Transmission Method and System for Relay Physical Downlink Control Channel

• US 20130201899A1
• Filed: 03/23/2011
• Published: 08/08/2013
• Est. Priority Date: 05/05/2010
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Yuan, Ming, Bi, Feng, Liang, Feng, Yang, Jin, Wu, Shuanshuan, Dai, Bo, Xia, Shuqiang, Yuan, Yifei
• Granted Patent: US 9,179,325 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

The present invention discloses a transmission method and system for a Relay Physical Downlink Control Channel (R-PDCCH). The method comprises the steps of: an eNB bearing downlink grant information of a relay node onto an available Orthogonal Frequency Division Multiplex (OFDM) symbol of a first slot of a pre-allocated Physical Resource Block (PRB) pair used for bearing the R-PDCCH, wherein available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing a Physical Downlink Shared Channel (PDSCH) of each relay node (S602′); the eNB transmitting the PRB pair bearing the downlink grant information and the PDSCH to the relay node (S604′). The present invention is well applicable to a link between an eNB and a relay node, and meanwhile enables backhaul resources to be used adequately.

Claims

1. A transmission method for a Relay Physical Downlink Control Channel (R-PDCCH), comprising the steps of:

an enhanced Node B (eNB) bearing downlink grant information of a relay node onto an available Orthogonal Frequency Division Multiplex (OFDM) symbol of a first slot of a pre-allocated Physical Resource Block (PRB) pair used for bearing the R-PDCCH, wherein available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing a Physical Downlink Shared Channel (PDSCH) of each relay node; and

the eNB transmitting the PRB pair bearing the downlink grant information and the R-PDSCH to the relay node.

2. The method according to claim 1, wherein after the step of the eNB transmitting the PRB pair to the relay node, the method further comprises a step of:

the relay node demodulating the R-PDCCH using a Demodulation Reference Signal (DMRS) to obtain the downlink grant information and the PDSCH of the relay node.

3. The method according to claim 2, wherein for each relay node, which only has the downlink grant information, under the eNB, the eNB bears the downlink grant information and the PDSCH of each relay node onto the PRB pair according to one of the following modes:

applying a non-precoded DMRS to the first slot of the PRB pair, after the eNB completely or partially interleaves the downlink grant information of each relay node, the eNB bearing the completely or partially interleaved downlink grant information onto the available OFDM symbol of the first slot of the PRB pair, wherein the available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing the PDSCH of each relay node;

applying a non-precoded DMRS to the first slot of the PRB pair, the eNB bearing the downlink grant information of respective relay nodes onto available OFDM symbols of the first slots of different PRB pairs respectively, wherein the available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing the PDSCH of each relay node;

applying a precoded DMRS, the eNB bearing the downlink grant information of respective relay nodes onto available OFDM symbols of the first slots of different PRB pairs respectively, wherein the available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing the PDSCH of the relay node corresponding to the first slot of the PRB pair.

4. The method according to claim 1, wherein after the step of the eNB transmitting the PRB pair to the relay node, the method further comprises a step of:

the relay node demodulating the R-PDCCH using a Cell-Specific Reference Signal (CRS) to obtain the downlink grant information and the PDSCH of the relay node.

5. The method according to claim 4, wherein for each relay node, which only has the downlink grant information, under the eNB, the eNB bears the downlink grant information and the PDSCH of each relay node onto the PRB pair according to one of the following modes:

after the eNB completely or partially interleaves the downlink grant information of each relay node, the eNB bearing the completely or partially interleaved downlink grant information onto the available OFDM symbol of the first slot of the PRB pair, wherein all the available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing the PDSCH of each relay node;

the eNB bearing the downlink grant information of each relay node onto the available OFDM symbol of the first slot of the PRB pair, wherein a second slot of the PRB pair is used for bearing the PDSCH of each relay node.

6. A transmission system for an R-PDCCH, comprising:

an eNB, configured to bear downlink grant information of a relay node onto an available OFDM symbol of a first slot of a pre-allocated PRB pair used for bearing the R-PDCCH, wherein available OFDM symbols in the PRB pair, other than the OFDM symbol used for the downlink grant information, are used for bearing a PDSCH of each relay node;

the relay node, configured to demodulate out the downlink grant information and the PDSCH of the relay node from the PRB pair.

7. The system according to claim 6, wherein the relay node is configured to demodulate the R-PDCCH using a DMRS to demodulate out the downlink grant information and the PDSCH of the relay node from the PRB pair.

8. The system according to claim 6, wherein the relay node is configured to demodulate the R-PDCCH using a CRS to demodulate out the downlink grant information and the PDSCH of the relay node from the PRB pair.