Method, system and apparatus for sending and receiving feedback information
The present invention relates to the technical field of wireless communication, particularly relates to a method, system and apparatus for sending and receiving feedback information, to be used for transmitting the feedback information after the aggregation of carriers with different time division duplex (TDD) uplink and downlink configurations. The method of an embodiment of the present invention comprises: determining a dedicated feedback timing relationship by using a user equipment (UE) aggregating carriers with different TDD uplink/downlink configurations; the UE transmitting the feedback information corresponding to the downlink data on the primary carrier according to the determined dedicated feedback timing relationship. Because the feedback information can be transmitted after the aggregation of carriers with different TDD uplink and downlink configurations, thus the transmission efficiency and system performance after the aggregation of carriers with different TDD uplink and downlink configurations are improved.
1. A method of sending feedback information, comprising:
determining, by a user equipment, a dedicated feedback timing; and
sending, by the user equipment, feedback information, corresponding to downlink data, on a primary carrier according to the determined dedicated feedback timing,
wherein the user equipment is a user equipment which is configured with carrier aggregation with different Time Division Duplex (TDD) uplink-downlink configurations, and wherein the dedicated feedback timing is one of feedback timings supported by a Release 8 Long Term Evolution (Rel-8 LTE) TDD system;
wherein before the user equipment sends the feedback information, the method further comprises a step of:
determining the number of bits of the feedback information by means of Formula 2 of:
N
=
∑
X
=
0
C
-
1
M
X
DL
×
TB
X
,
Formula
2
wherein N is the number of bits of the feedback information, M X DL is the number of downlink subframes among M subframes on a carrier X, determined according to the dedicated feedback timing, for which the feedback information needs to be transmitted in a same uplink subframe, C is the number of aggregated carriers, and if a single-codeword transmission mode is configured for downlink or spatial bundling of the feedback information is configured on the carrier X, then TB X =1, otherwise TB X =2.
2. The method according to claim 1 , wherein uplink subframes, in which the feedback information corresponding to the downlink data is transmitted, determined according to the dedicated feedback timing are a subset or all of uplink subframes on the primary carrier.
3. The method according to claim 1 , wherein the determining, by the user equipment, a dedicated feedback timing comprises:
determining, by the user equipment, a dedicated feedback timing configured by a network side,
wherein the dedicated feedback timing configured by the network side is the same as a feedback timing corresponding to the primary carrier, or uplink subframes in a TDD uplink-downlink configuration corresponding to the dedicated feedback timing configured by the network side are a subset or all of the uplink subframes on any aggregated carrier of the user equipment.
4. The method according to claim 1 , wherein the determining, by the user equipment, a dedicated feedback timing comprises:
determining, by the user equipment, a prescribed dedicated feedback timing,
wherein a feedback timing corresponding to the primary carrier is prescribed to be used as the dedicated feedback timing, or when the primary carrier is configured with TDD uplink-downlink configuration 0 or 1 or 2 or 6 , a feedback timing corresponding to TDD uplink-downlink configuration 2 is prescribed to be used as the dedicated feedback timing, and when the primary carrier is configured with TDD uplink-downlink configuration 3 or 4 , a feedback timing corresponding to TDD uplink-downlink configuration 4 is prescribed to be used as the dedicated feedback timing,
wherein TDD uplink-downlink configurations 0 , 1 , 2 , 3 , 4 and 6 are defined by LTE TDD.
5. A method of receiving feedback information, comprising:
determining, by a network-side apparatus, a dedicated feedback timing; and
receiving, by the network-side apparatus, feedback information from a user equipment on a primary carrier of the user equipment according to the determined dedicated feedback timing,
wherein the user equipment is a user equipment which is configured with carrier aggregation with different Time Division Duplex (TDD) uplink-downlink configurations, and wherein the dedicated feedback timing is one of feedback timings supported by a Release 8 Long Term Evolution (Rel-8 LTE) TDD system;
wherein before the network-side apparatus receives the feedback information, the method further comprises a step of:
determining the number of bits of the feedback information by means of Formula 2 of:
N
=
∑
X
=
0
C
-
1
M
X
DL
×
TB
X
,
Formula
2
wherein N is the number of bits of the feedback information, M X DL is the number of downlink subframes among M subframes on a carrier X, determined according to the dedicated feedback timing, for which the feedback information needs to be transmitted in a same uplink subframe, C is the number of aggregated carriers, and if a single-codeword transmission mode is configured for downlink or spatial bundling of the feedback information is configured on the carrier X, then TB X =1, otherwise TB X =2.
6. The method according to claim 5 , wherein uplink subframes, in which the feedback information corresponding to the downlink data is transmitted, determined according to the dedicated feedback timing are a subset or all of uplink subframes on the primary carrier.
7. The method according to claim 5 , wherein before the network-side apparatus receives the feedback information, the method further comprises:
configuring, by the network-side apparatus, a dedicated feedback timing for the user equipment,
wherein the configured dedicated feedback timing is the same as a feedback timing corresponding to the primary carrier, or uplink subframes in a TDD uplink-downlink configuration corresponding to the configured dedicated feedback timing are a subset or all of the uplink subframes on any aggregated carrier of the user equipment.
8. The method according to claim 5 , wherein the determining, by the network-side apparatus, a dedicated feedback timing comprises:
determining, by the network-side apparatus, a prescribed dedicated feedback timing,
wherein a feedback timing corresponding to the primary carrier is prescribed to be used as the dedicated feedback timing, or when the primary carrier is configured with TDD uplink-downlink configuration 0 or 1 or 2 or 6 , a feedback timing corresponding to TDD uplink-downlink configuration 2 is prescribed to be used as the dedicated feedback timing, and when the feedback timing corresponding to the primary carrier corresponds to TDD uplink-downlink configuration 3 or 4 , a feedback timing corresponding to TDD uplink-downlink configuration 4 is prescribed to be used as the dedicated feedback timing,
wherein the TDD uplink-downlink configurations 0 , 1 , 2 , 3 , 4 , and 6 are defined by LTE TDD.
9. An apparatus for sending feedback information, the apparatus, which is configured with carrier aggregation with different Time Division Duplex (TDD) uplink -downlink configurations, comprising at least one processor and at least one storage unit, wherein the at least one storage unit stores program instructions executable by the at least one processor to implement:
a first timing determining module configured to determine a dedicated feedback timing; and
a sending module configured to send feedback information, corresponding to downlink data, on a primary carrier according to the determined dedicated feedback timing, wherein the dedicated feedback timing is one of feedback timings supported by a Release 8 Long Term Evolution (Rel-8 LTE) TDD system;
wherein the first timing determining module is further configured:
to determine the number of bits of the feedback information by means of Formula 2 of:
N
=
∑
X
=
0
C
-
1
M
X
DL
×
TB
X
,
Formula
2
wherein N is the number of bits of the feedback information, M X DL is the number of downlink subframes among M subframes on a carrier X, determined according to the dedicated feedback timing, for which the feedback information needs to be transmitted in a same uplink subframe, C is the number of aggregated carriers, and if a single-codeword transmission mode is configured t for downlink or spatial bundling of the feedback information is configured on the carrier X, then TB X =1, otherwise TB X =2.
10. The apparatus according to claim 9 , wherein the first timing determining module is further configured:
to determine a dedicated feedback timing configured by the network side, wherein the dedicated feedback timing configured by the network side is the same as a feedback timing corresponding to the primary carrier, or uplink subframes in a TDD uplink-downlink configuration corresponding to the dedicated feedback timing configured by the network side are a subset or all of the uplink subframes on any aggregated carrier of the apparatus.
11. The apparatus according to claim 9 , wherein the first timing determining module is further configured:
to determine a prescribed dedicated feedback timing,
wherein a feedback timing corresponding to the primary carrier is prescribed to be used as the dedicated feedback timing, or when the primary carrier is configured with TDD uplink-downlink configuration 0 or 1 or 2 or 6 , a feedback timing corresponding to the TDD uplink-downlink configuration 2 is prescribed to be used as the dedicated feedback timing, and when the primary carrier is configured with TDD uplink-downlink configuration 3 or 4 , a feedback timing corresponding to TDD uplink-downlink configuration 4 is prescribed to be used as the dedicated feedback timing,
wherein TDD uplink-downlink configurations 0 , 1 , 2 , 3 , 4 , and 6 are defined by LTE TDD.