Method and device for R-PDCCH transmission in scenario of carrier aggregation

Patent metadata

Field	Value
Publication number	US-9955464-B2
Application number	US-201113994477-A
Country	US
Kind code	B2
Filing date	Dec 15, 2011
Priority date	Dec 15, 2010
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Disclosed are a method and device for R-PDCCH transmission in the scenario of carrier aggregation. By way of applying the technical solution of the embodiments of the present invention, multi-carrier aggregation transmission is supported between the relay node and the base station. The base station sends a component carrier carrying the R-PDCCH to the relay node and schedules the resources in each component carrier by way of the R-PDCCH carried in the component carrier. Thus what is achieved is that the base station communicates with the relay node by way of a plurality of aggregated component carriers, enabling the link transmission resources between the base station and the relay node to support multi-carrier PDCCH scheduling, improving the transmitting capacity of the link between the base station and the relay node, and improving the system performance.

First claim

The invention claimed is:

1. A method for Relay-Physical Downlink Control Channel (R-PDCCH) transmission in a carrier aggregation scenario, the method comprising:
receiving, at a relay node, multiple aggregated component carriers sent by a donor base station, one or more of the component carriers carrying R-PDCCH, R-PDCCH corresponding to each of the component carriers being separately coded;
carrying out blind decoding, by said relay node, on the component carriers carrying R-PDCCH, so as to acquire R-PDCCH which is used to schedule each of the component carriers; and
acquiring physical resources, by said relay node, on the corresponding component carriers according to said R-PDCCH, and carrying out information transmission with said base station through said physical resources, wherein the method further comprises:
for the one or more component carriers carrying the R-PDCCH, and the R-PDCCH corresponding to each component carrier being separately coded, said relay node receiving multi-aggregated component carriers corresponding to the R-PDCCH sent from the donor base station, and the R-PDCCH being carried by each component carrier to independently schedule the resources on each component carrier, or said relay node receiving multi-aggregated component carriers sent from the donor base station, one component carrier carries R-PDCCH corresponding to itself and R-PDCCH corresponding to other component carriers, and said R-PDCCH schedules the resources on the component carriers in a cross-carrier way, and
if the transmission mode of the R-PDCCH refers to an interleave mode, determining, by the relay node, a starting position of search spaces in each timeslot included in each subframe on the component carriers according to the transmission mode and aggregation level of the R-PDCCH, by:
said relay node determining the starting position of the search spaces via the formula below:
L ·{( Y k +m ′)mod └ N CCE,j R-PDCCH /L┘}+i,i= 0,1, . . . , L− 1,

where, L is the aggregation level of R-PDCCH;
N CCE,j R-PDCCH is the number of logical CCEs (Control Channel Element) included in the pre-configured possible transmission resource set of R-PDCCH, k is the number of a current subframe, and j is the number of a current timeslot in the subframe, jϵ{0,1};
when the R-PDCCH carried by each of the component carriers is used to schedule the resources on each of the component carriers independently, m′=m, when R-PDCCH is used to schedule the resources on the one of the component carriers and the other ones of the component carriers in the cross-carrier way, m′=m+M (L)·n CI , m is the number of blind decodings, and n CI is the identity information of the respective component carrier where the resources scheduled by R-PDCCH exist;
Y k =(A·Y k-1 ) mod D, Y −1 =n RNTI ≠0, n RNTI is RNTI of relay node, A=39827, D=65537, k=└n s /2┘, n s is the timeslot number in a current radio frame;
if the transmission mode of said R-PDCCH refers to a non-interleave mode, said relay node determining the starting position of the search spaces in each timeslot included in each subframe on the component carriers according to the transmission mode and aggregation level of R-PDCCH, by:
said relay node determining the starting position of the search spaces via the formula below:
( L·m′+i )mod N VRB R-PDCCH ,i= 0,1, . . . , L− 1,

where, L is the aggregation level of R-PDCCH;
N VRB R-PDCCH is the number of VRBs included in possible transmission resources set of R-PDCCH; and
when the R-PDCCH carried by each of the component carriers is used to schedule the resources on each of the component carriers independently, m′=m, when R-PDCCH schedules the resources on the one of the component carriers and the other ones of the component carriers in the cross-carrier way, m′=m+M(L)·n CI , m is the number of blind decodings, and n CI is the identity information of the respective component carrier where the resources scheduled by R-PDCCH exist.

2. The method according to claim 1 , wherein, when said R-PDCCH is used to schedule the resources on the one of the component carriers and other ones of the component carriers in the cross-carrier way, before said relay node receives multi-aggregated component carriers sent from the base station, the method further comprises: acquiring a corresponding relationship, at said relay node, configured by the base station, between the component carriers where the resources to be scheduled exist and the component carriers where R-PDCCH carrying the resources to be scheduled exist.

3. The method according to claim 2 , wherein at least one of:
when the R-PDCCH is carried by each of the component carriers and is used to schedule the resources on said component carriers independently, said relay node carrying out blind decoding on each of the component carriers, so as to acquire R-PDCCH information, which comprises said relay node carrying out blind decoding on the search space in each of the component carriers to acquire R-PDCCH information carried in each search space; and
when said R-PDCCH is used to schedule the resources on the one of the component carriers and the other ones of the component carriers in the cross-carrier way, said relay node carries out blind decoding on the component carriers carrying R-PDCCH, so as to acquire R-PDCCH information and identity information of the component carriers where the scheduled resources exist, which comprises at least one of:
when said component carriers carry said R-PDCCH through multiple independent search spaces respectively, said relay node carries out blind decoding on each of the search spaces to acquire the R-PDCCH information carried in each of the search spaces and the identity information of the component carriers where the scheduled resources exist; and
when said component carriers carry R-PDCCH through the shared search spaces, the relay node carries out blind decoding on the shared search spaces to acquire multiple R-PDCCH information carried in the search spaces and the identity information of the component carriers where the scheduled resources exist.

4. The method according to claim 3 , wherein said search spaces of the component carriers are determined in at least one of the following ways:
said relay node acquiring the transmission mode and the aggregation level of the R-PDCCH carried in the component carriers, the transmission mode including the interleave mode and the non-interleave mode; and
said relay node determining the starting position of the search spaces in each timeslot included in each subframe on the component carriers according to the transmission mode and aggregation level of the R-PDCCH.

5. The method according to claim 1 , wherein at least one of:
when the R-PDCCH is carried by each of the component carriers and is used to schedule the resources on said component carriers independently, said relay node carries out blind decoding on the component carriers carrying R-PDCCH, so as to acquire R-PDCCH which is used to schedule each of the component carriers, which comprises said relay node carrying out blind decoding on each of the component carriers, so as to acquire R-PDCCH information, and directly determining the R-PDCCH information acquired through blind decoding on each of the component carriers as the R-PDCCH is used to schedule the resources of the corresponding component carrier;
when said R-PDCCH is used to schedule the resources on the one of the component carriers and the other component carriers in the cross-carrier way, in said R-PDCCH, the method comprises multiple R-PDCCH information being used to schedule the resources on said one of the component carriers and the other ones of the component carriers, respectively, said R-PDCCH information comprising the identity information of the componen

Assignees

• Pan Xueming
• Shen Zukang
• Datang mobile communications equipment co ltd

Inventors

• Pan Xueming
• Shen Zukang

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/0032

  Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation · CPC title

• H04W72/12

  Wireless traffic scheduling · CPC title

• H04L5/0064

  Rate requirement of the data, e.g. scalable bandwidth, data priority · CPC title