CN102468910B

CN102468910B - Detection method of physical downlink control channel of RN and apparatus thereof

Info

Publication number: CN102468910B
Application number: CN201010539160.5A
Authority: CN
Inventors: 袁明; 毕峰; 梁枫; 杨瑾; 吴栓栓
Original assignee: ZTE Corp
Current assignee: Shenzhen Fu Hai Sunshine Technology Co Ltd
Priority date: 2010-11-10
Filing date: 2010-11-10
Publication date: 2015-07-22
Anticipated expiration: 2030-11-10
Also published as: CN102468910A; WO2012062179A1

Abstract

The invention provides a detection method of a physical downlink control channel (PDCCH) of a relay node (RN) and an apparatus thereof. The method comprises the following steps that: an RN monitors a first slot of a set of resource block (RB) pairs and then monitors a second slot of the set of the RB pairs; or, the RN simultaneously detects the first slot and the second slot of the set of the RB pairs, wherein an evolved universal terrestrial radio access network NodeB (eNB) carries out semi-static configuration in advance to configure the set of the RB pairs to the RN by a high level. According to the invention, it is ensured that low complexity is realized when an RN carries out blind detection on a PDCCH, so that whole system efficiency is improved.

Description

Method and device for detecting downlink control channel of Relay Node (RN)

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for detecting downlink control information of a relay node.

Background

This presents new challenges to wireless communication technologies as future wireless communication or cellular systems require increased coverage to support higher rate transmissions. At the same time, the cost of system construction and maintenance is more problematic. As transmission rates and communication distances increase, battery power consumption becomes more problematic, and future wireless communications will use higher frequencies, resulting in more severe path loss attenuation. In order to increase the coverage of high data rate, group mobility, temporary network deployment, improve the throughput at the cell edge, and provide services for users within the coverage hole of the cellular system, a Relay (Relay) technology is introduced into the wireless communication system, and therefore, the Relay technology is regarded as a key technology of 4G.

Long Term Evolution (LTE) systems, LTE-Advanced (LTE-a) systems, and International Mobile telecommunications (IMT-Advanced) systems are based on Orthogonal Frequency Division Multiplexing (OFDM) technology, and OFDM systems are two-dimensional data formats in time and Frequency. 1 subframe (subframe) is composed of 2 slots (slots), and each slot is composed of 7 OFDM symbols in case of normal Cyclic Prefix (CP); when the CP is extended, each slot consists of 6 OFDM symbols. Wherein, a Physical Downlink Control Channel (PDCCH) is located on the first 1 or 2 or 3 or 4 OFDM symbols of each subframe.

In LTE systems, the PDCCH design consists of several different components, each with its specific functionality. For convenience of description, several terms and conventions are described below:

1 Control information Element (CCE): consists of 36 REs and 9 REGs, and the information contained in the CCE is as follows: downlink scheduling grant Information (DL grant) and uplink scheduling grant Information (UL grant) of the user, and Information related to System Information (SI for short), random access (RA for short) response, and Paging (Paging).

Aggregation level L: the combination of CCEs, i.e., PDCCH, can only consist of L CCEs, wherein L ∈ {1, 2, 4, 8}, that is, PDCCH can only consist of a combination of 1 CCE (denoted by 1-CCE), a combination of 2 CCEs (denoted by 2-CCE), a combination of 4 CCEs (denoted by 4-CCE) and a combination of 8 CCEs (denoted by 8-CCE), and the 4 different combinations respectively correspond to 4 different coding rates, i.e., the coding rate of 1-CCE is 2/3, the coding rate of 2-CCE is 1/3, the coding rate of 4-CCE is 1/6, and the coding rate of 8-CCE is 1/12.

3. Different CCE aggregation levels have the number of corresponding candidate control channels, namely the maximum number of blind detection. For example, UE-specific Search Space: the number of candidate control channels of 1-CCE is 6, namely the blind detection times according to a group of 1 CCE does not exceed 6; the number of the candidate control channels of the 2-CCE is 6, namely the blind detection times according to a group of 2 CCEs are not more than 6; the number of candidate control channels of the 4-CCE is 2, namely the blind detection times according to a group of 4 CCEs is not more than 2; the candidate control channels of 8-CCE are 2, i.e. the blind detection times in a group of 8 CCEs are not more than 2. Under UE-common Search Space, 4 candidate control channels of 4-CCE are provided, namely the blind detection times according to a group of 4 CCE are not more than 4; the candidate control channels of 8-CCE are 2, i.e. the blind detection times in a group of 8 CCEs are not more than 2.

The detailed process of UE blind detection on PDCCH in LTE system:

at the Evolved base station (eNB) (where eNB is also referred to as Evolved base station, E-UTRAN NodeB, where E-UTRAN is Evolved Universal Terrestrial Radio Access Network)

Step 1: respectively carrying out channel coding on control information carried by the PDCCH of each UE;

step 2: the coded control information carried by the PDCCHs of all the UE is concatenated and scrambled by a sequence special for a cell;

and 3, step 3: performing Quadrature Phase Shift Keying (QPSK) modulation, obtaining a series of CCEs corresponding to control information carried by all PDCCHs at this time, and numbering them from 0; the downlink control channel at this time is assumed to be composed of 32 CCEs in total, that is, the numbers of the CCEs are CCE 0, CCE 1,. and CCE 31;

and 4, step 4: interleaving the series of CCEs by taking the REG as a unit and then mapping the interleaved CCEs onto the RE;

and 5, step 5: after Inverse Fast Fourier Transform (IFFT), the signal is transmitted.

At the UE end, the UE side is,

step 1: after Fast Fourier Transform (FFT) is performed on the receiving end, and deinterleaving is performed, a series of CCEs with the same number as that of the eNB is obtained.

Step 2: the UE starts to perform blind detection from the combination of 1-CCE, firstly calculates the initial position of the 1-CCE according to the parameters of the Identity (ID), the subframe number and the like, namely, the UE starts to perform blind detection from the CCE with the number of the CCEs, and then determines the search space according to the number of the candidate control channels. For example, if the starting position of 1-CCE is CCE 5, the search space of the UE is { CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, and CCE 10 }. That is, the UE performs blind detection on [ CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE 10] respectively.

And 3, step 3: and if the UE does not detect the UE ID matched with the UE when the blind detection is carried out according to the combination of 1-CCE, carrying out the blind detection from the combination of 2-CCE. Firstly, the initial position of the 2-CCE still needs to be calculated according to the parameters of the UE-ID, the subframe number and the like of the user, and then the search space is determined according to the number of the candidate control channels. For example, if the starting position of 2-CCE is CCE 10, the search space of UE is { [ CCE 10CCE 11], [ CCE 12CCE 13],. and [ CCE 20CCE 21] }. That is, the UE performs blind detection on [ CCE 10CCE 11], [ CCE 12CCE 13],. and [ CCE 20CCE 21], respectively. And so on.

And 4, step 4: if the UE does not monitor the UE ID matched with the UE in the whole blind detection process, the UE is switched to a sleep mode if the UE does not issue the control signaling belonging to the UE at the moment; if the UE ID matched with the UE is monitored, the UE demodulates the corresponding service information according to the indication of the control signaling.

As shown in fig. 1, a mobile communication system architecture diagram of a relay node RN is introduced, in the mobile communication system, a Link between a base station (eNB) and the RN is referred to as a relay Link (also referred to as a Un Link), a Link between the RN and a User Equipment (UE) under its coverage is referred to as an Access Link (also referred to as a Uu Link), and a Link between the eNB and the UE under its coverage is referred to as a Direct Link (Direct Link). For eNB, RN is equivalent to one UE; for the UE, the RN is equivalent to the eNB.

Currently, when an in-band relay (inband relay) scheme is adopted, that is, the Un Link and the Uu Link use the same frequency band, in order to avoid interference of transmission and reception of the RN itself, the RN cannot simultaneously perform transmission and reception operations on the same frequency resource. When the RN transmits downlink control information to its subordinate UE, it cannot receive the downlink control information from the eNB. Therefore, in Downlink transmission, the RN first transmits Downlink control information to its subordinate UEs on the first 1 or 2 OFDM symbols, then performs a handover from transmission to reception within a time range (as shown in the figure, at an interval gap), and after the handover is completed, receives data from the eNB on the following OFDM symbols, where the data includes a Downlink control Channel (R-PDCCH) and a Physical Downlink Shared Channel (R-PDSCH), as shown in fig. 2, that is, the Downlink control Channel transmitted by the eNB to the RN is carried on a Physical Resource Block (RB).

On a downlink backhaul subframe, an eNB semi-statically configures a group of RBs through a higher layer for transmission of an R-PDCCH, wherein the RBs include information such as a downlink scheduling grant (DL grant) and an uplink scheduling grant (UL grant) of an RN. As shown in fig. 3, under normal CP, the PDCCH of the UE is transmitted on the first n (n is less than or equal to 3) OFDM symbols of the 1 st slot, and the DLgrant is transmitted on 4 OFDM symbols of the 1 st slot, where the starting position is the 4 th OFDM symbol and the ending position is the 7 th OFDM symbol; the UL grant is transmitted only on all available OFDM symbols of the 2 nd slot.

The transmission mode of the R-PDCCH includes two modes of interleaving and non-interleaving. The interleaved R-PDCCH (interleaved R-PDCCH) refers to that DL grants of all RNs are interleaved and then transmitted on available resources of the 1 st slot, and UL grants of all RNs are interleaved and then transmitted on available resources of the 2 nd slot, that is, the R-PDCCH carrying multiple RNs in 1 PRB pair. The non-interleaved R-PDCCH (non-interleaved R-PDCCH) means that the eNB configures 1 or more dedicated PRB pairs for the RN to carry the R-PDCCH, a DL grant of the RN is transmitted on an available resource of a 1 st time slot, and a UL grant of the RN is transmitted on an available resource of a 2 nd time slot, that is, only the R-PDCCH of the same RN can be carried in 1 PRB pair.

Currently, in the research of Relay, the detection method of the R-PDCCH is a hot issue in the discussion of 3 GPP. For the detection of the interleaved R-PDCCH, a detection method of a PDCCH which uses LTE Rel-8 is adopted, and for the detection of the non-interleaved R-PDCCH, the current conclusion is that RN monitors the 1 st time slot to obtain a DL grant and monitors the 2 nd time slot to obtain a ULgrant, but for the specific detection method of the R-PDCCH under non-interleaving, no solution is provided at present.

Disclosure of Invention

The present invention is directed to a method and an apparatus for detecting a downlink control channel of a relay node RN, so as to at least solve the above problem.

The RN monitors the 1 st time slot of a group of resource block pairs RB pair, and then monitors the 2 nd time slot of the group of RB pair; or, the RN detects the 1 st slot and the 2 nd slot of the set of RB pair at the same time, where the set of RB pair is configured semi-statically in advance for the RN by the base station eNB through a higher layer.

Further, the RN first monitors the 1 st timeslot of the set of RB pairs, and when a DL grant is not detected, if the RN determines that there is data transmission in the 1 st timeslot, the RN stops monitoring the 2 nd timeslot.

Further, the RN first monitors the 1 st timeslot of the set of RB pairs, and when a DL grant is not detected, if the RN determines that there is no data transmission in the 1 st timeslot, the RN continues to monitor the 2 nd timeslot.

Further, the step of the RN simultaneously listening to the 1 st slot and the 2 nd slot of the set of RB pair includes, after the step of the RN: the RN detects the DL grant and/or the UL grant.

Further, when the RN has an uplink transmission requirement, the 2 nd timeslot is directly monitored.

Further, the listening for the set of RBs comprises: the step of monitoring the set of RB pair comprises: and the RN monitors the group of RB pairs according to a parameter level set aggregation level L from the 1 st RB pair of the group of RB pairs.

Further, the step that the RN monitors the set of RB pairs according to an aggregation level L from the 1 st RB pair of the set of RB pairs includes: the number of the R-PDCCH candidate control channels corresponding to an aggregation level L ═ 1 is 6 or 8, the RN performs blind detection 6 times or 8 times by taking 1 RB pair as a group from the 1 st RB pair of the group of RB pairs, wherein the size of the search space of the RN is 6 or 8 RB pairs; the number of R-PDCCH candidate control channels corresponding to an aggregational level L ═ 2 is 8, 6, 5, 4, or 3, and the RN performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times by using 2 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, wherein the search space size of the RN is 16, 12, 10, 8, or 6 rbpairs in sequence; the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 4 is 4, 3, 2, or 1, the RN performs blind detection 4 times, 3 times, 2 times, or 1 time by 4 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, and the search space size of the RN is 16 or 12 or 8 or 4 RB pairs in sequence; the number of the R-PDCCH candidate control channels corresponding to the aggregation level L-8 is 2 or 1, and the RN performs blind detection 2 times or 1 time by using 8 RB pairs as a group from the 1 st RB pair of the group of rbpairs, wherein the size of the search space of the RN is 16 or 8 RB pairs.

According to another aspect of the present invention, there is provided a device for monitoring a downlink control channel of a relay node RN, including: a monitoring module, configured to monitor the 1 st slot and the 2 nd slot in a group of resource block pairs RB pair; the control module is used for controlling the monitoring module to monitor the 1 st time slot of a group of resource blocks RB pair firstly and then monitor the 2 nd time slot of the group of RB pair; or, controlling the monitoring module to detect the 1 st slot and the 2 nd slot of the set of RB pair at the same time, where the set of RB pair is configured semi-statically in advance for the RN by the base station eNB through a high layer.

Further, still include: a detecting module, configured to detect the DL grant and/or the UL grant when the monitoring module monitors the set of RB pairs first; the judging module is used for judging whether data transmission exists on the 1 st time slot or not when the detection result of the detecting module is negative; the control module is further configured to control the monitoring module to stop monitoring the 2 nd time slot if the determination result of the determining module is yes; and under the condition that the judgment result of the judgment module is negative, controlling the monitoring module to continue monitoring the 2 nd time slot.

Further, the monitoring module is further configured to monitor the resource block RBpair according to an aggregation level L in the following manner: the number of the R-PDCCH candidate control channels corresponding to the aggregation level L ═ 1 is 6 or 8, and the monitoring module performs blind detection 6 times or 8 times from the 1 st RB pair of the set of RB pairs by using 1 RB pair as a set, wherein the size of the search space of the monitoring module is 6 or 8 RB pairs; the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 2 is 8, 6, 5, 4, or 3, and the monitoring module performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times from the 1 st RB pair of the set of RB pairs, with 2 RB pairs as a set, wherein the search space size of the monitoring module is 16, 12, 10, 8, or 6 RB pairs in sequence; the number of R-PDCCH candidate control channels corresponding to an aggregational level L ═ 4 is 4, 3, 2, or 1, the monitoring module performs blind detection 4 times, 3 times, 2 times, or 1 time by taking 4 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, wherein the size of the search space of the monitoring module is 16 or 12 or 8 or 4 RB pairs in sequence; the number of R-PDCCH candidate control channels corresponding to the aggregation level L ═ 8 is 2 or 1, and the monitoring module performs blind detection 2 times or 1 time by using 8 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, where the size of the search space of the monitoring module is 16 or 8 RB pairs.

The invention solves the problem of how to search the downlink control channel of the relay node after the relay node is introduced into an LTE-A system through the detection method and the detection device of the non-interlaced downlink control channel of the relay node. The method can be well suitable for the relay node, ensures that the relay node has lower complexity when the downlink control channel is detected in a blind mode, and improves the efficiency of the whole system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a framework of a basic system of the prior art after a Relay is introduced;

fig. 2 is a frame structure diagram of a downlink backhaul subframe in the prior art;

FIG. 3 is a diagram of prior art R-PDCCH versus PDCCH location;

fig. 4 is a schematic diagram of a method for detecting downlink control information of a relay node according to a first embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a method for detecting downlink control information of a relay node according to a second embodiment of the present invention;

fig. 6 is a schematic diagram of a method for detecting downlink control information of a relay node according to a third embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a method for detecting downlink control information of a relay node according to a fourth embodiment of the present invention;

fig. 8 is a schematic structural diagram of an apparatus for detecting downlink control information of a relay node according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a detection apparatus for downlink control information of a relay node according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

According to an embodiment of the present invention, a method for detecting a downlink control channel of a relay node RN is provided, where the method includes:

the RN monitors the 1 st time slot of a group of resource block pairs RB pair, and then monitors the 2 nd time slot of the group of RB pair; alternatively, the RN may simultaneously detect the 1 st slot and the 2 nd slot of the set of RB pairs, where the set of RB pairs is semi-statically configured in advance for the RN by the base station eNB through a higher layer.

By the embodiment, the good channel condition of backhaul link is fully utilized, and the complexity of the RN for detecting the R-PDCCH is greatly simplified. The method can be well suitable for the relay node, saves the system overhead and improves the transmission efficiency of the system.

The RN first monitors the 1 st timeslot of the set of RB pairs, and stops monitoring the 2 nd timeslot if the RN determines that there is data transmission in the 1 st timeslot when the downlink grant DL grant is not detected. The RN first monitors the 1 st slot of the set of RB pairs, and when the DL grant is not detected, if the RN determines that there is no data transmission in the 1 st slot, the RN continues to monitor the 2 nd slot. The method includes, after the step of the RN simultaneously monitoring the 1 st slot and the 2 nd slot of the set of RB pair: the RN detects the DLgrant and/or the UL grant.

And when the RN has an uplink transmission requirement, directly monitoring the 2 nd time slot. The step of monitoring the set of RB pair includes: and the RN monitors the set of RB pair according to a parameter level set aggregationlevel L from the 1 st RB pair of the set of RB pair.

The step that the RN monitors the set of RB pairs according to an aggregation level L from the 1 st RB pair of the set of RB pairs includes: the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 1 is 6 or 8, and the RN performs blind detection 6 times or 8 times for a group of 1 PRB pair, starting from the 1 st RB pair of the group of RB pairs, where the search space size of the RN is 6 or 8 PRB pairs; the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 2 is 8, 6, 5, 4, or 3, and the RN performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times for each set of 2 RB pairs starting from the 1 st RB pair of the set of RB pairs, where the search space size of the RN is 16, 12, 10, 8, or 6 RB pairs in this order; the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 4 is 4, 3, 2, or 1, and the RN performs blind detection 4 times, 3 times, 2 times, or 1 time for each set of 4 RB pairs starting from the 1 st RB pair of the set of RB pairs, where the search space size of the RN is 16 or 12 or 8 or 4 RB pairs in order; the number of R-PDCCH candidate control channels corresponding to the aggregation level L ═ 8 is 2 or 1, and the RN performs blind detection 2 times or 1 time for each set of 8 RB pairs starting from the 1 st RB pair of the set of RB pairs, where the search space size of the RN is 16 or 8 RB pairs.

Example one

In this embodiment, the R-PDCCH of the RN does not include a DLgrant, and determines that there is data transmission in the 1 st slot. The eNB configures 12 RB pairs for RN in a semi-static manner in advance through a high layer to carry R-PDCCH, and the numbers of the RB pairs are RB pair0, RBpair1, and RB pair 11. The 12 RB pairs are logically continuous, but may be physically continuous or discrete, and fig. 4 is a schematic diagram of a method for detecting downlink control information of a relay node according to embodiment 1 of the present invention, as shown in fig. 4:

1) the RN first detects the 1 st slot of the 12 RB pairs:

starting from aggregation level L ═ 1, RN performs detection on a set of 1 RB pair from the 1 st RB pair of the set of RB pairs, and the corresponding R-PDCCH candidate control channels are 8, that is, detected 8 times in total, at this time, the search space size is 8 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-2, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 2 RB pairs, the corresponding R-PDCCH candidate control channels are 6, namely, the detection is carried out for 6 times, and at this time, the size of the search space is 12 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-4, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 4 RB pairs, the corresponding R-PDCCH candidate control channels are 3, namely 3 times in total, and at this time, the size of the search space is 12 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-8, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 8 RB pairs, the corresponding R-PDCCH candidate control channels are 1, namely 1 time in total, and at this time, the size of the search space is 8 RB pairs.

With this embodiment, in the detection process of any RB pair combination, the RN does not detect the corresponding DL grant, and determines that there is data transmission in the 1 st slot in the detection process, so that it indicates that there is no uplink grant in the 2 nd slot, and the RN does not continue to detect the 2 nd slot of the set of RB pairs. The method for detecting the non-interlaced downlink control channel of the relay node solves the problem of how the relay node searches the downlink control channel of the relay node after the relay node is introduced into an LTE-A system. The method may be well suited for relay nodes. The RN does not continue to detect the 2 nd time slot of the group of RB pair, so that the relay node is ensured to have lower complexity when the relay node blindly detects the downlink control channel, and the efficiency of the whole system is improved.

Example two

In this embodiment, the R-PDCCH of the RN does not include a DL grant, and determines that there is no data transmission in the 1 st slot. The eNB configures 10 RB pairs for the RN in a semi-static manner in advance through a high layer to carry the R-PDCCH, and the numbers are RB pair0, RB pair 1. The 10 RB pairs are logically continuous, but may be physically continuous or discrete, fig. 5 is a schematic diagram of a method for detecting downlink control information of a relay node according to a second embodiment of the present invention, as shown in fig. 5:

1) the RN first detects the 1 st slot of the 10 RB pairs:

the RN starts to detect with an aggregation level L ═ 1, and starts to detect with a set of 1 RB pair from the 1 st RB pair of the set of RB pairs, and the corresponding R-PDCCH candidate control channels are detected 6 times, that is, 6 times in total, and at this time, the search space size is 6 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-2, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 2 RB pairs, the corresponding R-PDCCH candidate control channels are 5, namely, the detection is carried out for 5 times in total, and at this time, the size of the search space is 10 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-4, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 4 RB pairs, the corresponding R-PDCCH candidate control channels are 2, namely, the detection is performed according to the set of 4 RB pairs for 2 times, and at this time, the size of the search space is 8 RB pairs.

In the detection process of any RB pair combination, the RN does not detect the corresponding DL grant, and determines that there is no data transmission in the 1 st slot in the detection process, which means that the 1 st slot is empty, so there may be UL grant transmission in the 2 nd slot, and the RN needs to continue to detect the 2 nd slot of the set of RB pairs to obtain the UL grant.

2) The RN detects the 2 nd slot of the 10 RB pairs according to the aggregation level L ═ {1, 2, 4, 8}, and the detection method is the same as 1).

If the corresponding UL grant is detected in the detection process of any RB pair combination, the RN stops detecting. If no corresponding UL grant is detected in the detection process of any RB pair combination, it indicates that there is no uplink grant or downlink grant of the RN on the downlink backhaul subframe.

In the method for detecting the non-interleaved downlink control channel of the relay node, the 1 st time slot is detected first, and the 2 nd time slot is detected under the condition that no data transmission exists on the 1 st time slot, so that the relay node is ensured to have lower complexity when the downlink control channel is detected in a blind manner, and the efficiency of the whole system is improved.

EXAMPLE III

In this embodiment, the RN simultaneously monitors the 1 st slot and the 2 nd slot of the set of RB pair. The eNB configures 8 RB pairs for the RN in a semi-static manner in advance through a high layer to carry the R-PDCCH, and the numbers of the RB pairs are RB pair0, RB pair 1. Fig. 6 is a schematic diagram of a method for detecting downlink control information of a relay node according to a third embodiment of the present invention, and is shown in fig. 6:

the RN simultaneously detects the 1 st time slot and the 2 nd time slot of the 8 RB pair, and adopts the same detection method:

starting from aggregation level L ═ 1, RN detects in groups of 1 RB pair starting from the 1 st RB pair of the group of RB pairs, and the corresponding R-PDCCH candidate control channels are 6, that is, DL grant and UL grant are detected 6 times each, and at this time, the search space sizes of DL grant and UL grant are both 6 RB pairs.

If the RN does not detect the DL grant or the UL grant which is matched with the RN ID of the RN, the RN continues to detect from the aggregation level L of 2, the RN detects from the 1 st RB grant of the set of RB grants according to a set of 2 RB grants, the number of corresponding R-PDCCH candidate control channels is 4, namely the DL grant and the UL grant are detected for 4 times respectively, and at this time, the search space sizes of the DL grant and the UL grant are both 8 RB grants.

If the RN does not detect the DL grant or the UL grant which is matched with the RN ID of the RN, the RN continues to detect from the aggregation level L-4, the RN detects from the 1 st RB grant of the set of RB grants according to a set of 4 RB grants, the corresponding R-PDCCH candidate control channels are 1, namely, the detection is carried out according to a set of 2 RB grants, and the DL grant and the UL grant are detected 2 times respectively, wherein the search space sizes of the DL grant and the UL grant are both 8 RB grants.

If the RN does not detect the DLgrant or the ULgrant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L of 8, the RN detects from the 1 st RB pair of the set of RB pairs according to a set of 8 RB pairs, the corresponding R-PDCCH candidate control channels are 1, namely the RN detects according to the set of 8 RB pairs for 1 time, and at this time, the size of the search space is 8 RB pairs.

If the corresponding DL grant or UL grant is detected in the detection process of any RB pair combination, the RN stops detecting. If the RN does not detect the corresponding DL grant or UL grant in the detection process of any RB pair combination, it indicates that there is no downlink grant or uplink grant of the RN on the downlink backhaul subframe.

In the detection method of the non-interleaved downlink control channel of the relay node according to the embodiment, in the detection process, when the corresponding DL grant or UL grant is detected, the RN stops the detection.

Example four

In this embodiment, after the RN detects a DLgrant at the 1 st slot of the RB pair, it preferentially detects a UL grant at the 2 nd slot of 1 or more RB pairs where the DLgrant is located.

The eNB configures 15 RB pairs for the RN in a semi-static manner in advance through a high layer to carry the R-PDCCH, and the numbers of the RB pairs are RBpair0, RB pair 1. The 15 RB pairs are logically continuous, but may be physically continuous or discrete, and fig. 7 is a schematic diagram of a method for detecting downlink control information of a relay node according to a fourth embodiment of the present invention, as shown in fig. 7:

1) the RN first detects the 1 st slot of the 16 RB pairs:

the RN starts to detect with an aggregation level L ═ 1, and starts to detect with a set of 1 RB pair from the 1 st RB pair of the set of RB pairs, and the corresponding R-PDCCH candidate control channels are 8, that is, detected 8 times in total, at this time, the search space size is 8 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-2, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 2 RB pairs, the corresponding R-PDCCH candidate control channels are 8, namely, the detection is carried out for 8 times in total, and at this time, the size of the search space is 16 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-4, the RN detects from the 1 st RB pair of the set of RB pairs in a set of 4 RB pairs, the corresponding R-PDCCH candidate control channels are 4, namely, the detection is carried out for 4 times, and at this time, the size of the search space is 16 RB pairs.

If the RN does not detect the DL grant matching with the RN ID of the RN, the RN continues to detect from the aggregation level L-8, the RN detects from the 3 rd RB pair of the set of RB pairs in a set of 8 RB pairs, the corresponding R-PDCCH candidate control channels are 2, namely, the detection is carried out for 2 times, and at this time, the size of the search space is 16 RB pairs.

If in the detection process of the aggregation level L ═ 4 combination, RN detects that the corresponding DL grant is carried in the 1 st slot of RB pair4, RB pair5, RB pair6 and RB pair 7.

2) After detecting the DLgrant, the RN preferentially detects the 2 nd slots of RB pair4, RB pair5, RB pair6 and RB pair 7:

starting from RB pair5, the 2 nd slots of RB pair4, RB pair5, RB pair6 and RB pair7 are detected first according to the aggregation level L ═ 1, for a total of 4 times. If the RN does not detect the UL grant matching its own RN ID, the 2 nd time slots of { RB pair4, RB pair5} and { RB pair6, RBpair7} are continuously detected according to the aggregation level L ═ 2 for 2 times. If the ULgrant matching the RN self-RN ID is not detected, the 2 nd time slot of { RB pair4, RB pair5, RB pair6 and RB pair7} is continuously detected according to the aggregation level L-4 for 1 time.

In the above detection process, once the corresponding UL grant is detected, the RN immediately stops the detection.

If the RN still does not detect the UL grant in the above detection process, the RN detects the 2 nd slot of the 16 RB pairs again according to the aggregation level L ═ 1, 2, 4, 8, and the detection method is the same as 1).

According to the detection method of the non-interlaced downlink control channel of the relay node, disclosed by the embodiment of the invention, the RN immediately stops detection when the corresponding ULgrant is detected, the method can be well suitable for the relay node, the relay node is ensured to have lower complexity when the downlink control channel is detected in a blind manner, and the efficiency of the whole system is improved.

EXAMPLE five

After the RN sends an uplink transmission request to the eNB on a certain uplink backhaul subframe, the RN preferentially monitors the 2 nd timeslot of the group of RB pair on the next downlink backhaul subframes until detecting the UL grant, and starts uplink data transmission. Wherein the detection method is as described above.

According to the embodiment of the invention, the invention also provides a device for monitoring the downlink control channel of the RN. Fig. 8 is a schematic structural diagram of an apparatus for detecting downlink control information of a relay node according to an embodiment of the present invention, and as shown in fig. 8, the apparatus includes: a monitoring module 2 and a control module 4. A monitoring module 2, configured to monitor the 1 st time slot and the 2 nd time slot in a group of resource block pairs RB pair; the control module 4 is configured to control the monitoring module 2 to monitor the 1 st time slot of a group of resource blocks RB pair first and then monitor the 2 nd time slot of a group of RB pair; or, the control monitoring module 2 detects the 1 st time slot and the 2 nd time slot of a set of RB pair at the same time, where the set of RB pair is configured semi-statically in advance for the RN by the base station eNB through a higher layer.

The device provided by the embodiment controls the monitoring module 4 to monitor through the control module 2, and can be well applied to the relay node, thereby ensuring that the relay node has lower complexity when blindly detecting the downlink control channel, and improving the efficiency of the whole system.

Preferably, the present invention provides a device for monitoring a downlink control channel of a relay node RN, further comprising: a detection module 6 and a judgment module 8, and fig. 9 is a schematic structural diagram of a detection apparatus for downlink control information of a relay node according to an embodiment of the present invention. The above-described apparatus is described in detail below with reference to fig. 9.

A monitoring module 2, configured to monitor the 1 st time slot and the 2 nd time slot in a group of resource block pairs RB pair; the control module 4 is connected to the monitoring module 2, and is configured to control the monitoring module 2 to monitor the 1 st time slot of a group of resource blocks RB pair first and then monitor the 2 nd time slot of the group of RB pair; or, controlling the monitoring module 2 to detect the 1 st time slot and the 2 nd time slot of the set of RB pair at the same time, where the set of RB pair is configured semi-statically in advance for the RN by a base station eNB through a high layer; a detecting module 6, connected to the control module 4, configured to detect a downlink grant DL grant when the monitoring module 2 monitors the 1 st timeslot of the set of RBpair first; a judging module 8, configured to judge whether there is data transmission in the 1 st timeslot if the detection result of the detecting module 6 is negative; the control module 4 is further configured to control the monitoring module 2 to stop monitoring the 2 nd time slot if the determination result of the determining module 8 is yes; and under the condition that the judgment result of the judgment module 8 is negative, controlling the monitoring module 2 to continue monitoring the 2 nd time slot.

The monitoring module 2 is further configured to monitor the resource block RB pair according to an aggregation level L in the following manner:

the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 1 is 6 or 8, and the monitoring module 2 performs blind detection 6 times or 8 times from the 1 st RB pair of the set of RB pairs, with 1 RB pair as a set, where the size of the search space of the monitoring module 2 is 6 or 8 RB pairs;

the number of R-PDCCH candidate control channels corresponding to the aggregation level L ═ 2 is 8, 6, 5, 4, or 3, and the monitoring module 2 performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times from the 1 st RB pair of the set of RB pairs, with 2 RB pairs as a set, where the search space size of the monitoring module 2 is 16, 12, 10, 8, or 6 RB pairs in sequence;

the number of R-PDCCH candidate control channels corresponding to aggregation L ═ 4 is 4, 3, 2, or 1, and the monitoring module 2 performs blind detection 4 times, 3 times, 2 times, or 1 time by taking 4 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, where the search space size of the monitoring module 2 is 16, or 12, or 8, or 4 RBs in sequence;

the number of R-PDCCH candidate control channels corresponding to aggregation L ═ 8 is 2 or 1, and the monitoring module 2 performs blind detection 2 times or 1 time by using 8 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, where the size of the search space of the monitoring module 2 is 16 or 8 RB pairs.

The following describes in detail the implementation process of the apparatus for monitoring a downlink control channel of the relay node RN by using an embodiment. Firstly, a control module 4 determines a mode of monitoring a time slot in a group of resource blocks RB pair by a monitoring module 2, wherein the mode comprises monitoring the 1 st time slot of the group of resource blocks RB pair firstly and then monitoring the 2 nd time slot of the group of RB pair; or monitoring the 1 st time slot and the 2 nd time slot simultaneously; secondly, the monitoring module 2 completes the monitoring of the time slot in the resource block RB pair according to the monitoring mode, assuming that the determined monitoring mode is to monitor the first time slot in the resource block first and then monitor the second time slot in the resource block, and the specific monitoring steps are as follows: the monitoring module 2 monitors the resource blocks RB pair according to an aggregation level L, where the number of R-PDCCH candidate control channels corresponding to the aggregation level L1 is 6 or 8, and the monitoring module 2 performs blind detection 6 times or 8 times from the 1 st RB pair of the set of RBs by using 1 RB pair as a set, where the size of the search space of the monitoring module 2 is 6 or 8 RB pairs; the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 2 is 8, 6, 5, 4, or 3, and the monitoring module 2 performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times by using 2 RB pairs as a group, starting from the 1 st RB pair of the group of RBs, where the size of the search space of the monitoring module 2 is 16, 12, 10, 8, or 6 RB pairs in sequence; the number of R-PDCCH candidate control channels corresponding to aggregation L ═ 4 is 4, 3, 2, or 1, and the monitoring module 2 performs blind detection 4 times, 3 times, 2 times, or 1 time by taking 4 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, where the search space size of the monitoring module 2 is 16, or 12, or 8, or 4 RB pairs in sequence; the number of the R-PDCCH candidate control channels corresponding to aggregation L ═ 8 is 2 or 1, and the monitoring module 2 performs blind detection 2 times or 1 time from the 1 st RBpair of the set of RB pairs by using 8 RB pairs as a set, where the size of the search space of the monitoring module 2 is 16 or 8 RB pairs. In the above monitoring process, once the determining module 8 determines that there is no matching DL grant in the 1 st timeslot but there is data transmission, the control module 4 controls the monitoring module 2 to stop monitoring the RB pair continuously, and if there is no DL grant or other data, the control module 4 controls the monitoring module 2 to monitor the second timeslot of the RB pair continuously.

The detection device of the non-interlaced downlink control channel of the relay node solves the problem of how the relay node searches the downlink control channel of the relay node after the relay node is introduced into an LTE-A system. The device can be well suitable for the relay node, ensures that the relay node has lower complexity when the downlink control channel is detected in a blind mode, and improves the efficiency of the whole system.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting a downlink control channel of a Relay Node (RN),

the RN monitors the 1 st time slot of a group of resource block pairs RB pair, and then monitors the 2 nd time slot of the group of RB pair; or,

the RN simultaneously detects the 1 st time slot and the 2 nd time slot of the set of RB pair, wherein the set of RB pair is configured semi-statically in advance for the RN by a base station eNB through a high layer.

2. The method of claim 1, wherein the RN first listens to the 1 st slot of the set of RB pairs, and stops listening to the 2 nd slot if the RN determines that there is data transmission in the 1 st slot when a downlink grant DL grant is not detected.

3. The method of claim 1, wherein the RN listens to the 1 st slot of the set of RB pairs first, and when no DL grant is detected, if the RN determines that there is no data transmission on the 1 st slot, the RN continues to listen to the 2 nd slot.

4. The method of claim 1, wherein the step of the RN simultaneously listening for the 1 st slot and the 2 nd slot of the set of RB pair comprises, after the step of the RN:

the RN detects a DL grant and/or a UL grant.

5. The method according to any of claims 1 to 4, wherein the 2 nd slot is listened to directly when the RN has uplink transmission demand.

6. The method of any of claims 1 to 4, wherein the step of listening for the set of RB pair comprises: and the RN monitors the set of RB pair according to a parameter level set aggregationlevel L from the 1 st RB pair of the set of RB pair.

7. The method of claim 6, wherein the RN listens to the set of RB pairs according to an aggregation level L starting from the 1 st RB pair of the set of RB pairs, and wherein the RN listens to the set of RB pairs according to an aggregation level L comprises:

the number of the R-PDCCH candidate control channels corresponding to an aggregation level L ═ 1 is 6 or 8, the RN performs blind detection 6 times or 8 times by taking 1 RB pair as a group from the 1 st RB pair of the group of RB pairs, wherein the size of the search space of the RN is 6 or 8 RB pairs;

the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 2 is 8, 6, 5, 4, or 3, and the RN performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times by using 2 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, wherein the search space size of the RN is 16, 12, 10, 8, or 6 RB pairs in sequence;

the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 4 is 4, 3, 2, or 1, the RN performs blind detection 4 times, 3 times, 2 times, or 1 time by 4 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, and the search space size of the RN is 16 or 12 or 8 or 4 RB pairs in sequence;

the number of the R-PDCCH candidate control channels corresponding to the aggregation level L-8 is 2 or 1, and the RN performs blind detection 2 times or 1 time by using 8 RB pairs as a group from the 1 st RB pair of the group of RB pairs, wherein the size of the search space of the RN is 16 or 8 RB pairs.

8. A device for detecting a downlink control channel of a RN (radio network node), comprising:

a monitoring module, configured to monitor the 1 st slot and the 2 nd slot in a group of resource block pairs RB pair;

the control module is used for controlling the monitoring module to monitor the 1 st time slot of a group of resource blocks RB pair firstly and then monitor the 2 nd time slot of the group of RB pair; or, controlling the monitoring module to detect the 1 st slot and the 2 nd slot of the set of RB pair at the same time, where the set of RB pair is configured semi-statically in advance for the RN by the base station eNB through a high layer.

9. The apparatus of claim 8,

further comprising: a detecting module, configured to detect a DL grant and/or a UL grant when the monitoring module monitors the set of RB calls first; the judging module is used for judging whether data transmission exists on the 1 st time slot or not when the detection result of the detecting module is negative;

the control module is further configured to control the monitoring module to stop monitoring the 2 nd time slot if the determination result of the determining module is yes; and under the condition that the judgment result of the judgment module is negative, controlling the monitoring module to continue monitoring the 2 nd time slot.

10. The apparatus of claim 8, wherein the monitoring module is further configured to monitor the resource block RB pair at an aggregation level L by:

the number of the R-PDCCH candidate control channels corresponding to the aggregation level L ═ 1 is 6 or 8, and the monitoring module performs blind detection 6 times or 8 times from the 1 st RB pair of the set of RB pairs by using 1 RB pair as a set, wherein the size of the search space of the monitoring module is 6 or 8 RB pairs;

the number of R-PDCCH candidate control channels corresponding to an aggregation level L ═ 2 is 8, 6, 5, 4, or 3, and the monitoring module performs blind detection 8 times, 6 times, 5 times, 4 times, or 3 times from the 1 st RB pair of the set of RB pairs, with 2 RB pairs as a set, wherein the search space size of the monitoring module is 16, 12, 10, 8, or 6 RB pairs in sequence;

the number of R-PDCCH candidate control channels corresponding to aggregation L ═ 4 is 4, 3, 2, or 1, the monitoring module performs blind detection 4 times, 3 times, 2 times, or 1 time by 4 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, wherein the search space size of the monitoring module is 16 or 12 or 8 or 4 RB pairs in sequence;

the number of the R-PDCCH candidate control channels corresponding to aggregation L ═ 8 is 2 or 1, and the monitoring module performs blind detection 2 times or 1 time by using 8 RB pairs as a group, starting from the 1 st RB pair of the group of RB pairs, wherein the size of the search space of the monitoring module is 16 or 8 RB pairs.