Method and Apparatus for Optimizing a User Plan
Operation in a Communication System based on Carrier
Aggregation
Field Of The Invention
[0001] The present invention relates to a wireless communication system,
more particularly, to a wireless communication system based on carrier
aggregation (CA).
Background Of The Invention
[0002] In LTE-A, wider bandwidth, up to 100M will be used to satisfy the
higher data rate requirement. For backward compatibility, this 100M
bandwidth will be separated into multiple carrier components. Each
carrier component has the maximum bandwidth of 20M. Therefore, five
carrier components can be used for the user equipments in LTE-A.
[0003] Now 3rd Generation Partnership Project has agreed with the
application of the downlink carrier component activation/deactivation
concept basically. That is, when a base station decides not to use an
activated carrier component, it de-activates the downlink carrier
component and informs a user equipment to enable the user equipment not
to monitor PDCCH on this carrier component so as to achieve the power
saving purpose.
[0004] Additionally, according to the agreement achieved by 3GPP, the
downlink carrier component de-activation/activation command is sent to a
user equipment by a MAC CE signaling from a base station.
[0005] For the carrier aggregation technology, another important agreement
achieved by 3GPP is that for any one of the downlink carrier component/
the uplink carrier component, there is a downlink carrier component
associated therewith, to be responsible for sending the downlink
assignment/uplink grant information of the downlink carrier component/
the uplink carrier component. And those associated information is sent to
a user equipment through a radio resource control signaling (RRC
signaling) from a base station.
[0006] From the perspective of a user equipment, there are two events which
results that a downlink carrier component is not useable. Event 1: a RRC
signaling is received from a base station to indicate that a downlink
carrier component is de-configured; Event 2 : a MAC CE signaling is
received form a base station to indicate that a downlink carrier component
is de-activated.
[0007] The difference of these two events is that, event 1 means a user
equipment will be no longer perform downlink measurement on the
de-configured carrier component; and event 2 means a user equipment
will still continue to perform mobility relevant measurement on the
de-activated downlink carrier component. But the similarity for these two
events is that the user equipment will be no longer to monitor PDCCH
channel on this downlink carrier component and to execute PDSCH
operation, which will result in the occurrence of the following problems:
[0008] 1) For the downlink carrier component, the user plan operation at the
user equipment side will be affected, because the reception related to this
downlink carrier component is stopped;
[0009] 2) If the downlink carrier component is associated with other at least
one downlink carrier component/uplink carrier component, for example,
the downlink carrier component is responsible for sending downlink
assignment/uplink grant information of the at least one associated
downlink carrier component and uplink carrier component, then, since the
user equipment can no longer receive those downlink assignment/uplink
grant information associated with the downlink carrier component and the
uplink component, the use of those associated downlink carrier
components/uplink carrier components will be affected.
[0010] In the prior art, a scheme for reducing the impact on a user plan
operation when a downlink carrier component is de-activated is provided.
Its main point is that a user equipment delays the de-activation
implementation until all pending HARQ transmissions and
retransmissions on the de-activated downlink carrier component end when
it receives the de-activation command from a base station, so as to avoid
data loss and reduce the impact of the HARQ re-ordering procedure. But
there are following disadvantages in the scheme, that is,
de-synchronization on the de-activated downlink carrier component status
between a user equipment and a base station may occur, and the base
station has to schedule further transmission on the de-activated carrier
component.
Detailed Description Of The Invention
[0011] Based on the problems described above, a method for optimizing a
user plan operation in a user equipment of a wireless communication
system based on carrier aggregation is provided in an embodiment of the
present invention, wherein, the method comprises the following steps:
firstly, a user equipment receives a downlink carrier component removal
signaling from a base station, wherein the downlink carrier component
removal signaling is used to indicate a removed downlink carrier
component; secondly, the user equipment, according to the downlink
carrier component removal signaling, stops the pending HARQ
procedures of the removed downlink carrier component and flushes the
HARQ receiving buffer related to the removed downlink carrier
component and/or stops a re-ordering procedure and/or generates a status
report and sends the status report to the base station, wherein the status
report is used to indicate the base station to perform retransmission and
inform the base station of the data needed to be retransmitted.
[0012] Optionally, when the downlink carrier component removal signaling is
a MAC CE signaling, firstly, the user equipment receives the MAC CE
signaling from the base station in layer 2, the MAC CE signaling being
used to indicate a de-activated downlink carrier component; then the user
equipment, according to the MAC CE signaling, indicates layer 1 to stop
the pending HARQ procedures of the de-activated downlink carrier
component and indicates layer 1 or layer 2 to flush the HARQ receiving
buffer related to the de-activated downlink carrier component and/or
indicates layer 2 to stop a re-ordering procedure and/or indicates layer 2
to generate a status report and send the status report to the base station,
wherein the status report is used to indicate the base station to perform
retransmission in layer 2 and inform the base station of the data needed to
be retransmitted.
[0013] Optionally, when the downlink carrier component removal signaling is
a RRC signaling, firstly, the user equipment receives the RRC signaling
from the base station in layer 3, the RRC signaling being used to indicate
a de-configured downlink carrier component; then the user equipment,
according to the RRC signaling, indicates layer 1 to stop the pending
HARQ procedures of the de-configured downlink carrier component and
indicates layer 1 or layer 2 to flush the HARQ receiving buffer related to
the de-configured downlink carrier component and/or indicates layer 2 to
stop a re-ordering procedure and/or indicates layer 2 to generate a status
report and send the status report to the base station, wherein the status
report is used to indicate the base station to perform retransmission in
layer 2 and inform the base station of the data needed to be retransmitted.
[0014] By applying the above technology scheme, the user plan operation at
the user equipment side can be optimized, when a downlink carrier
component is de-activated or de-configured.
[0015] Optionally, when the de-configured downlink carrier component is
further used to send the user equipment downlink assignment information
related to at least one associated downlink carrier component associated
with the de-configured downlink carrier component and uplink grant
information related to at least one associated uplink carrier component
associated with the de-configured downlink carrier component, the
method further comprising: a user equipment determines whether
information about a replaced downlink carrier component is included in
the RRC signaling; the user equipment receives the downlink assignment
information related to at least one associated downlink carrier component
associated with the de-configured downlink carrier component and the
uplink grant information related to at least one associated uplink carrier
component associated with the de-configured downlink carrier component
on the replaced downlink carrier component, if the information about the
replaced downlink carrier component is included in the RRC signaling;
the user equipment indicates layer 1 to stop relevant measurements
performed on the at least one associated downlink carrier component and
indicates layer 1 to stop transmitting a sounding reference signal on the at
least one associated uplink carrier component, if the information about the
replaced downlink carrier components is not included in the RRC
signaling; and indicates layer 1 to stop the pending HARQ procedures of
the at least one associated downlink carrier component and indicates layer
1 or layer 2 to flush the HARQ receiving buffer related to the at least one
associated downlink carrier component and/or indicates layer 2 to stop a
re-ordering procedure and/or indicates layer 2 to generate a status report
and send the status report to the base station, wherein the status report is
used to indicate the base station to perform retransmission and inform the
base station of the data needed to be retransmitted; and indicates layer 1
to stop the pending HARQ procedures of the at least one associated uplink
carrier component and indicates layer 2 to flush the HARQ receiving
buffer related to the at least one associated uplink carrier component,
and/or indicates layer 2 to perform retransmission.
16] Optionally, when the de-activated downlink carrier component is
further used to send the user equipment downlink assignment information
related to at least one associated downlink carrier component associated
with the de-activated downlink carrier component and uplink grant
information related to at least one associated uplink carrier component
associated with the de-activated downlink carrier component, the method
further comprising: a user equipment extracts status information from the
received MAC CE signaling, wherein the status information includes the
status of at least one associated downlink carrier component associated
with the de-activated downlink carrier component; the user equipment
indicates layer 1 to stop relevant measurements performed on at least one
hit downlink carrier component, if the at least one hit downlink carrier
component of the at least one associated downlink carrier component is in
the de-activated status; and indicates layer 1 to stop the pending HARQ
procedures of the at least one hit downlink carrier component and
indicates layer 1 or layer 2 to flush the HARQ receiving buffer related to
the at least one hit downlink carrier component and/or indicates layer 2 to
stop a re-ordering procedure and/or indicates layer 2 to generate a status
report and send the status report to the base station, wherein the status
report is used to indicate the base station to perform retransmission and
inform the base station of the data needed to be retransmitted.
17] Optionally, the method further comprises: a user equipment
determines whether the status information included in the MAC CE
signaling further includes status of at least one associated uplink carrier
component associated with the de-activated downlink carrier component,
or determines whether status information of the uplink carrier component
is received from the base station in the same TTI, the status information
of the uplink carrier component includes status of at least one associated
uplink component carrier associated with the de-activated downlink
carrier component; the user equipment indicates layer 1 to stop
transmitting a sounding reference signal on at least one hit uplink carrier
component, if the status information included in the MAC CE signaling
further includes the status of at least one associated uplink carrier
component associated with the de-activated downlink carrier component,
or the status information of the uplink carrier component is received from
the base station in the same TTI and at least one hit downlink carrier
component of the at least one associated downlink carrier component is in
the de-activated status; and indicates layer 1 to stop the pending HARQ
procedures of the at least one hit uplink carrier component and indicates
layer 2 to flush the HARQ receiving buffer related to the at least one hit
uplink carrier component, and/or indicates layer 2 to perform
retransmission. The user equipment indicates layer 1 to stop transmitting a
sounding reference signal on the at least one associated uplink carrier
component, if the status information included in the MAC CE signaling
does not include the status of at least one associated uplink carrier
component associated with the de-activated downlink carrier component,
or the status information of the uplink carrier component is not received
from the base station in the same TTI; and indicates layer 1 to stop the
pending HARQ procedures of the at least one associated uplink carrier
component and indicates layer 2 to flush the HARQ receiving buffer
related to the at least one associated uplink carrier component, and/or
indicates layer 2 to perform retransmission.
[0018] By applying the above technology scheme, the user plan operation at
the user equipment side can not only be optimized, the impact on at least
one associated downlink carrier component and at least one associated
uplink carrier component associated with the de-activated/de-configured
downlink carrier component can be reduced or eliminated as well.
[0019] A method for assisting a user equipment to optimize a user plan
operation in a base station of a wireless communication system based on
carrier aggregation is provided in another embodiment of the present
invention, wherein the method comprises the following steps: firstly a
base station re-configures an activated downlink carrier component as a
replaced downlink carrier component; then the base station inserts
information of the replaced downlink carrier component to a RRC
signaling, wherein the RRC signaling is used to indicate a de-configured
downlink carrier component and a replaced downlink carrier component,
the replaced downlink carrier component is used to replace the
de-configured downlink carrier component and send downlink assignment
of at least one associated downlink carrier component associated with the
de-configured downlink carrier component and uplink grant of at least one
associated uplink carrier component associated with the de-configured
carrier to the user equipment; finally, the base station sends the RRC
signaling to the user equipment.
[0020] An optimizing apparatus for optimizing a user plan operation in a user
equipment of a wireless communication system based on carrier
aggregation is provided in an embodiment of the present invention,
wherein the optimizing apparatus comprises: a first receiving means, for
receiving a downlink carrier component removal signaling from a base
station, wherein the downlink carrier component removal signaling is
used to indicate a removed downlink carrier component; a first indicating
means, for according to the downlink carrier component removal
signaling, stopping the pending HARQ procedures of the removed
downlink carrier component and flushing the HARQ receiving buffer
related to the removed downlink carrier component and/or stopping a
re-ordering procedure and/or generating a status report and sending the
status report to the base station, wherein the status report is used to
indicate the base station to perform retransmission and inform the base
station of the data needed to be retransmitted.
[0021] An assisting optimizing apparatus for assisting a user equipment to
optimize a user plan operation in a base station of a wireless
communication system based on carrier aggregation is provided in another
embodiment of the present invention, wherein the assisting optimizing
apparatus comprises: a configuring means, for re-configuring an activated
downlink carrier component as a replaced downlink carrier component; an
inserting means, for inserting information of the replaced downlink carrier
component to a RRC signaling, wherein the RRC signaling is used to
indicate a de-configured downlink carrier component and a replaced
downlink carrier component, the replaced downlink carrier component is
used to replace the de-configured downlink carrier component and send
downlink assignment of at least one associated downlink carrier
component associated with the de-configured downlink carrier component
and uplink grant of at least one associated uplink carrier component
associated with the de-configured carrier to the user equipment; a sending
means, for sending the RRC signaling to the user equipment.
[0022] The respective aspects of the present invention will be more apparent
through the detailed illustration of the embodiments in the following.
Description of Drawings
[0023] With reference to the following detailed description of the
non-restrictive embodiments, other features, objects and advantages of the
present invention will be more apparent;
[0024] FIG.l shows a flow chart of a method for optimizing a user plan
operation in a user equipment of a wireless communication system based
on carrier aggregation according to an embodiment of the present
invention;
[0025] FIG.2 shows a flow chart of a method for assisting a user equipment to
optimize a user plan operation in a base station of a wireless
communication system based on carrier aggregation according to an
embodiment of the present invention;
[0026] FIG.3 shows a block diagram of an optimizing apparatus for
optimizing a user plan operation in a user equipment of a wireless
communication system based on carrier aggregation according to an
embodiment of the present invention;
[0027] FIG.4 shows a block diagram of an assisting optimizing apparatus for
assisting a user equipment to optimize a user plan operation in a base
station of a wireless communication system based on carrier aggregation
according to an embodiment of the present invention;
[0028] Wherein, through different figures, same or similar reference numerals
refer to corresponding features
Detailed Description of Embodiments
[0029] With reference to the figures, the technology scheme of the present
invention will be described in detail.
[0030] FIG.l shows a flow chart of a method for optimizing a user plan
operation in user equipment 10 of a wireless communication system based
on carrier aggregation according to an embodiment of the present
invention.
[0031] Firstly, in step Sll, user equipment 10 receives a downlink carrier
component removal signaling from base station 20.
[0032] The downlink carrier component removal signaling is used to indicate
a removed downlink carrier component. Optionally, the downlink carrier
component removal signaling is a MAC CE (MAC control element)
signaling, being used to indicate a de-activated downlink carrier
component; or the downlink carrier component removal signaling is a
RRC signaling, being used to indicate a de-configured downlink carrier
component.
[0033] Generally, when the downlink data queue at base station 20 side runs
empty, base station 20 will de-activate a downlink carrier component.
After base station 20 determines to de-activate a downlink carrier
component, base station 20 will put the information of the de-activated
downlink carrier component into a MAC CE signaling, and send the MAC
CE signaling to user equipment 10 through any of the other downlink
carrier components in the activated status. After user equipment 10
receives the MAC CE signaling from base station 20, user equipment 10
can know which downlink carrier component is de-activated according to
the information of the de-activated downlink carrier component included
in the MAC CE signaling.
[0034] Then, in step SI2, user equipment 10, according to the received
downlink carrier component removal signaling, stops the pending HARQ
procedures of the removed downlink carrier component and flushes the
HARQ receiving buffer related to the removed downlink carrier
component and/or stops a re-ordering procedure and/or generates a status
report and sends the status report to base station 20. The status report is
used to indicate base station 20 to perform retransmission and inform base
station 20 of the data needed to be retransmitted.
[0035] Since user equipment 10 sends the status report to base station 20
immediately after it receives the downlink carrier component removal
signaling, this can trigger base station 20 to perform retransmission early,
so as to reduce the impact on QoS due to data loss.
[0036] Optionally, when the downlink carrier component removal signaling is
a MAC CE signaling, after user equipment 10 receives the MAC CE
signaling from base station 20 in layer 2, for example, MAC layer, user
equipment 10 indicates layer 1, for example, physical layer, to stop the
pending HARQ procedures of the de-activated downlink carrier
component and indicates layer 2, for example, MAC layer, to flush the
HARQ receiving buffer related to the de-activated downlink carrier
component and/or indicates layer 2, for example, RLC layer, to stop a
re-ordering procedure and/or indicates layer 2 , for example, RLC layer,
to generate a status report. The status report is used to indicate base
station 20 to perform retransmission in layer 2, for example, RLC layer,
and inform base station 20 of the data needed to be retransmitted.
[0037] It should be noted, that in the different systems, the HARQ receiving
buffer can be located in layer 1, for example, physical layer, or in layer 2,
for example, MAC layer. It is understandable for those skilled in the art,
that when the HARQ receiving buffer is located in layer 1, for example,
physical layer, user equipment 10 indicates the physical layer to flush the
HARQ receiving buffer related to the de-activated downlink carrier
component; and when the HARQ receiving buffer is located in layer 2, for
example, MAC layer, user equipment 10 indicates the MAC layer to flush
the HARQ receiving buffer related to the de-activated downlink carrier
component.
[0038] Optionally, when the downlink carrier component removal signaling is
a RRC signaling, after user equipment 10 receives the RCC signaling
from base station 20 in layer 3, for example, RCC layer, user equipment
10 indicates layer 1, for example, physical layer, to stop the pending
HARQ procedures of the de-configured downlink carrier component and
indicates layer 2, for example, MAC layer, to flush the HARQ receiving
buffer related to the de-configured downlink carrier component and/or
indicates layer 2, for example, RLC layer, to stop a re-ordering procedure
and/or indicates layer 2, for example, RLC layer, to generate a status
report. The status report is used to indicate base station 20 to perform
retransmission in layer 2, for example, RLC layer, and inform base station
20 of the data needed to be retransmitted.
[0039] After base station 20 receives the status report from user equipment 10,
it performs data retransmission in layer 2, for example, RLC layer,
according to the data needed to be retransmitted indicated in the status
report.
[0040] Certainly, after base station 20 receives the status report from user
equipment 10, it can also choose not to perform data retransmission.
[0041] In another embodiment, when the downlink carrier component
removal signaling is a RRC signaling and the de-configured downlink
carrier component is further used to send user equipment 10 downlink
assignment information related to at least one associated downlink carrier
component associated with the de-configured downlink carrier component
and uplink grant information related to at least one associated uplink
carrier component associated with the de-configured downlink carrier
component, then, after user equipment 10 receives the RRC signaling
from base station 20 in layer 3, it determines whether information about a
replaced downlink carrier component is included in the RRC signaling.
[0042] User equipment 10 indicates layer 1, for example, physical layer, to
stop relevant measurements, for example, channel quality indicator (CQI)
measurement and/or mobility measurement, performed on the at least one
associated downlink carrier component and indicates layer 1 for example,
physical layer, to stop transmitting a sounding reference signal (SRS) on
the at least one associated uplink carrier component, if the information
about the replaced downlink carrier components is not included in the
RRC signaling; additionally, user equipment 10 also indicates layer 1, for
example, physical layer, to stop the pending HARQ procedures of the at
least one associated downlink carrier component and indicates layer 2, for
example, MAC layer, to flush the HARQ receiving buffer related to the at
least one associated downlink carrier component and/or indicates layer 2,
for example, RLC layer, to stop a re-ordering procedure and/or indicates
layer 2, for example, RLC layer, to generate a status report and send the
status report to base station 20, wherein the status report is used to
indicate base station 20 to perform retransmission on layer 2, for example,
RLC layer, and inform the base station of the data needed to be
retransmitted; and user equipment 10 also indicates layer 1 , for example,
physical layer, to stop the pending HARQ procedures of the at least one
associated uplink carrier component and indicates layer 2, for example
MAC layer, to flush the HARQ receiving buffer related to the at least one
associated uplink carrier component, and/or indicates layer 2, for example,
RLC layer, to perform retransmission.
[0043] Optionally, when at least one target downlink carrier component in the
at least one associated downlink carrier component is further used to
provide reference path loss estimation for other uplink carrier components,
user equipment 10 indicates layer 1, for example, physical layer, to
perform the reference path loss estimation on the at least one target
downlink carrier component.
[0044] It should be noted, that the situation in which the information about
the replaced downlink carrier components is not included in the RRC
signaling mentioned above can include two events, one event, a
information field for accommodating the information of a replaced
downlink carrier component is configured in the RRC signaling, but base
station 20 has not re-configured a downlink carrier component as a
replaced downlink carrier component, thus, the information field is, for
example, 0; another event, a information field for accommodating the
information of the replaced downlink carrier components is not
configured in the RRC signaling.
[0045] User equipment 10 receives the downlink assignment information
related to at least one associated downlink carrier component associated
with the de-configured downlink carrier component and the uplink grant
information related to at least one associated uplink carrier component
associated with the de-configured downlink carrier component on the
replaced downlink carrier component, if the information about the
replaced downlink carrier component is included in the RRC signaling.
[0046] It should be noted, that for the situation, in which, the information
about the replaced downlink carrier component is included in the RRC
signaling received by user equipment 10, correspondingly, at base station
20 side, base station 20 executes the step of re-configuring a replaced
downlink carrier component.
[0047] More specifically, as shown in FIG.2, firstly, in step S21, base station
20 re-configures an activated downlink carrier component as a replaced
downlink carrier component. For example, base station 20 can select a
downlink carrier component with the best channel condition or select a
downlink carrier component with the lightest channel capacity as a
replaced downlink carrier component.
[0048] Then, in step S22, base station 22 inserts information of the replaced
downlink carrier component to a RRC signaling. The RRC signaling is
used to indicate a de-configured downlink carrier component and a
replaced downlink carrier component, and the replaced downlink carrier
component is used to replace the de-configured downlink carrier
component and send downlink assignment of at least one associated
downlink carrier component associated with the de-configured downlink
carrier component and uplink grant of at least one associated uplink
carrier component associated with the de-configured carrier to user
equipment 10.
[0049] Finally, in step S23, base station 20 sends the RCC signaling with the
inserted information of the replaced downlink carrier component to user
equipment 10.
[0050] Certainly, in the above embodiments, base station 20 and user
equipment 10 can make an appointment in advance that a de-configured
carrier component is replaced by a downlink primary carrier component
(DL PCC) and downlink assignment information related to at least one
associated downlink carrier component associated with the de-configured
downlink carrier component and uplink grant information related to at
least one associated uplink carrier component associated with the
de-configured downlink carrier component is sent to user equipment 10.
Based on that, after user equipment 10 receives the RRC signaling from
base station 20, user equipment 10 will receive downlink assignment
information related to at least one associated downlink carrier component
associated with the de-configured downlink carrier component and uplink
grant information related to at least one associated uplink carrier
component associated with the de-configured downlink carrier component
on the downlink primary carrier component according to the appointment
in advance.
[0051] In another embodiment, when the downlink carrier component
removal signaling is a MAC CE signaling and the de-activated downlink
carrier component is further used to send user equipment 10 downlink
assignment information related to at least one associated downlink carrier
component associated with the de-activated downlink carrier component
and uplink grant information related to at least one associated uplink
carrier component associated with the de-activated downlink carrier
component, user equipment 10 extracts status information from the MAC
CE signaling after it receives the MAC signaling from base station 20 in
layer 2.
[0052] It should be noted, that the status information includes the status
information of all configured downlink carrier components, certainly also
includes the status information of at least one associated downlink carrier
component associated with the de-activated downlink carrier component.
[0053] The status of at least one associated downlink carrier component is set
by base station 20. More specifically, base station 20 can set the at least
one associated downlink carrier component all in the de-activated status,
or partially in the de-activated status, or all in the activated status.
[0054] If the at least one hit downlink carrier component of the at least one
associated downlink carrier component is in the de-activated status, user
equipment 10 indicates layer 1, for example, physical layer, to stop
relevant measurements, for example, channel quality indicator
measurement and/or mobility measurement, performed on at least one hit
downlink carrier component, and indicates layer 1, for example, physical
layer, to stop the pending HARQ procedures of the at least one hit
downlink carrier component, and indicates layer 2, for example, MAC
layer, to flush the HARQ receiving buffer related to the at least one hit
downlink carrier component and/or indicates layer 2, for example, RLC
layer, to stop a re-ordering procedure and/or indicates layer 2, for example,
RLC layer to generate a status report and send the status report to base
station 20, wherein the status report is used to indicate base station 20 to
perform retransmission in layer 2, for example, RLC layer and inform
base station 20 of the data needed to be retransmitted.
[0055] Optionally, when at least one target downlink carrier component in the
at least one hit downlink carrier component is further used to provide
reference path loss estimation for other uplink carrier components, user
equipment 10 further indicates layer 1, for example, physical layer, to
perform the reference path loss estimation on the at least one target
downlink carrier component.
[0056] In the above embodiments, optionally, user equipment 10 continues to
determine whether the status information included in the MAC CE
signaling further includes status of at least one associated uplink carrier
component associated with the de-activated downlink carrier component,
or user equipment 10 determines whether status information of the uplink
carrier component is received from base station 20 in the same TTI, the
status information of the uplink carrier component includes status of at
least one associated uplink component carrier associated with the
de-activated downlink carrier component.
[0057] If the status information included in the MAC CE signaling further
includes the status of at least one associated uplink carrier component
associated with the de-activated downlink carrier component, or the status
information of the uplink carrier component is received from base station
20 in the same TTI and at least one hit downlink carrier component of the
at least one associated downlink carrier component is in the de-activated
status, user equipment 10 indicates layer 1, for example physical layer, to
stop transmitting a sounding reference signal on the at least one hit uplink
carrier component, and indicates layer 1, for example, physical layer, to
stop the pending HARQ procedures of the at least one hit uplink carrier
component and indicates layer 2, for example, MAC layer, to flush the
HARQ receiving buffer related to the at least one hit uplink carrier
component, and/or indicates layer 2, for example, RLC layer to perform
retransmission.
[0058] If the status information included in the MAC CE signaling does not
include the status of at least one associated uplink carrier component
associated with the de-activated downlink carrier component, or the status
information of the uplink carrier component is not received from base
station 20 in the same TTI, user equipment 10 indicates layer 1, for
example, physical layer, to stop transmitting a sounding reference signal
on the at least one associated uplink carrier component, and indicates
layer 1, for example physical layer, to stop the pending HARQ procedures
of the at least one associated uplink carrier component and indicates layer
2, for example, MAC layer to flush the HARQ receiving buffer related to
the at least one associated uplink carrier component, and/or indicates
layer 2, for example RLC layer to perform retransmission.
[0059] The technology scheme of the present invention is described above
from the perspective of the method. In the following, the technology
scheme of the present invention will be further described from the
perspective of the apparatus.
[0060] FIG.3 shows a block diagram of an optimizing apparatus 101 for
optimizing a user plan operation in user equipment 10 of a wireless
communication system based on carrier aggregation according to an
embodiment of the present invention.
[0061] Firstly, a first receiving means 101 1 in the optimizing apparatus 101 in
user equipment 10 receives a downlink carrier component removal
signaling from base station 20.
[0062] The downlink carrier component removal signaling is used to indicate
a removed downlink carrier component. Optionally, the downlink carrier
component removal signaling is a MAC CE (MAC control element)
signaling, being used to indicate a de-activated downlink carrier
component; or the downlink carrier component removal signaling is a
RRC signaling, being used to indicate a de-configured downlink carrier
component.
[0063] Generally, when the downlink data queue at base station 20 side runs
empty, base station 20 will de-activate a downlink carrier component.
After base station 20 determines to de-activate a downlink carrier
component, base station 20 will put the information of the de-activated
downlink carrier component into a MAC CE signaling, and send the MAC
CE signaling to user equipment 10 through any of the other downlink
carrier components in the activated status. After the first receiving means
101 1 receives the MAC CE signaling from base station 20, it can know
which downlink carrier component is de-activated according to the
information of the de-activated downlink carrier component included in
the MAC CE signaling.
[0064] Then, a first indicating means 1012 in the optimizing apparatus 101 in
user equipment 10, according to the received downlink carrier component
removal signaling, stops the pending HARQ procedures of the removed
downlink carrier component and flushes the HARQ receiving buffer
related to the removed downlink carrier component and/or stops a
re-ordering procedure and/or generates a status report and sends the status
report to base station 20. The status report is used to indicate base station
20 to perform retransmission and inform base station 20 of the data
needed to be retransmitted.
[0065] Optionally, when the downlink carrier component removal signaling is
a MAC CE signaling, after the first receiving means 101 1 receives the
MAC CE signaling from base station 20 in layer 2, for example, MAC
layer, the first indicating means 1012 indicates layer 1, for example,
physical layer, to stop the pending HARQ procedures of the de-activated
downlink carrier component and indicates layer 2, for example, MAC
layer, to flush the HARQ receiving buffer related to the de-activated
downlink carrier component and/or indicates layer 2, for example, RLC
layer, to stop a re-ordering procedure and/or indicates layer 2 , for
example, RLC layer, to generate a status report. The status report is used
to indicate base station 20 to perform retransmission in layer 2, for
example, RLC layer, and inform base station 20 of the data needed to be
retransmitted.
[0066] It should be noted, that in the different systems, the HARQ receiving
buffer can be located in layer 1, for example, physical layer, or in layer 2,
for example, MAC layer. It is understandable for those skilled in the art,
that when the HARQ receiving buffer is located in layer 1, for example,
physical layer, the first indicating means 1012 indicates the physical layer
to flush the HARQ receiving buffer related to the de-activated downlink
carrier component; and when the HARQ receiving buffer is located in
layer 2, for example, MAC layer, the first indicating means 1012 indicates
the MAC layer to flush the HARQ receiving buffer related to the
de-activated downlink carrier component.
[0067] Optionally, when the downlink carrier component removal signaling is
a RRC signaling, after the first receiving means 1011 receives the RCC
signaling from base station 20 in layer 3, for example, RCC layer, the first
indicating means 1012 indicates layer 1, for example, physical layer, to
stop the pending HARQ procedures of the de-configured downlink carrier
component and indicates layer 2, for example, MAC layer, to flush the
HARQ receiving buffer related to the de-configured downlink carrier
component and/or indicates layer 2, for example, RLC layer, to stop a
re-ordering procedure and/or indicates layer 2, for example, RLC layer, to
generate a status report. The status report is used to indicate base station
20 to perform retransmission in layer 2, for example, RLC layer, and
inform base station 20 of the data needed to be retransmitted.
[0068] After base station 20 receives the status report from user equipment 10,
it performs data retransmission in layer 2, for example, RLC layer,
according to the data needed to be retransmitted indicated in the status
report.
[0069] Certainly, after base station 20 receives the status report from user
equipment 10, it can also choose not to perform data retransmission.
[0070] In another embodiment, when the downlink carrier component
removal signaling is a RRC signaling and the de-configured downlink
carrier component is further used to send user equipment 10 downlink
assignment information related to at least one associated downlink carrier
component associated with the de-configured downlink carrier component
and uplink grant information related to at least one associated uplink
carrier component associated with the de-configured downlink carrier
component, then, after the first receiving means 101 1 receives the RRC
signaling from base station 20 in layer 3, a first determining means (not
shown in FIG.3 for the purpose of simplicity) determines whether
information about a replaced downlink carrier component is included in
the RRC signaling.
[0071] A second indicating means (not shown in FIG.3 for the purpose of
simplicity) in the optimizing apparatus 101 in user equipment 10 indicates
layer 1, for example, physical layer, to stop relevant measurements, for
example, channel quality indicator (CQI) measurement and/or mobility
measurement, performed on the at least one associated downlink carrier
component and indicates layer 1 for example, physical layer, to stop
transmitting a sounding reference signal (SRS) on the at least one
associated uplink carrier component, if the information about the replaced
downlink carrier components is not included in the RRC signaling;
additionally, the second indicating means also indicates layer 1, for
example, physical layer, to stop the pending HARQ procedures of the at
least one associated downlink carrier component and indicates layer 2, for
example, MAC layer, to flush the HARQ receiving buffer related to the at
least one associated downlink carrier component and/or indicates layer 2,
for example, RLC layer, to stop a re-ordering procedure and/or indicates
layer 2, for example, RLC layer, to generate a status report and send the
status report to base station 20, wherein the status report is used to
indicate base station 20 to perform retransmission on layer 2, for example,
RLC layer, and inform the base station of the data needed to be
retransmitted; and the second indicating means also indicates layer 1 , for
example, physical layer, to stop the pending HARQ procedures of the at
least one associated uplink carrier component and indicates layer 2, for
example MAC layer, to flush the HARQ receiving buffer related to the at
least one associated uplink carrier component, and/or indicates layer 2, for
example, RLC layer, to perform retransmission.
[0072] Optionally, when at least one target downlink carrier component in the
at least one associated downlink carrier component is further used to
provide reference path loss estimation for other uplink carrier components,
the second indicating means indicates layer 1, for example, physical layer,
to perform the reference path loss estimation on the at least one target
downlink carrier component.
[0073] It should be noted, that the situation in which the information about
the replaced downlink carrier components is not included in the RRC
signaling mentioned above can include two events, one event, a
information field for accommodating the information of a replaced
downlink carrier component is configured in the RRC signaling, but base
station 20 has not re-configured a downlink carrier component as a
replaced downlink carrier component, thus, the information field is, for
example, 0; another event, a information field for accommodating the
information of the replaced downlink carrier components is not
configured in the RRC signaling.
[0074] A second receiving means (not shown in FIG.3 for the purpose of
simplicity) in the optimizing apparatus 101 in user equipment 10 receives
the downlink assignment information related to at least one associated
downlink carrier component associated with the de-configured downlink
carrier component and the uplink grant information related to at least one
associated uplink carrier component associated with the de-configured
downlink carrier component on the replaced downlink carrier component,
if the information about the replaced downlink carrier component is
included in the RRC signaling.
[0075] It should be noted, that for the situation, in which, the information
about the replaced downlink carrier component is included in the RRC
signaling received by the first receiving means 101 1, correspondingly, at
base station 20 side, base station 20 executes the step of re-configuring a
replaced downlink carrier component.
[0076] More specifically, as shown in FIG.4, firstly, a re-configuring means
201 1 in an assisting optimizing apparatus 201 in base station 20
re-configures an activated downlink carrier component as a replaced
downlink carrier component. For example, the re-configuring means 201 1
can select a downlink carrier component with the best channel condition
or select a downlink carrier component with the lightest channel capacity
as a replaced downlink carrier component.
[0077] Then, an inserting means 2012 in the assisting optimizing apparatus
201 in base station 22 inserts information of the replaced downlink carrier
component to a RRC signaling. The RRC signaling is used to indicate a
de-configured downlink carrier component and a replaced downlink
carrier component, and the replaced downlink carrier component is used
to replace the de-configured downlink carrier component and send
downlink assignment of at least one associated downlink carrier
component associated with the de-configured downlink carrier component
and uplink grant of at least one associated uplink carrier component
associated with the de-configured carrier to user equipment 10.
[0078] Finally, a sending means 2012 in the assisting optimizing apparatus
201 in base station 20 sends the RCC signaling with the inserted
information of the replaced downlink carrier component to user
equipment 10.
[0079] Certainly, in the above embodiments, base station 20 and user
equipment 10 can make an appointment in advance that a de-configured
carrier component is replaced by a downlink primary carrier component
(DL PCC) and downlink assignment information related to at least one
associated downlink carrier component associated with the de-configured
downlink carrier component and uplink grant information related to at
least one associated uplink carrier component associated with the
de-configured downlink carrier component is sent to user equipment 10.
Based on that, after the first receiving means 1011 receives the RRC
signaling from base station 20, the second receiving means will receive
downlink assignment information related to at least one associated
downlink carrier component associated with the de-configured downlink
carrier component and uplink grant information related to at least one
associated uplink carrier component associated with the de-configured
downlink carrier component on the downlink primary carrier component
according to the appointment in advance.
[0080] In another embodiment, when the downlink carrier component
removal signaling is a MAC CE signaling and the de-activated downlink
carrier component is further used to send user equipment 10 downlink
assignment information related to at least one associated downlink carrier
component associated with the de-activated downlink carrier component
and uplink grant information related to at least one associated uplink
carrier component associated with the de-activated downlink carrier
component, an extracting means (not shown in FIG.3 for the purpose of
simplicity) in the optimizing apparatus 101 in user equipment 10 extracts
status information from the MAC CE signaling after the first receiving
means 101 1 receives the MAC signaling from base station 20 in layer 2.
[0081] It should be noted, that the status information includes the status
information of all configured downlink carrier components, certainly also
includes the status information of at least one associated downlink carrier
component associated with the de-activated downlink carrier component.
[0082] The status of at least one associated downlink carrier component is set
by base station 20. More specifically, base station 20 can set the at least
one associated downlink carrier component all in the de-activated status,
or partially in the de-activated status, or all in the activated status.
[0083] If the at least one hit downlink carrier component of the at least one
associated downlink carrier component is in the de-activated status, a
third indicating means (not shown in FIG.3 for the purpose of simplicity)
in the optimizing apparatus 101 in user equipment 10 indicates layer 1, for
example, physical layer, to stop relevant measurements, for example,
channel quality indicator measurement and/or mobility measurement,
performed on at least one hit downlink carrier component, and indicates
layer 1, for example, physical layer, to stop the pending HARQ
procedures of the at least one hit downlink carrier component, and
indicates layer 2, for example, MAC layer, to flush the HARQ receiving
buffer related to the at least one hit downlink carrier component and/or
indicates layer 2, for example, RLC layer, to stop a re-ordering procedure
and/or indicates layer 2, for example, RLC layer to generate a status
report and send the status report to base station 20, wherein the status
report is used to indicate base station 20 to perform retransmission in
layer 2, for example, RLC layer and inform base station 20 of the data
needed to be retransmitted.
[0084] Optionally, when at least one target downlink carrier component in the
at least one hit downlink carrier component is further used to provide
reference path loss estimation for other uplink carrier components, user
equipment 10 further indicates layer 1, for example, physical layer, to
perform the reference path loss estimation on the at least one target
downlink carrier component.
[0085] In the above embodiments, optionally, the determining means (not
shown in FIG.3 for the purpose of simplicity) in the optimizing apparatus
101 in user equipment 10 continues to determine whether the status
information included in the MAC CE signaling further includes status of
at least one associated uplink carrier component associated with the
de-activated downlink carrier component, or user equipment 10
determines whether status information of the uplink carrier component is
received from base station 20 in the same TTI, the status information of
the uplink carrier component includes status of at least one associated
uplink component carrier associated with the de-activated downlink
carrier component.
[0086] If the status information included in the MAC CE signaling further
includes the status of at least one associated uplink carrier component
associated with the de-activated downlink carrier component, or the status
information of the uplink carrier component is received from base station
20 in the same TTI and at least one hit downlink carrier component of the
at least one associated downlink carrier component is in the de-activated
status, a fourth indicating means (not shown in FIG.3 for the purpose of
simplicity) in the optimizing apparatus 101 in user equipment 10 indicates
layer 1, for example physical layer, to stop transmitting a sounding
reference signal on the at least one hit uplink carrier component, and
indicates layer 1, for example, physical layer, to stop the pending HARQ
procedures of the at least one hit uplink carrier component and indicates
layer 2, for example, MAC layer, to flush the HARQ receiving buffer
related to the at least one hit uplink carrier component, and/or indicates
layer 2, for example, RLC layer to perform retransmission.
[0087] If the status information included in the MAC CE signaling does not
include the status of at least one associated uplink carrier component
associated with the de-activated downlink carrier component, or the status
information of the uplink carrier component is not received from base
station 20 in the same TTI, the fourth indicating means indicates layer 1,
for example, physical layer, to stop transmitting a sounding reference
signal on the at least one associated uplink carrier component, and
indicates layer 1, for example physical layer, to stop the pending HARQ
procedures of the at least one associated uplink carrier component and
indicates layer 2, for example, MAC layer to flush the HARQ receiving
buffer related to the at least one associated uplink carrier component,
and/or indicates layer 2, for example RLC layer to perform
retransmission.
[0088] It is intelligible to those skilled in the art that, the present
invention is not limited to the details of the embodiments described above.
And the present invention can be implemented in other concrete forms
without deviating the spirit or basic features of the present invention.
Therefore, from any perspective, the embodiments should be considered
as exemplary but not limited. The scope of the present invention is
defined by the claims but not the specification above, so as to let the
present invention include all the variation which falls in to the definition
and the scope of the equivalent condition of the claims. Any drawings
indicator in the claims should not be understood as the limitation to the
protection scope. Further, term "include" does not exclude other units or
steps, singular does not exclude plural. A plurality of units or apparatuses
described in the system claims can also be implemented by one unit or
apparatus via software of hardware. Terms "first" and "second" are used
to indicate name other than any specific order.
CLAIMS
1. A method for optimizing a user plan operation in a user equipment of
a wireless communication system based on carrier aggregation, wherein the
method comprises the following steps:
a. receiving a downlink carrier component removal signaling from a
base station, wherein the downlink carrier component removal signaling is
used to indicate a removed downlink carrier component;
b. according to the downlink carrier component removal signaling,
stopping the pending HARQ procedures of the removed downlink carrier
component and flushing the HARQ receiving buffer related to the removed
downlink carrier component and/or stopping a re-ordering procedure and/or
generating a status report and sending the status report to the base station,
wherein the status report is used to indicate the base station to perform
retransmission and inform the base station of the data needed to be
retransmitted.
2. A method according to claim 1, wherein the downlink carrier
component removal signaling is a MAC CE signaling, wherein,
the step a comprises: receiving the MAC CE signaling from the base
station in layer 2, the MAC CE signaling being used to indicate a de-activated
downlink carrier component;
the step b comprises: according to the MAC CE signaling, indicating
layer 1 to stop the pending HARQ procedures of the de-activated downlink
carrier component and indicating layer 1 or layer 2 to flush the HARQ
receiving buffer related to the de-activated downlink carrier component
and/or indicating layer 2 to stop a re-ordering procedure and/or indicating
layer 2 to generate a status report and send the status report to the base station,
wherein the status report is used to indicate the base station to perform
retransmission in layer 2 and inform the base station of the data needed to be
retransmitted.
3. A method according to claim 1, wherein the downlink carrier
component removal signaling is a RRC signaling, wherein,
the step a comprises: receiving the RRC signaling from the base station
in layer 3, the RRC signaling being used to indicate a de-configured downlink
carrier component;
the step b comprises: according to the RRC signaling, indicating layer
1 to stop the pending HARQ procedures of the de-configured downlink
carrier component and indicating layer 1 or layer 2 to flush the HARQ
receiving buffer related to the de-configured downlink carrier component
and/or indicating layer 2 to stop a re-ordering procedure and/or indicating
layer 2 to generate a status report and send the status report to the base station,
wherein the status report is used to indicate the base station to perform
retransmission in layer 2 and inform the base station of the data needed to be
retransmitted.
4. A method according to claim 3, wherein when the de-configured
downlink carrier component is further used to send the user equipment
downlink assignment information related to at least one associated downlink
carrier component associated with the de-configured downlink carrier
component and uplink grant information related to at least one associated
uplink carrier component associated with the de-configured downlink carrier
component, the method further comprising:
i . determining whether information about a replaced downlink carrier
component is included in the RRC signaling;
ii. receiving the downlink assignment information related to at least
one associated downlink carrier component associated with the de-configured
downlink carrier component and the uplink grant information related to at
least one associated uplink carrier component associated with the
de-configured downlink carrier component on the replaced downlink carrier
component, if the information about the replaced downlink carrier component
is included in the RRC signaling;
ii' . indicating layer 1 to stop relevant measurements performed on the
at least one associated downlink carrier component and indicating layer 1 to
stop transmitting a sounding reference signal on the at least one associated
uplink carrier component, if the information about the replaced downlink
carrier components is not included in the RRC signaling; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one associated downlink carrier component and indicating layer 1 or layer 2
to flush the HARQ receiving buffer related to the at least one associated
downlink carrier component and/or indicating layer 2 to stop a re-ordering
procedure and/or indicating layer 2 to generate a status report and send the
status report to the base station, wherein the status report is used to indicate
the base station to perform retransmission and inform the base station of the
data needed to be retransmitted; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one associated uplink carrier component and indicating layer 2 to flush the
HARQ receiving buffer related to the at least one associated uplink carrier
component, and/or indicating layer 2 to perform retransmission.
5. A method according to claim 4, wherein when at least one target
downlink carrier component in the at least one associated downlink carrier
component is further used to provide reference path loss estimation for other
uplink carrier components, the step ii' further comprises: indicating layer 1 to
perform the reference path loss estimation on the at least one target downlink
carrier component.
6. A method according to claim 2, wherein when the de-activated
downlink carrier component is further used to send the user equipment
downlink assignment information related to at least one associated downlink
carrier component associated with the de-activated downlink carrier
component and uplink grant information related to at least one associated
uplink carrier component associated with the de-activated downlink carrier
component, the method further comprising:
O. extracting status information from the received MAC CE signaling,
wherein the status information includes the status of at least one associated
downlink carrier component associated with the de-activated downlink carrier
component;
P. if the at least one hit downlink carrier component of the at least one
associated downlink carrier component is in the de-activated status,
indicating layer 1 to stop relevant measurements performed on at least one hit
downlink carrier component,; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one hit downlink carrier component and indicating layer 1 or layer 2 to flush
the HARQ receiving buffer related to the at least one hit downlink carrier
component and/or indicating layer 2 to stop a re-ordering procedure and/or
indicating layer 2 to generate a status report and send the status report to the
base station, wherein the status report is used to indicate the base station to
perform retransmission and inform the base station of the data needed to be
retransmitted.
7. A method according to claim 6, wherein the method further
comprises:
Q. determining whether the status information included in the MAC
CE signaling further includes status of at least one associated uplink carrier
component associated with the de-activated downlink carrier component, or
determining whether status information of the uplink carrier component is
received from the base station in the same TTI, the status information of the
uplink carrier component includes status of at least one associated uplink
component carrier associated with the de-activated downlink carrier
component;
R. if the status information included in the MAC CE signaling further
includes the status of at least one associated uplink carrier component
associated with the de-activated downlink carrier component, or the status
information of the uplink carrier component is received from the base station
in the same TTI and at least one hit downlink carrier component of the at
least one associated downlink carrier component is in the de-activated status,
indicating layer 1 to stop transmitting a sounding reference signal on at least
one hit uplink carrier component,; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one hit uplink carrier component and indicating layer 2 to flush the HARQ
receiving buffer related to the at least one hit uplink carrier component,
and/or indicating layer 2 to perform retransmission.
R'. if the status information included in the MAC CE signaling does
not include the status of at least one associated uplink carrier component
associated with the de-activated downlink carrier component, or the status
information of the uplink carrier component is not received from the base
station in the same TTI, indicating layer 1 to stop transmitting a sounding
reference signal on the at least one associated uplink carrier component; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one associated uplink carrier component and indicating layer 2 to flush the
HARQ receiving buffer related to the at least one associated uplink carrier
component, and/or indicating layer 2 to perform retransmission.
8. A method according to claim 6, wherein when at least one target
downlink carrier component in the at least one hit downlink carrier
component is further used to provide reference path loss estimation for other
uplink carrier components, the step P further comprising: indicating layer 1 to
perform the reference path loss estimation on the at least one target downlink
carrier component.
9. A method for assisting a user equipment to optimize a user plan
operation in a base station of a wireless communication system based on
carrier aggregation, wherein the method comprises the following steps:
A. re-configuring an activated downlink carrier component as a
replaced downlink carrier component;
B. inserting information of the replaced downlink carrier component to
a RRC signaling, wherein the RRC signaling is used to indicate a
de-configured downlink carrier component and a replaced downlink carrier
component, the replaced downlink carrier component is used to replace the
de-configured downlink carrier component and send downlink assignment of
at least one associated downlink carrier component associated with the
de-configured downlink carrier component and uplink grant of at least one
associated uplink carrier component associated with the de-configured carrier
to the user equipment;
C. sending the RRC signaling to the user equipment.
10. An optimizing apparatus for optimizing a user plan operation in a
user equipment of a wireless communication system based on carrier
aggregation, wherein the optimizing apparatus comprises:
a first receiving means, for receiving a downlink carrier component
removal signaling from a base station, wherein the downlink carrier
component removal signaling is used to indicate a removed downlink carrier
component;
a first indicating means, for according to the downlink carrier
component removal signaling, stopping the pending HARQ procedures of the
removed downlink carrier component and flushing the HARQ receiving
buffer related to the removed downlink carrier component and/or stopping a
re-ordering procedure and/or generating a status report and sending the status
report to the base station, wherein the status report is used to indicate the base
station to perform retransmission and inform the base station of the data
needed to be retransmitted.
11 . An optimizing apparatus according to claim 10, wherein the
downlink carrier component removal signaling is a MAC CE signaling,
wherein,
the first receiving means is used for receiving the MAC CE signaling
from the base station in layer 2, the MAC CE signaling being used to indicate
a de-activated downlink carrier component;
the first indicating means is used for according to the MAC CE
signaling, indicating layer 1 to stop the pending HARQ procedures of the
de-activated downlink carrier component and indicating layer 1 or layer 2 to
flush the HARQ receiving buffer related to the de-activated downlink carrier
component and/or indicating layer 2 to stop a re-ordering procedure and/or
indicating layer 2 to generate a status report and send the status report to the
base station, wherein the status report is used to indicate the base station to
perform retransmission in layer 2 and inform the base station of the data
needed to be retransmitted.
12. An optimizing apparatus according to claim 10, wherein the
downlink carrier component removal signaling is a RRC signaling, wherein,
the first receiving means is used for receiving the RRC signaling from
the base station in layer 3, the RRC signaling being used to indicate a
de-configured downlink carrier component;
the first indicating means is used for according to the RRC signaling,
indicating layer 1 to stop the pending HARQ procedures of the de-configured
downlink carrier component and indicating layer 1 or layer 2 to flush the
HARQ receiving buffer related to the de-configured downlink carrier
component and/or indicating layer 2 to stop a re-ordering procedure and/or
indicating layer 2 to generate a status report and send the status report to the
base station, wherein the status report is used to indicate the base station to
perform retransmission in layer 2 and inform the base station of the data
needed to be retransmitted.
13. An optimizing apparatus according to claim 12, wherein when the
de-configured downlink carrier component is further used to send the user
equipment downlink assignment information related to at least one associated
downlink carrier component associated with the de-configured downlink
carrier component and uplink grant information related to at least one
associated uplink carrier component associated with the de-configured
downlink carrier component, the optimizing apparatus further comprising:
a first determining means, for determining whether information about a
replaced downlink carrier component is included in the RRC signaling;
a second receiving means, for receiving the downlink assignment
information related to at least one associated downlink carrier component
associated with the de-configured downlink carrier component and the uplink
grant information related to at least one associated uplink carrier component
associated with the de-configured downlink carrier component on the
replaced downlink carrier component, if the information about the replaced
downlink carrier component is included in the RRC signaling;
a second indicating means, for indicating layer 1 to stop relevant
measurements performed on the at least one associated downlink carrier
component and indicating layer 1 to stop transmitting a sounding reference
signal on the at least one associated uplink carrier component, if the
information about the replaced downlink carrier components is not included
in the RRC signaling; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one associated downlink carrier component and indicating layer 1 or layer 2
to flush the HARQ receiving buffer related to the at least one associated
downlink carrier component and/or indicating layer 2 to stop a re-ordering
procedure and/or indicating layer 2 to generate a status report and send the
status report to the base station, wherein the status report is used to indicate
the base station to perform retransmission and inform the base station of the
data needed to be retransmitted; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one associated uplink carrier component and indicating layer 2 to flush the
HARQ receiving buffer related to the at least one associated uplink carrier
component, and/or indicating layer 2 to perform retransmission.
14. An optimizing apparatus according to claim 11, wherein when the
de-activated downlink carrier component is further used to send the user
equipment downlink assignment information related to at least one associated
downlink carrier component associated with the de-activated downlink carrier
component and uplink grant information related to at least one associated
uplink carrier component associated with the de-activated downlink carrier
component, the optimizing apparatus further comprising:
an extracting means, for extracting status information from the received
MAC CE signaling, wherein the status information includes the status of at
least one associated downlink carrier component associated with the
de-activated downlink carrier component;
a third indicating means, for if the at least one hit downlink carrier
component of the at least one associated downlink carrier component is in the
de-activated status, indicating layer 1 to stop relevant measurements
performed on at least one hit downlink carrier component,; and
indicating layer 1 to stop the pending HARQ procedures of the at least
one hit downlink carrier component and indicating layer 1 or layer 2 to flush
the HARQ receiving buffer related to the at least one hit downlink carrier
component and/or indicating layer 2 to stop a re-ordering procedure and/or
indicating layer 2 to generate a status report and send the status report to the
base station, wherein the status report is used to indicate the base station to
perform retransmission and inform the base station of the data needed to be
retransmitted.
15. An assisting optimizing apparatus for assisting a user equipment to
optimize a user plan operation in a base station of a wireless communication
system based on carrier aggregation, wherein the assisting optimizing
apparatus comprises:
a configuring means, for re-configuring an activated downlink carrier
component as a replaced downlink carrier component;
an inserting means, for inserting information of the replaced downlink
carrier component to a RRC signaling, wherein the RRC signaling is used to
indicate a de-configured downlink carrier component and a replaced
downlink carrier component, the replaced downlink carrier component is used
to replace the de-configured downlink carrier component and send downlink
assignment of at least one associated downlink carrier component associated
with the de-configured downlink carrier component and uplink grant of at
least one associated uplink carrier component associated with the
de-configured carrier to the user equipment;
a sending means, for sending the RRC signaling to the user equipment.