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US 8,804,641 B2Granted
Method and device for detecting downlink control information
AssigneeZte Corporation
InventorsMing Yuan, Feng Bi, Feng Liang, Jin Yang, Shuanshuan Wu
Life of this patent
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Abstract
A method and a device for detecting downlink control information. The method includes: a Relay Node (RN) receiving control information born in a Relay Physical Downlink Control Channel (R-PDCCH) sent by an evolved Node B (eNB) to acquire a control resource; the RN performing detection on the control resource according to an index of the control resource to acquire own control information; wherein the control resource is a Relay Control Channel Element (R-CCE) or a Physical Resource Block (PRB). System overhead can be saved and system transmission efficiency can be improved.
Claims14
A method for detecting downlink control information, the method comprising:
- a relay node (RN) receiving downlink control information born in a relay physical downlink control channel (R-PDCCH) sent by an evolved Node B (eNB) to acquire a control resource;
- and
- the RN performing detection on the control resource according to an index of the control resource to acquire own control information;
- wherein the control resource is a Relay Control Channel Element (R-CCE) or a Physical Resource Block (PRB);
- the step of the RN performing detection on the control resource according to the index of the control resource to acquire own control information comprises:
- said RN acquiring a RN-specific search space according to a RN identity, a subframe number of a backhaul subframe, an aggregation level of a CCE/PRBs and a number of candidate control channels/PRBs;
- and
- the RN performing blind detection on the R-CCEs/PRBs in the RN-specific search space, and if a R-CCE/PRB matching with an own RN identity is detected, the downlink control information born in the R-CCEs/PRBs being RN's own control information;
- said RN-specific search space is:
- L□{(Yk+e)mod └Nk/L┘}+i
- where, Lε{1,2,4,8}, Lε{1,2,4}, Lε{1,2} or Lε{1}, and i=0, . . . , L−1, e=0, . . . , E(L)−1, and E(L) is the number of candidate control channels/PRBs, and Nk is a total number of R-CCEs for relay link transmission or a total number of PRBs semi-statically reserved by the eNB for the relay, Yk=(A*Yk-1)mod D, Y−1=nRNT1≠0, A=39827, D=65537, k is the subframe number of the backhaul subframe, and nRNT1 is a RN identity index;
- the number of candidate control channels/PRBs is 6, 4 or 2;
- the RN detects the downlink scheduling grant information (DL grant) in a 1st slot and detects the uplink scheduling grant information (UL grant) in a 2nd slot;
- a DL grant specific search space and a UL grant specific search space of the RN are both calculated as an above formula, where, L values are same or different when calculating the DL grant specific search space and the UL grant specific search space of the RN.
11 more elements
A device for detecting downlink control information, which is applied in a relay node, and the device comprising a receiving unit and a detecting unit, wherein
- the receiving unit is configured as:
- receiving control information born in a relay physical downlink control channel (R-PDCCH) sent by an evolved Node B (eNB) in a group of physical resource blocks (PRB) semi-statically reserved by the eNB for relay to acquire a control resource;
- the detecting unit is configured as:
- performing detection on the control resource acquired by the receiving unit according to an index of the control resource to acquire downlink control information of the RN;
- wherein the control resource is based on a R-CCE or a PRB;
- the detecting unit is configured as:
- performing detection on the control resource acquired by the receiving unit according to an index of the control resource to acquire downlink control information of the RN by:
- acquiring a RN-specific search space according to a RN identity, a subframe number of a backhaul subframe, an aggregation level of a CCE/PRBs and a number of candidate control channels/PRBs;
- and
- performing blind detection on the R-CCEs/PRBs in the RN-specific search space, and if a R-CCE/PRB matching with an own RN identity is detected, the downlink control information born in the R-CCEs/PRBs being RN's own control information;
- said RN-specific search space is:
- L□{(Yk+e)mod └Nk/L┘}+i
- where, Lε{1,2,4,8}, Lε{1,2,4}, Lε{1,2} or Lε{1}, and i=0, . . . , L−1, e=0, . . . , E(L)−1, and E(L) is the number of candidate control channels/PRBs, and Nk is a total number of R-CCEs for relay link transmission or a total number of PRBs semi-statically reserved by the eNB for the relay, Yk(A*Yk-1)mod D, Y−1=nRNT1≠0, A=39827, D=65537, k is the subframe number of the backhaul subframe, and nRNT1 is a RN identity index;
- the number of candidate control channels/PRBs is 6, 4 or 2;
- the detecting unit detects the downlink scheduling grant information (DL grant) in a 1st slot and detects the uplink scheduling grant information (UL grant) in a 2nd slot;
- a DL grant specific search space and a UL grant specific search space of the RN are both calculated as an above formula, where, L values are same or different when calculating the DL grant specific search space and the UL grant specific search space of the RN.
13 more elements
Dependencies are inferred from the claim text.