Method and device for sending and receiving downlink control information
Disclosed are a method and a device for sending and receiving downlink control information. The method comprises: discrete user-specific search space is determined, control channel resources corresponding to the discrete user-specific search spaces being distributed discretely; and the downlink control information on the discrete user-specific search space is sent. Through the disclosure, the diversity effect of sending physical downlink control information is improved.
1. A method for sending downlink control information, which is applied to an eNodeB, comprising:
determining discrete user-specific search space, wherein control channel resources corresponding to the discrete user-specific search space are distributed discretely; and
sending the downlink control information on the discrete user-specific search space;
wherein the discrete user-specific search space is contained in one Component Carrier and comprises discrete physical downlink control channel candidates, and the discrete physical downlink control channel candidates is determined by a predefined interval;
wherein the predefined interval is determined by:
an aggregation level, a number of control channel resource units of the user-specific search space and a number of physical downlink control channel candidates.
2. The method according to claim 1 , wherein the control channel resource comprises one of the following: a virtual resource block, a physical resource block and a control channel element.
3. The method according to claim 1 , wherein the method further comprises:
the eNodeB sends to user equipment (UE) a configuration, which is for the UE to detect a downlink control channel, of the control channel resources where the discrete user-specific search space is located, wherein the configuration of the control channel resources comprises that configurations at position of the frequency domain, which are corresponding to position of each time domain unit, of the downlink control channel are the same, or the position of the frequency domain of the downlink control channel changes with the position of the time domain unit.
4. The method according to claim 3 , wherein the time domain unit comprises one of the following: a subframe, a time slot, a plurality of subframes, a plurality of time slots.
5. The method according to claim 3 , wherein the position of the frequency domain is determined by at least one of the following:
downlink bandwidth;
a notification of the high layer signalling;
a high layer signalling and the predefined interval; and
a signalling notification in the downlink control information of the legacy downlink control channel.
6. The method according to claim 5 , wherein determining the position of the frequency domain by the signalling notification in the downlink control information of the legacy downlink control channel comprises:
the position of the frequency domain is determined by taking a resource block group as the unit.
7. A method for receiving downlink control information, which is applied to an user equipment (UE), comprising:
determining discrete user-specific search space, wherein control channel resources corresponding to the discrete user-specific search space are distributed discretely, wherein the discrete user-specific search space is contained in one Component Carrier and comprises discrete physical downlink control channel candidates, and the discrete physical downlink control channel candidates is determined by a predefined interval;
wherein the predefined interval is determined by:
an aggregation level, a number of control channel resource units of the user-specific search space and a number of physical downlink control channel candidates; and
detecting the downlink control information on the discrete user-specific search space.
8. The method according to claim 7 , wherein the method further comprises:
receiving a configuration, which is sent by the eNodeB and is for detecting a downlink control channel, of the control channel resources where the discrete user-specific search space is located, wherein the configuration of the control channel resources comprises that configurations at position of the frequency domain, which are corresponding to position of each time domain unit, of the downlink control channel are the same, or the position of frequency domain of the downlink control channel changes with the position of the time domain unit.
9. A device for sending downlink control information, which is applied to an eNodeB, wherein the device comprises:
a first determination module configured to determine discrete user-specific search space, wherein control channel resources corresponding to the discrete user-specific search space are distributed discretely,
wherein the discrete user-specific search space is contained in one Component Carrier and comprises discrete physical downlink control channel candidates, and the discrete physical downlink control channel candidates is determined by a predefined interval;
wherein the predefined interval is determined by:
an aggregation level, a number of control channel resource units of the user-specific search space and a number of physical downlink control channel candidates; and
a first sending module, which is connected to the first determination module, and configured to send the downlink control information on the discrete user specific search space.
10. The device according to claim 9 , further comprising:
a sending module, which is connected to the first determination module and configured to send to the user equipment (UE) a configuration, which is for the UE to detect a downlink control channel, of the control channel resources where the discrete user-specific search space is located, wherein the configuration of the control channel resources comprises that configurations at position of the frequency domain, which are corresponding to position of each time domain unit, of the downlink control channel are the same, or the position of the frequency domain of the downlink control channel changes with the position of the time domain unit.
11. A device for receiving downlink control information, which is applied to user equipment (UE), comprising:
a third determination module configured to determine discrete user-specific search space, wherein control channel resources corresponding to the discrete user-specific search space are distributed discretely;
wherein the discrete user-specific search space is contained in one Component Carrier and comprises discrete physical downlink control channel candidates, and the discrete physical downlink control channel candidates is determined by a predefined interval;
wherein the predefined interval is determined by:
an aggregation level, a number of control channel resource units of the user-specific search space and a number of physical downlink control channel candidates; and
a detection module, which is connected to the third determination module and configured to detect the downlink control information on the discrete user-specific search space.
12. The device according to claim 11 , wherein the device further comprises:
a receiving module, which is connected to the third determination module and configured to receive a configuration, which is sent by the eNodeB and is for detecting a downlink control channel, of the control channel resources where the discrete user-specific search space is located, wherein the configuration of the control channel resources comprises that configurations at position of the frequency domain, which are corresponding to position of each time domain unit, of the downlink control channel are the same, or the position of frequency domain of the downlink control channel changes with the position of the time domain unit.
13. The method according to claim 1 , wherein the control channel resource comprises one of the following: a virtual resource block, a physical resource block and a control channel element.
14. The method according to claim 1 , wherein the control channel resource comprises one of the following: a virtual resource block, a physical resource block and a control channel element.
15. The method according to claim 1 , wherein the definition of the UE-specific search space can be represented by the following formula:
L
·
{
(
Y
k
+
m
′
·
⌊
N
k
M
(
L
)
·
L
⌋
)
mod
⌊
N
k
L
⌋
}
+
i
;
where N CCE,k is the control channel resources on a subframe k, M (L) is the number of the PDCCH candidates to be detected in the search space, i=0, . . . , L−1, L is the aggregation level; Y k =(A·Y k-1 )mod D, where Y −1 =n RNTI ≠0, A=39827, D=65537, k=└n s /2|, n s is a timeslot number in a radio frame; n RNTI is a corresponding radio network temporary identifier (RNTI); wherein under the scene that the UE does not configure the carrier instructions domain, m′=m.
16. The method according to claim 7 , wherein the definition of the UE-specific search space can be represented by the following formula:
L
·
{
(
Y
k
+
m
′
·
⌊
N
k
M
(
L
)
·
L
⌋
)
mod
⌊
N
k
L
⌋
}
+
i
;
where N CCE,k is the control channel resources on a subframe k, M (L) is the number of the PDCCH candidates to be detected in the search space, i=0, . . . , L−1, L is the aggregation level; Y k =(A·Y k-1 )mod D, where Y −1 =n RNTI ≠0, A=39827, D=65537, k=└n s /2|, n s is a timeslot number in a radio frame; n RNTI is a corresponding radio network temporary identifier (RNTI); wherein under the scene that the UE does not configure the carrier instructions domain, m′=m.
17. The device according to claim 9 , wherein the definition of the UE-specific search space can be represented by the following formula:
L
·
{
(
Y
k
+
m
′
·
⌊
N
k
M
(
L
)
·
L
⌋
)
mod
⌊
N
k
L
⌋
}
+
i
;
where N CCE,k is the control channel resources on a subframe k, M (L) is the number of the PDCCH candidates to be detected in the search space, i=0, . . . , L−1, L is the aggregation level; Y k =(A·Y k-1 )mod D, where Y −1 =n RNTI ≠0, A=39827, D=65537, k=└n s /2|, n s is a timeslot number in a radio frame; n RNTI is a corresponding radio network temporary identifier (RNTI); wherein under the scene that the UE does not configure the carrier instructions domain, m′=m.
18. The device according to claim 11 , wherein the definition of the UE-specific search space can be represented by the following formula:
L
·
{
(
Y
k
+
m
′
·
⌊
N
k
M
(
L
)
·
L
⌋
)
mod
⌊
N
k
L
⌋
}
+
i
;
where N CCE,k is the control channel resources on a subframe k, M (L) is the number of the PDCCH candidates to be detected in the search space, i=0, . . . , L−1, L is the aggregation level; Y k =(A·Y k-1 )mod D, where Y −1 =n RNTI ≠0, A=39827, D=65537, k=└n s /2|, n s is a timeslot number in a radio frame; n RNTI is a corresponding radio network temporary identifier (RNTI); wherein under the scene that the UE does not configure the carrier instructions domain, m′=m.