the scheduling assistance
information regarding the LAA is transmitted via the RACH.
[0077] The transmitter 320 is configured to transmit the scheduling assistance information
25 via the selected transmission resource.
[0078] In the description of the electronic devices for wireless communication in the
embodiments above, it is apparent that some processing or methods are also disclosed. In the
following, an overview of a method for wireless communication according to an embodiment
of the present disclosure is given without repeating some details already discussed above.
30 [0079] As shown in FIG. 4, the method according to this embodiment includes a step of
determining a data status of low priority traffic available for an uplink transmission (S410),
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and a step of generating, based on the data statue of the low priority traffic, scheduling
assistance information for a scheduler of a base station (S420). The scheduling assistance
information is related to a transmission of a user equipment on an unlicensed transmission
resource.
5 [0080] The previously described embodiments are used for user equipment side to generate
the scheduling assistance information to be provided to the base station. In addition,
embodiments of the present disclosure further include devices and methods for base station
side. Some details of the downlink data processing performed at base station side may be
similar to or correspond to the details of user equipment side. Therefore, in the following
10 description of the embodiments of the devices and methods on base station side, some details
which are discussed above are omitted. It should be understood that these specilic details are
similarly applicable to the processing performed at base station side.
[0081] As shown in FIG. 5, an electronic device 500 for wireless communication according
to an embodiment includes at least one processor 5 10.
15 [0082] The processor 510 is configured to assign an unlicensed transmission resource based
on scheduling assistance information regarding low priority traffic from a user equipment (the
assignment unit 511). The processor 510 is further configured to generate the scheduling
assignment information regarding the unlicensed transmission resource for transmission of the
user equipment (the generation unit 51 3).
20 [0083] More specifically, the scheduling assistance information may include a BSR. The
processor 510 may read the BSR, determine a data volume of low priority traffic available for
an uplink transmission in a buffer of the user equipment, and assign the unlicensed
transmission resource based on the data volume.
[0084] FIG. 6 illustrates an electronic device for wireless cominunication according to
25 another embodiment. An electronic device 600 includes at least one processor 610.
[0085] In addition to being configured to perform the functions described with reference to
FIG. 5 in the above (that is, the assignment unit 611 and the generation unit 613 are similar to
the assignment unit 511 and the generation unit 513), the processor 610 is further configured
to acquire an MAC protocol data unit from the user equipment, and determine, based on a
30 subhead of the MAC protocol data unit, that the MAC protocol data unit contains a MAC
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control element of a BSR regarding the low priority traffic so as to read the BSR (the
acquisition unit 615). The subhead may contain type information indicating that the MAC
control element is the BSR regarding the low priority iraffic.
[0086] Specifically, the acquisition unit 615 may read the BSR in the exemplary manner
5 described above with reference to FIG. 17 and FIG. 19, for example.
[0087] According to an embodiment, the electronic device for wireless communication is a
base station. As shown in FIG. 7, a base station 700 includes at least one processor 710 and a
receiver 720.
[0088] The processor 710 may be configured to perform functions similar to the functions
10 described above with reference to FIG. 5 (that is, the assignment unit 711 and the generation
unit 713 are similar to the assignment unit 511 and the generation unit 513, respectively).
[0089] The receiver 720 is configured to receive scheduling assistance information from a
user equipment or another base station serving the user equipment.
[0090] As described above, in a case that there is an uplink transmission in an LAA cell, the
15 LAA-SR of the user equipment can represent a request for a corresponding uplink
transmission resource of the LAA cell. In this case, the receiver 720 may receive the
scheduling assistance information from the user equipment. In another aspect, in a case that
there is no uplink transmission in the LAA cell, the transmission object of the LAA-SR of the
user equipment is a primary cell. In this case, the receiver 720 may receive scheduling
20 assistance information from another base station serving the user equipment. In a scenario of
carrier aggregation, for example, the primary cell is a Pcell. Ln a scenario of dual link, for
example, the primary cell is a Pcell or a PScell.
[0091] Next, examples of transmission processes in the above two cases are described wit11
reference to FIG. 20 and FIG. 21.
25 100921 As shown in FIG. 20, in a case that the LAA cell supports uplink transmission:
When UE: side needs to request for the uplinlc transmission resource of the LAA, in
ST2001, the UE transmits the SR via an uplink source of the LAA.
[0093] The UE side determines whether to transmit the SR directly via the PUCCH or
initiate a new RACH process, based on whether there is a PUCCH resource for transmitting
30 the SR or whether an upper limit of SR is reached (ST2003 is performed when necessary).
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[0094] Subsequently, in ST2005, the LAA base station performs uplink authorization for
the BSR to the UE.
[0095] Next, in ST2007, the UE transmits the BSR identifying low QoS traffic in the
DTCH, and transmits other assistance information such as geographical position information
5 in ST2009.
[0096] Upon reception of the information, the LAA base station determines whether to
assign an LAA resource to the UE, based on an occupancy condition of the LAA resource, a
volume of low priority traffic such as non-real time traffic of the UE and an interference
condition obtained from information such as a geographical position. If it is determined to
10 assign the transmission resource, the resource assignment information may be informed to the
UE via the primary cell or LAA cell (ST2011). As shown in FIG. 21, in a case that the LAA
cell does not support uplink transmission:
In ST2101 to ST2107, the UE side transmits the LAA-SR the BSR and other
assistance information to a base station of the primary cell using an uplink resource of the
15 primary cell.
[0097] Upon reception of the information, the base station of the primq cell needs to
generate X2 signaling containing the scheduling assistance information such as the LAA BSR
of the UE and transfer the information to the LAA base station by the X2 signaling (ST2109)
if the LAA base station is located in a different geographical position from the base station of
20 the primary cell (for example, the LAA base station has an independent scheduler).
I00981 AAer making a decision of resource assignment, the LAA base station may inform
the decision of resource assignment to the UE in two manners.
I00991 In a first manner, the decision of resource assignment is informed to the base station
of the primary cell via X2 signaling (in a case that the LAA base station is located in a
25 different geographical position from the base station of the primary cell) (ST21 1 I), and then
informed to the UE via the downlink control channel of the primary cell (ST2113).
[01001 In a second manner, the decision of resource assignment is directly informed to the
UE via the downlink control channel of the LAA (ST21 15).
[0101] Next, an overview of a wireless cominunication method for base station side
30 according to an embodiment of the present disclosure is given without repeating some details
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already discussed above.
[0102] As shown in FIG. 8, the method for wireless cominunication according to the
embodiment includes a step of assigning an unlicensed transmission resource based on
scheduling assistance information regarding low priority traffic from a user equipment (S8 1 O),
5 and a step of generating scheduling assignment information regarding the unlicensed
transmission resource for transmission of the user equipment (S820).
[0103] Next, a device and a method for terminal side of a wireless communication system,
and a device and a method for base station side of a wireless communication system
according to embodiments of the present disclosure are described with reference to FIG. 9 to
10 FIG. 12. It is to be noted that, some specific details in above-described embodiments is also
applicable to the following embodiments.
[0104] As shown in FIG. 9, a device 900 for terminal side of a wireless communication
system according to an embodiment includes an acquisition unit 910, a generation unit 920
and a transmission unit 930. Functions of various units may be implemented by a processor,
I5 and are not necessarily implemented by discrete actual components. Additionally, the
functions of various units may be distributed to multiple processors, so that the multiple
processors cooperate to perform these functions. The device 900 may be used in wireless
communication using an licensed frequency band.
[0105] The acquisition unit 910 is configured to acquire the data volume of low priority
20 traffic to be transmitted in a buffer of a logical channel of the device 900. The logical channel
may be a dedicated trafic channel.
[0106] The generation unit 920 is configured to include information regarding the data
volume into a BSR.
[0107j The transmission unit 930 is configured to transmit the BSR to a base station.
25 [0108] According to an embodiment, the generation unit 920 is further configured to
include information identifying the logical channel into the BSR.
[0109j More specifically, the generation unit 920 may be configured to indicate the BSR in
a subhead of a media access control packet data nnit (MAC PDU) carrying the BSR. For
example, the BSR may be indicated using a logical channel identifier (LCID) field in the
30 subhead.
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[0110] Additionally, the generation unit 920 may be configured to add a field of specific
bits in a control element (CE) of the MAC PDU carrying the BSR to indicate the BSR.
[0111] Further, the generation unit 920 may be configured to include the BSR regarding the
low priority traffic in the MAC CE, and generate a subhead of an MAC protocol data unit
5 corresponding to the MAC CE. The subhead contains type information indicating that the
MAC control element is the BSR regarding the low priority trafic.
[0112] The transmission unit 930 may trigger transmission of the BSR under a
predetermined triggering condition (for example, one of the several triggering conditions as
described above). Further, the transmission unit 930 may further bansmit other information,
10 for example, geographical position information of the device and an idle condition of
candidate channel in an unlicensed frequency band.
[0113] As shown in FIG. 10, a wireless communication method used by a device on
terminal side according to an embodiment includes a step of acquiring a data volume of low
priority traflic to be transmitted in a buffer of a logical channel of a device (SlOlO), a step of
15 including information regarding the data volume into a BSR (S1020), and a step of
transmitting the BSR to the base station (S1030).
[0114] As shown in FIG. 11, a device 1100 for base station side of a wireless
communication system according to an embodiment includes a reception unit 1110 and a
scheduling unit 1120.
20 [0115] The reception unit 1110 is configured to receive a BSR in which information
regarding a data volume of low priority traffic to be transmitted on a logical chai~nel of
terminal side device is included. Further, the reception unit 11 10 may further be configured to
receive other information such as geographical position information and an idle condition of
candidate channel in the unlicensed frequency band of the terminal side device.
25 [0116] The scheduling unit 1120 is configured to assign an uplink transmission resource to
the terminal side device based on the information regarding the data volume. For example, the
scheduling unit 1120 may assign an uplink transmission resource in an unlicensed frequency
band for the terminal side device in response to the reception of the BSR. Further, in a case
that the reception unit 1110 receives other information, the scheduling unit 1120 may perform
30 an assignment using other information.
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[0117] As shown in FIG. 12, a wireless communication method used by a device on base
station side according to an embodiment includes a step of receiving a BSR in which
information regarding a data volume of low priority traffic to be transmitted on a logical
channel of terminal side device is included (S1210). The method further includes a step of
5 assigning an uplink transmission resource for the terminal side device based on the
information regarding the data volume (S1220).
(0118) As an example, the steps of the above-described methods and constituent modules
and/or units of the above-described devices may he implemented as software, firmware,
hardware, or a combination thereof. In the case that they are implemented as software or
10 firmware, a program constituting the software for implementing the above-described methods
may be installed from a storage medium or a network to a computer (for example, the
general-purpose computer 1300 shown in FIG 13) having a dedicated hardware structure. The
computer can execute various functions when being installed with various programs.
[Oll9J In FIG 13, a computing processing unit (i-e., CPU) 1301 executes various
15 processing according to a program stored in a Read Only Memory @OM) 1302 or a program
loaded to a Random Access Memory (RAM) 1303 from a storage section 1308. In the RAM
1303, data required for the CPU 1301 in executing various processing and the like is also
stored as necessary. The CPU 1301, the ROM 1302 and the RAM 1303 are connected to each
other via a bus 1304. An inputloutput interface 1305 is also coimected to the bus 1304.
20 [0120] The following components are linked to the inputloutput interface 1305: an input
section 1306 including a keyboard, a mouse and the like, an output section 1307 including a
display such as a Cathode Ray Tube (CRT) and a Liquid Crystal Display (LCD), a speaker
and the like, the storage section 1308 including a hard disk and the like, and a communication
section 1309 including a network interface card such as a LAN card, a modem and the like.
25 The communication section 1309 performs communication processing via a network such as
the Internet. If necessary, a driver 13 10 may also be linked to the inpui/outpui interface 1305.
A removable medium 13 11 such as a magnetic disk, an optical disk, a magneto-optical disk, a
semiconductor memory and the like is mounted on the driver 13 10 as necessary such that a
computer program read out therefrom is installed in the storage section 1308.
30 101211 If the series of processing above is implemented by software, a program constituting
the software is installed from the network such as the Internet or the storage medium such as
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the removable medium 13 11.
[0122] It is understood by those skilled in the art that the storage medium is not limited to
the removable medium 1311 shown in FIG. 13 in which the program is stored and which is
distributed separately from the device so as to provide the program to the user. Examples of
5 the removable medium 1311 include a magnetic disk including a Floppy Disk (registered
trademark), an optical disk including a Compact Disk Read Only Memory (CD-ROM) and a
Digital Versatile Disc (DVD), a magneto-optical disk including a MiDisc (MD) (registered
trademark), and a semiconductor memory. Alternatively, the storage medium may be the
ROM 1302, a hard disk contained in the storage section 1308 or the like, in which the
10 program is stored, and which is distributed to the user together with the device containing the
storage medium.
I01231 Embodiments of the present disclosure further involve a program product having
stored therein machine-readable inshuction code. When the instruction code is read and
executed by the machine, the above-described methods according to the embodiments of the
15 present disclosure can be performed.
[0124] Correspondingly, the storage medium used for carrying the program product
including machine-readable instructions is also included in the present disclosure. The storage
medium includes but not limited to, a floppy diskette, an optical disk, a magneto-optical disk,
a memory card, a memory stick and so on.
20 101251 The embodiments of the present disclosure further relate to the following electronic
device. In a case that the electronic device is used for base station side, the base station may
be implemented as any type of evolved node B (eNB), such as a macro eNB and a small eNB.
The small eNB may be an eNB which covers a cell smaller than a macro cell, such as a pico
eNB, a micro eNB and a home (femto) eNB. Alternatively, the electronic device ]nay be
25 implemented as any other type of base station, such as a Node B and a base transceiver station
(BTS). The electronic device may include: a main body (also referred to as a base station
device) configured to control the wireless communication, and one or more remote radio
heads (RRI-I) provided at a different site from the main body. Further, various types of
terminals to be described hereinafter may serve as a base station by performing the function
30 of the base station temporarily or semi-permanently. Further, the electronic device on base
station side may also be a processing chip instead of an eNB entirety.
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101261 In a case that the electronic device is used for user equipment side, the electronic
device may be implemented as a mobile terminal (such as an smartphone, a tablet personal
computer (PC), a notebook PC, a portable game terminal, a portable/dongle mobile router and
a digital camera device) or an on-board terminal (such as a car navigation device). Further, the
5 electronic device may be a wireless communication module mounted on each of the above
terminals (such as the integrated circuit module including a single chip or multiple chips).
[0127] [Application example regarding a terminal device]
[0128] FIG. 14 is a block diagram illustrating an example of a schematic configuration of a
smartphone 2500 to which the technology according to the present disclosure is applicable.
10 The smartphone 2500 includes a processor 2501, a memory 2502, a storage 2503, an external
connection interface 2504, a camera 2506, a sensor 2507, a microphone 2508, an input
apparatus 2509, a display apparatus 2510, a speaker 2511, a radio communication interface
2512, one or more antenna switches 2515, one or more antennas 2516, a bus 2517, a battery
251 8, and an auxiliary controller 2519.
15 101291 The processor 2501 may be, for example, a CPU or a system on a chip (SoC), and
controls functions of an application layer and another layer of the smartphone 2500. The
memory 2502 includes RAM and ROM, and stores a program that is executed by the
processor 2501 and data. The storage 2503 may include a storage medium such as a
semiconductor memory and a hard disk. The external connection interface 2504 is an
20 interface for connecting an external device (such as a memory card and a universal serial bus
(USB) device) to the smartphone 2500.
[0130] The camera 2506 includes an image sensor (such as a charge coupled device (CCD)
and a complementary metal oxide semiconductor (CMOS)), and generates a captured image.
The sensor 2507 may include a group of sensors such as a measurement sensor, a gyro sensor,
25 a geomagnetic sensor, and an acceleration sensor. The microphone 2508 converts sounds that
are inputted to the smartphone 2500 to audio signals. The input apparatus 2509 includes, for
example, a touch sensor configured to detect touch on a screen of the display apparatus 2510,
a keypad, a keyboard, a button, or a switch, and receives an operation or information inputted
from a user. The display apparatus 2510 includes a screen (such as a liquid crystal display
30 (LCD) and an organic light-emitting diode (OLED) display), and displays an output image of
the smartphone 2500. The speaker 2511 converts audio signals that are outputted fiom the
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smartphone 2500 into sounds
[0131] The radio communication interface 2512 supports any cellular communication
scheme (such as LET and LTE-Advanced), and performs wireless communication. The radio
communication interface 2512 may typically include, for example, a BB processor 2513 and
5 an FG circuit 2514. The BB processor 2513 may perform, for example, encodingldecoding,
modulatingldemodulating, and multiplexingldemultiplexing, and performs various types of
signal processing for wireless communication. Meanwhile, the RF circuit 2514 may include,
for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via
the antenna 2516. The radio communication interface 2512 may be a chip module having the
10 BB processor 2513 and the RF circuit 2514 integrated thereon. The radio communication
interface 2512 may include multiple BB processors 2513 and multiple RF circuits 2514, as
illustrated in FIG .14. Although FIG. 13 illustrates the example in which the radio
communication interface 25 12 includes multiple BB processors 25 13 and multiple RF circuits
25 14, the radio communication interface 25 12 may also include a single BB processor 25 13
15 or a single RF circuit 2514.
101321 Furthermore, in addition to a cellular communication scheme, the radio
communication interface 25 12 may support another type of wireless communication scheme
such as a short-distance wireless communication scheme, a near field communication scheme,
and a radio local area network (LAN) scheme. In that case, the radio communication interface
20 2512 may include the BB processor 2513 and the RF circuit 2514 for each wireless
communication scheme.
[0133] Each of the antenna switches 2515 switches connection destinations of the antennas
2516 among multiple circuits (such as circuits for different wireless communication schemes)
included in the radio communication interface 25 12.
25 101341 Each of the antennas 2516 includes a single or multiple antenna elements (such as
multiple antenna elements included in an MIMO antenna), and is used for the radio
communication interface 2512 to transmit and receive radio signals. The smartphone 2500
may include the multiple antennas 2516, as illustrated in FIG. 14. Although FIG. 14 illustrates
the example in which thc smartphone 2500 includes multiple antennas 2516, the smartphone
30 2500 may also include a single antenna 25 16.
lo1351 Furthermore, the smartphone 2500 may include the antenna 2516 for each wireless
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communication scheme. In that case, the antenna switches 1215 may be omitted from the
configuration of the smartphone 2500.
[0136] The bus 2517 connects the processor 2501, the memory 2502, the storage 2503, the
external connection interface 2504, the camera 2506, the sensor 2507, the microphone 2508,
5 the input apparatus 2509, the display apparatus 2510, the speaker 2511, the radio
communication interface 2512, and the auxiliq controller 2519 to each other. The battery
2518 supplies power to blocks of the smartphone 2500 illustrated in FIG. 14 via feeder lines,
which are partially shown as dashed lines in the drawing. The auxiliary controller 2519
operates a minimum necessary function of the smartphone 2500, for example, in a sleep
10 mode.
101371 In the smartphone 2500 illustrated in FIG. 14, the communication unit 320 described
with reference to FIG. 3 and the transmitting unit 930 described with reference to FIG. 9 may
be implemented by the radio communication interface 25 12. At least a part of the functions of
the processor and the units described with reference to FIG. 1 to FIG. 3 and FIG 9 may also be
15 implemented by the processor 2501 or the auxiliary controller 2519. For example, power
consumption of the battery 2518 may be reduced by performing a part of functions of the
processor 2502 by the auxiliary controller 2519. Further, the processor 2501 or the auxiliary
controller 2519 may execute at least a part of functions of the processor and the units
described with reference to FIG. 1 to FIG. 3 and FIG. 9 by executing the program stored in the
20 memory 2502 or the storage 2503.
[0138] [Application example regarding a base station]
[0139] FIG. 15 is a block diagram illustrating a first example of a schematic configuration
of an eNB to which the technology according to the present disclosure is applicable. An eNB
2300 includes one or more antennas 23 10 and a base station device 2320. The base station
25 device 2320 and each antenna 2310 may be connected with each other via RF cable.
[0140] Each of the antennas 2310 includes one or more antenna elements (such as the
multiple antenna elements included in the multiple-input multiple-output (MIMO) antenna),
and is used for transmilting and receiving the radio signal by the base station device 2320. As
show in FIG. 15, the eNB 2300 may include multiple antennas 2310. For example, the
30 multiple antennas 2310 may be compatible with the multiple frequency bands used by the
eNB 2300. Although FIG. 15 shows an example in which the eNB 2300 includes multiple
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antennas 23 10, the eNB 2300 may also include a single antenna 23 10
[Ill411 The base station device 2320 includes a controller 2321, a memory 2322, a network
interface 2323 and a radio communication interface 2325.
[0142] For example, the controller 2321 may be a CPU or DSP, and performs various
5 functions of higher layers of the base station device 2320. For example, the controller 2321
generates a data packet based on the data in the signal processed by the radio communication
interface 2325, and transfers the generated packet via the network interface 2323. The
controller 2321 may bundle data from multiple baseband processors to generate bundled
packet, and transfers the generated bundled packet. The controller 2321 may have logical
10 function to perform the control such as radio resource control, radio bearer control, mobility
management, admission control and scheduling. The control may be performed in conjunction
with the neighboring eNB or a core network node. The memory 2322 includes RAM and
ROM, and stores the program to be performed by the controller 2321 and various types of
control data (such as a terminal lisi, transmission power data and scheduling data).
15 [Ill431 The network interface 2323 is a communication interface for connecting the base
station device 2320 to the core network 2324. The controller 2321 may communicate with the
core network node or another eNB via the network interface 2323. In this case, the eNB 2300
and the core network node or another eNB may be connected with each other via a logic
interface (such as S1 interface and X2 interface). The network interface 2323 may also be a
20 wired communication interface or a wireless communication interface for wireless backhaul
routing. If the network interface 2323 is a radio communication interface, the network
interface 2323 may use a higher frequency band for wireless communication as compared
with that used by the radio communication interface 2325.
[0144] The radio communication interface 2325 supports any cellular communication
25 scheme (such as the long term evolution (LTE) and the LTE-Advanced), and provides a
wireless connection to a terminal located in the cell of the eNB 2300 via the antenna 2310.
The radio communication interface 2325 may generally include for example a base band (BB)
processor 2326 and a RF circuit 2327. The BB processor 2326 may perform for example
encodingldecoding, inodulation/demodulation and multiplexinglde-multiplexing, and
30 performs various types of signal processes of the layer (for example L1, media access control
(MAC), radio link control (RLC) and packet data convergence protocol (PDCP)). In place of
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the controller 2321, the BB processor 2326 may have some or all of the above logical
functions. The BB processor 2326 may be a memory storing the communication control
program, or a module including a processor and related circuit configured to perform the
program. An updating program may change the function of the BB processor 2326. The
s module may be a card or blade included into the slot of the base station device 2320.
Alternatively, the module may be a chip mounted on the card or the blade. Meanwhile, the W
circuit 2327 may include for example a mixer, a filter and an amplifier, and transmit and
receive a wireless signal via the antenna 23 10.
101451 As shown in FIG. 15, the radio communication interface 2325 may include multiple
10 BB processors 2326. For example, the multiple BB processors 2326 may be compatible with
the multiple frequency bands used by the eNB 2300. As shown in FIG. 15, the radio
communication interface 2325 may include multiple RF circuits 2327. For example, the
multiple RF circuits 2327 may be compatible with multiple antenna elements. Although an
example in which the radio communicalion interface 2325 includes multiple BB processors
15 2326 and multiple RF circuits 2327 is shown in FIG 15, the radio communication interface
2325 may include a single BB processor 2326 and a single RF circuit 2327.
[0146] In the eNB 2300 illustrated in FIG. 15, the transceiver 720 described with reference
to FIG. 7 and the reception unit 11 10 described with reference to FIG. 11 may be implemented
by the radio communication interface 2325. At least a part of the functions of the processor
20 described with reference to FIG. 5 to FIG. 7 and FIG. 11 and the units may also be
implemented by the controller 2321. For example, the controller 2321 may execute at least a
part of functions of the processor and the units described by using FIG. 5 to FIG. 7 and FIG. 11
by executing the program stored in the memory 2322.
[0147] In the above description of specific embodiments of the present disclosure, the
25 features described and/or illustrated with respect to one embodiment may be used in one or
more other embodiments in the same or similar manner as or to that in the embodiment, in
combination with features in other embodiments, or replacing features in other embodiments.
I01481 It is to be emphasized that the term "comprisingiincluding" as used herein refers to
the presence of a feature, element, step or component but does not exclude the presence or
30 addition of one or more other features, elements, steps or components.
I01491 In the above embodiments and examples, reference numbers consist of numbers are
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used to represent each step andlor unit. It will be understood by those skilled in the ad that
these reference numbers are used for convenience of description and illustration only and are
not intended to represent order or any other limit thereof.
[0150] In addition, the method of the present disclosure is not limited to be performed in a
5 chronological order described in the specification, but may also be performed in other
time-sequentially, in parallel, or independently. Therefore, the order of execution of the
methods described in this specification does not limit the technical scope of the present d.
[0151] Although the disclosure has been described above with respect to specific
embodiments thereof, it is to be understood that all of the embodiments and examples
10 described above are illustrative and not restrictive. Various modifications, improvements or
equivalents of the present disclosure may be designed by those skilled in the art from the
spirit and the scope of the appended claims. Such modifications, improvements or equivalents
are intended to be included within the scope of protection of the present disclosure.

CLAIMS
1. An electronic device for wireless communication, comprising:
at least one processor configured to
5 determine a data status of low priority trafflc available for an uplink transmission; and
generate, based on the data status of the low priority traffic, scheduling assistance
information for a scheduler of a base station, the scheduling assistance information being
related to a transmission of a user equipment on an unlicensed transinission resource.
10 2. The electronic device according to claim 1, wherein the scheduling assistance
information comprises a buffer status report, and the at least one processor is configured to
determine a data volume of low priority traffic available for an uplink transmission in a buffer,
and include, in the buffer status report, indication information of the data volume of the low
priority traffic, for use by the scheduler of the base station.
3. The electronic device according to claim 2, wherein the at least one processor is
further configured to include, in the buffer status report, identification information of a logical
channel andlor a logical channel group to which the low priority traffic belongs, the logic
channel comprising a dedicated traffic channel.
4. The electronic device according to claim 2 or 3, wherein the at least one processor is
further configured to include, in a media access control MAC control element, a buffer status
report regarding the low priority traffic, and generate a subhead of MAC protocol data unit
corresponding to the MAC control element, the subhead containing type information
25 indicating that the MAC control element is a buffer status report regarding low priority traffic.
5. The electronic device according to claim 4, wherein the type information is indicated
by a logical channel identification in ihe subhead, and an index value of a respective logical
channel identification is one of binary values 01011 to 11000.
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6. The electronic device according to any one of claims 1 to 3, wherein the low priority
traffic comprises traac with a low requirement on quality of service.
5 7. The electronic device according to any one of claims 1 to 3, wherein the at least one
processor is further configured to map, based on scheduling assignment information of the
scheduler of the base station, data of the low priority traffic to a corresponding unlicensed
transmission resource, for transmitting to the base station.
10 8. The electronic device according to any one of claims 1 to 3, wherein the scheduling
assistance information further comprises at least one of: geographical position information of
the user equipment, an idle condition of candidate channel on the unlicensed transmission
resource, and a channel quality of a candidate channel on the unlicensed transmission
resource.
9. The electronic device according to any one of claims 1 to 3, wherein the electronic
device is a user equipment, the at least one processor is furiher configured to select a
transmission resource for transmitting the scheduling assistance information based on
availability of a transmission resource from the user device to the base station, and the
20 electronic device hrther comprises a transmitter configured to transmit the scheduling
assistance information via the selected transmission resource.
10. A method for wireless communication, comprising:
determining a data status of low priority traffic available for an uplink transmission; and
25 generating, based on the data status of the low priority traffic, scheduling assistance
information for a scheduler of a base station, the scheduling assistance information being
related to a transmission of a user equipment on an unlicensed transmission resource.
YIRef: CNPA140441N00
OIRef OP1715-06-1032
Original
11. An electronic device for wireless communication, comprising:
at least one processor configured to
assign an unlicensed transmission resource based on scheduling assistance information
regarding low priority trafec from a user equipment; and
5 generate scheduling assignment information regarding the unlicensed transmission
resource, for a transmission of the user equipment.
12. The electronic device according to claim 11, wherein the scheduling assistance
information comprises a buffer status report, the at least one processor is configured to read
10 the buffer status report, determine a data volume of low priority traffic available for an uplink
transmission in a buffer of the user equipment, and assign the unlicensed transmission
resource based on the data volume.
13. The electronic device according to claim 12, wherein the at least one processor is
15 further configured to acquire an MAC protocol data unit from the user equipment, and
determine, based on a subhead of the MAC protocol data unit, that the MAC protocol data
unit contains an MAC control element of a buffer status report regarding the low priority
traffic, so as to read the buffer status report, wherein the subhead contains type information
indicating that the MAC control element is a buffer status report regarding low priority traffic.
14. The electronic device according to any one of claims I 1 to 13, wherein the electronic
device is a base station, and the base station further coinprises a receiver configured to receive
the scheduling assistance information from the user equipment or another base station serving
the user equipment.
15. A method for wireless communication, comprising:
assigning an unlicensed hansmission resonrce based on scheduling assistance
information regarding low priority traffic from a user equipment; and
YIRef: CNPA14044IN00
OIRef OP1715-06-1032
Original
generating scheduling assignment information regarding the unlicensed transmission
resource, for a transmission of the user equipment.
16. A device for terminal side of a wireless communication system, comprising:
5 an acquisition unit configured to acquire a data volume of low priority traffic to be
transmitted in a buffer of a logical channel of the device;
a generation unit configured to include information regarding the data volume into a
buffer status report; and
a transmission unit configured to transmit the buffer status report to a base station.
10
17. The device according to claim 16, wherein the generation unit is further configured
to include information identifying the logical channel into the buffer status report.
18. The device according to claim 16, wherein the logical channel is a dedicated traffic
15 channel.
19. The device according to any one of claims 16 to 18, wherein the generation unit is
configured to indicate the buffer status report in a corresponding subhead of a media access
control packet data unit carrying the buffer status report.
20. The device according to claim 19, wherein the generation unit is configured to
indicate the buffer status report using a logical channel identifier field in the subhead.
21. The device according to any one of claims 16 to 18, wherein the generation unit is
25 configured to add a field of specific hits in a control element of the media access control
protocol data unit carrying the buffer status report, to indicate the bulfer status report.
YRef: CNPA140441N00
ORef OP1715-06-1032
Original
22. The device according to any one of claims 16 to 18, wherein the generation unit is
configured to include, in a media access control MAC control element, a buffer status report
regarding the low priority traffic, and generate a subhead of MAC protocol data unit
corresponding to the MAC control element, the subhead containing type information
5 indicating that the MAC control element is a buffer status report regarding low priority traffic.
23. The device according to any one of claims 16 to 18, wherein the device is configured
to be used in wireless communication using an unlicensed hequency band.
10 24. The device according to any one of claims 16 to 18, wherein the transmission unit is
configured to perform the transmission with one of the following cases as a triggering
condition:
a) a resource request for requesting an uplink channel resource in the unlicensed
frequency band has been transmitted by the device;
15 b) there is low priority traffic data to be transmitted in the corresponding channel; and
c) a timer for regularly performing the transmission expires.
25. The device according to any one of claims 16 to 18, wherein the transmission unit is
further configured to transmit other information which comprises at least one of: geographical
20 position information of the device and an idle condition of candidate channel in the
unlicensed frequency band.
26. A wireless communication method used by a device on terminal side, comprising:
acquiring a data volume of low priority traffic to be transmitted in a buffer of a logical
25 channel of the device:
including information regarding the data volume into a buffer status report; and
transmitting the buffer status report to a base station.
Y/P,ef. ChPA 14044iT~I00
O/Kef OP1715-06-1032
Original
27. A device for base staiio~sli de of a ~wirelcssc omnu~aications ystem, comprising:
a reception unit coilfigured to receive a buffer- status report in which information
regarding a data volume ol' low priority traffic lo be trailsmitted on a logical channel of a
terminal side device is included; and
5 a scheduling unit configured to assign an upliumlc bansmission resource for the terminal
side device based on the infore~la.tiwnre gardiilg the data vvolu~ne.
28. The device accordiilg to ciairi 27, wherein the scheduling unit is configured to assign,
iil response to a reception of the buEer stabs repoi?, an uplinlc transmission resource in ail
!O ~mYice~iselid- equency band for ,the temliilal side devii:e.
29. The device according to claiiil 2R, whereiil tlii reception unit is furt11er configured to
receive other information which comprises at least one oi: geographical position infolmation
of the teiminal side device and an idle condition of candidate channel in the unlicensed
15 fi.equency band.
30. The device accordiiig to claim 29, whereiil the scheduling unit further performs the
assigmient using the other information.
20 3 1. A wireless cornmui~icationm ethod used by a device on base station side, comprising:
receiving a buffer status report in which idonnation regarding a data volume of low
priority traffic to be transmitted on a logical channel of a terminal side device is included; and
assigning an uplink trai~sniission resource for the terminal side device based on the
information regarding the data volume.