WO2012174913A1

WO2012174913A1 - Method and device for determining search space

Info

Publication number: WO2012174913A1
Application number: PCT/CN2012/073038
Authority: WO
Inventors: 袁明; 毕峰; 梁枫; 杨瑾; 吴栓栓
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-22
Filing date: 2012-03-26
Publication date: 2012-12-27
Also published as: CN102843748A; CN102843748B

Abstract

A method and device for determining search space is disclosed in the embodiments of the present invention, which includes: obtaining the number and the corresponding starting position of the candidate control channel according to the aggregation level, determining the search space corresponding to different aggregation levels; and blind detecting the downlink control channel in the search space corresponding to the different aggregation levels; wherein, when the downlink control channel of the mobile relay is composed by L=16 CCEs, the number of the candidate control channel corresponding to the mobile relay is 1 or 2; when the downlink control channel of the mobile relay is composed by L=32 CCEs, the number of the candidate control channel corresponding to the mobile relay is 1; when the downlink control channel of the mobile relay is composed by Λ=16 Virtual Resource Block (VRB) pairs, the number of the candidate control channel corresponding to the mobile relay is 1 or 2; when the downlink control channel of the mobile relay is composed by Λ=32 VRB pairs, the number of the candidate control channel corresponding to the mobile relay is 1; and, the starting positions of the search space corresponding to different L and Λ are fixed; or are semi-static informed by higher level signaling.

Description

Method and device for determining search space

The present invention relates to mobile communication technologies, and in particular, to a method and apparatus for determining a search space of a downlink control channel of a mobile relay. Background technique

Long Term Evolution (LTE, Long Term Evolution) systems, Advanced Long Term Evolution (LTE-A, LTE-Advanced) systems, and International Mobile Telecommunication Advanced (IMT-Advanced) systems all use orthogonal frequency division multiplexing ( The OFDM system is based on the OFDM system. The OFDM system is a two-dimensional data format. One subframe is composed of two slots. The normal cyclic prefix (Normal CP, Normal Cyclic Prefix) Each slot consists of 7 OFDM symbols. When the cyclic prefix (Extended CP, Extended Cyclic Prefix) is extended, each slot consists of 6 OFDM symbols. The Physical Downlink Control Channel (PDCCH) is located on the first 1 or 2 or 3 or 4 OFDM symbols of the first slot of each subframe.

In the LTE system, the design of the PDCCH is composed of several different components. For convenience of description, several terms are explained below:

RE (Resource Element): The smallest time-frequency resource block occupying 1 subcarrier on 1 OFDM symbol.

REG (Resource Element Group): According to the position of the reference symbol on each OFDM symbol, one REG can be composed of 4 or 6 REs.

Control Information Element (CCE): consists of 36 REs and 9 REGs. The information contained in the CCE is: the downlink scheduling grant information (DL grant) and the uplink scheduling grant information (UL grant) of the user, and System information (SI, System Information), random access (A, Random Access) response, paging (Paging) related information.

Physical Resource Block (PB): One consecutive time slot in the time domain. There are 12 consecutive subcarriers in the frequency domain.

Physical resource block pair (PRB pair): One consecutive subframe in the time domain and 12 consecutive subcarriers in the frequency domain.

Virtual Resource Block (VRB): Logical concept, size and PRB-like. According to the different mapping modes of VRB to PRB, there are two types, namely continuous VRB and discrete VRB. Similarly, the VRB pair and PRB pair are the same size.

Aggregation level L: A combination of CCEs, the PDCCH is composed of L CCEs, and e {1, 2, 4, 8}, that is, the PDCCH can only be composed of a combination of 1 CCEs (represented by 1-CCE), A combination of two CCEs (represented by 2-CCE), a combination of four CCEs (represented by 4-CCE), and a combination of eight CCEs (represented by 8-CCE), and the above four different combinations are respectively corresponding There are four different coding rates, that is, 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.

Search space ( SS , Search Space ): consists of several groups of candidate control channels ( PDCCH candidates ). The user terminal ( UE , User Equipment ) listens to the search space and performs blind detection in the search space to detect the correlation with itself. Downlink control channel. There are two types of search spaces: one is the common search space (UE-common Search Space), that is, the search space that all UEs are listening to, which carries public information related to SI, RA response, and paging; The other is a UE-specific search space, where the bearer is the uplink and downlink scheduling grant information of the UE itself.

PDCCH candidate: Different CCE aggregation levels L correspond to one PDCCH candidate number, that is, the maximum number of blind detections. For example, in the UE's dedicated search space: 1-CCE (L = 1) has 6 PDCCH candidates, that is, the number of blind detections by 1 CCE-group is not more than 6 times; 2-CCE (L = 2) There are 6 PDCCH candidates, that is, the number of blind detections by 2 CCE-groups is not more than 6 times; the number of PDCCH candidates of 4-CCE (L = 4) is 2, that is, the number of blind detections by 4 CCE-groups No more than 2 times; 8-CCE (L = 8) PDCCH candidates are two, that is, the number of blind detections by 8 CCE-groups is not more than 2 times. In the public search space of the UE: 4-CCE has 4 PDCCH candidates, that is, the number of blind detections by 4 CCE-groups No more than 4 times; there are 2 PDCCH candidates for 8-CCE, that is, the number of blind detections by 8 CCE-groups is not more than 2 times.

The starting position of the search space: The starting position of the common search space is always CCEO; the starting position of the UE-specific search space is based on the UE identifier (UE-ID, UE Identity), the total number of CCEs, the L value, the subframe number, and Parameters such as the number of candidate control channels are calculated.

The process of the UE detecting the PDCCH blindly in the LTE system includes:

At the evolved base station end (where the eNB is also referred to as an evolved base station, ie, an evolved universal terrestrial radio access network node (E-UT AN NodeB, where E-UT AN is an abbreviation of Evolved Universal Terrestrial Radio Access Network)), including :

Performing channel coding on the control information of the PDCCH carried by each UE;

The control information of the PDCCH carried by all the encoded UEs is connected in series, and the cell-specific sequence is used for power interference;

The quadrature phase shift keying (QPSK) modulation is performed, and a series of CCEs corresponding to the control information carried by all PDCCHs are obtained, and they are numbered starting from 0; The control channel consists of a total of 32 CCEs, ie their number is CCE

0, CCE 1 CCE 31;

After the above-mentioned series of CCEs are interleaved in units of REGs, they are mapped to REs according to specific mapping rules;

After performing inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform), it is transmitted. On the UE side, including:

Receiving and performing Fast Fourier Transform (FFT), and after deinterleaving, obtaining a series of CCEs having the same number as the eNB end;

The UE performs blind detection from the combination of the 1-CCE. First, the starting position of the 1-CCE is calculated according to parameters such as the UE ID and the subframe number, that is, the blind detection is started from the initial CCE, and then according to the PDCCH candidate. The number determines the specific search space. For example, if the starting position of the 1-CCE is CCE 5, the search space of the UE is {CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE 10}. That is to say, the UE should perform blind detection on [CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE 10] respectively; If the UE does not detect the PDCCH that matches its own UE ID according to the combination of the 1-CCE, the UE performs blind detection from the combination of the 2-CCE. First, the starting position of the 2-CCE is calculated according to parameters such as the UE ID and the subframe number, and the search space is determined according to the number of PDCCH candidates. For example, if the 2-CCE starting position is CCE 10, the search space of the UE is {[CCE 10 CCE 11], [CCE 12 CCE 13] [CCE 20 CCE 21]}. In other words, the UE wants to [CCE

10 CCE 11], [CCE 12 CCE 13] [CCE 20 CCE 21] blind detection. If the UE does not listen to the PDCCH that matches its own UE ID during the entire blind detection process, the UE will discard the PDCCH if it does not have its own downlink control signaling release; The PDCCH that the UE ID matches, the UE will receive or send the corresponding service data according to the indication of the downlink control signaling.

As future wireless communications or cellular systems require increased coverage and support for higher rate transmissions, this presents new challenges for wireless communication technologies. At the same time, the cost of system construction and maintenance is more prominent. As the transmission rate and communication distance increase, the problem of battery energy consumption becomes more prominent, and future wireless communication will adopt higher frequencies, resulting in more serious path loss attenuation. In order to increase the high data rate, group mobility, coverage of temporary network deployment, improve the throughput of the cell edge, and provide services for users within the coverage hole of the cellular system, a relay technology is introduced in the wireless communication system. Therefore, relay technology is regarded as a key technology of 4G.

In a mobile communication system in which a relay node (RN) is introduced, a link between a base station (eNB) and an RN is called a backhaul link (also called Un Link), and the RN is under its coverage. The link between the UEs is called an access link (also called Uu Link), and the link between the eNB and the UE under its coverage is called a direct link. For the eNB, the RN is equivalent to one UE; for the UE, the RN is equivalent to the eNB.

Relay nodes can be divided into two types, namely, in-band relay nodes and out-of-band relay nodes.

For in-band RNs, Un Link and Uu Link use the same frequency band. As shown in Figure 1, both Un Link and Uu Link use the frequency /; In order to avoid the RN's own transmission and reception interference, the transmission and reception operations cannot be performed simultaneously on the same frequency resource. When the RN sends downlink control information to its subordinate UE, it does not receive downlink control information from the eNB. Therefore, during downlink transmission, R first transmits downlink control information to the UEs of the subordinates on the first 1 or 2 OFDM symbols, and then performs handover from transmission to reception within a period of time (such as the gap shown in FIG. 2), and the handover is completed. Then, the data from the eNB is received on the following OFDM symbol, including a downlink physical control channel (R-PDCCH, Relay Physical Downlink Control Channel) and a physical downlink shared channel (PDSCH), as shown in the figure. 2, that is, the R-PDCCH transmitted by the eNB to the R is carried on a physical resource block or a physical resource block pair.

For out-band RNs, Un Link and Uu Link occupy two completely different frequency bands. As shown in Figure 3, Un Link uses frequency /;, Uu Link uses frequency / ₂ . Therefore, out of band

The RN can receive (transmit) on / ₂ while transmitting (receiving) on /; there is no interference between transmission and reception. Therefore, the out-of-band relay node can receive information transmitted by the base station on any one of the OFDM symbols per subframe.

The R-PDCCH may or may not be interleaved during transmission. among them,

The inter-interleaved R-PDCCH (with cross-interleaving) means that the DL grants of all RNs in one subframe are interleaved and then carried on the available resources of the first slot; the UL grant of all RNs in one subframe The inter-interleaving is carried on the available resources of the second time slot, that is, the R-PDCCH carrying multiple RNs in one RB pair.

The non-interleaved R-PDCCH (without cross-interleaving) means that the eNB uses a high-level signaling to configure a set of dedicated VRB pairs for different RNs to be used to carry the R-PDCCH, where the DL grant is in the first The UL grants are transmitted on the available resources of the time slots, and the UL grants are transmitted on the available resources of the second time slot. That is, one VRB pair can only carry the R-PDCCH of the same RN, but cannot be shared by multiple RNs.

The method for determining the search space of the R-PDCCH in the LTE-A system basically extends the method for determining the search space in the above-mentioned UE blind detection process. Among them, the main differences are:

There is no public search space, only a dedicated search space.

Non-interleaved R-PDCCH search space: R-PDCCH consists of one VRB pair, where

Ae {1, 2, 4, 8}, the number of corresponding R-PDCCH candidates is {6, 6, 2, 2}, and the starting position of the search space corresponding to different Λ is VRB0. In the 3GPP discussion, mobile relay (MR, Mobile Relay) is about to become a hot issue. Due to the high-speed movement, a large Doppler frequency offset is generated, and the OFDM system is highly susceptible to frequency offset, that is, a small frequency offset will destroy the orthogonality between subcarriers, which makes it difficult for users to correct. Receive data. In addition, the increase of the Doppler frequency offset also makes the channel coherence time shorter, which leads to rapid changes in the wireless channel, which also seriously affects the correct reception of data. In order to solve the problem of correct reception of the downlink control channel, a new downlink control channel format is likely to be introduced, and the change of the aggregation level L of the R-PDCCH causes the starting position, size, and movement of the R-PDCCH search space. The number of blind inspections has changed.

Thus, the existing method of determining the search space by the UE blind detection process is not applicable to mobile relay. Summary of the invention

In view of this, the main object of the embodiments of the present invention is to provide a method and a device for determining a search space, which can implement a determination of a search space of a downlink control channel of a mobile relay in a high-speed mobile scenario.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

A method of determining a search space, including,

Obtaining the number of candidate control channels and their corresponding starting positions according to the degree of aggregation, and determining a search space corresponding to different degrees of aggregation;

Blindly detecting a downlink control channel in a search space corresponding to different degrees of aggregation;

Wherein, when the downlink control channel of the mobile relay is composed of L=16 CCEs, the number of candidate control channels corresponding to the mobile relay is 1 or 2; when the downlink control channel of the mobile relay is composed of L=32 CCEs The number of candidate control channels is 1; when the downlink control channel of the mobile relay consists of Λ = 16 physical resource blocks for the VRB pair, the number of candidate control channels is 1 or 2 When the downlink control channel of the mobile relay consists of Λ=32 VRB pairs, the number of candidate control channels corresponding to it is 1;

Moreover, the starting positions of the search spaces corresponding to different L and Λ are fixed; or, semi-static notification by high-level signaling.

The values of L and Λ are: 1 or 2 or 4 or 8 or any combination of 16 or 32. For the case of in-band non-interlacing, the starting positions of the search spaces corresponding to the different Λ are the same; or, they are different; or, the parts are the same, and the remaining parts are different;

The starting position is indicated by a VRB index number.

The downlink control channel for the outband mobile relay is composed of L CCEs, and the starting positions of the search spaces corresponding to the different Ls are as follows:

The base station fixes the starting position of the search space of each of the sub-band mobile relays to a specific CCE index number; or, the starting CCE index number is semi-statically variable, and is notified by the high layer signaling The starting CCE index number and the total number of CCEs;

The out-of-band mobile relays perform blind detection in sequence from the respective starting CCE index numbers, and the largest CCE index number in the search space does not exceed the total number of CCEs.

The base station allocates a fixed set of CCEs for each of its subordinate out-of-band mobile relays to carry its downlink control channel;

The out-of-band mobile relays perform blind detection in the respective search space ranges, and the starting positions of the search spaces corresponding to different Ls are the first CCEs in the respective search space ranges;

The set of CCEs are fixed or semi-statically changed and are notified by higher layer signaling.

The base station sets a CCE index number occupied by the downlink control channel of each of the subordinate outbound mobile relays to a fixed value, or is semi-statically variable, and is notified by the high layer signaling;

The search space of each out-of-band mobile relay is the above-mentioned pre-allocated set of CCEs.

When the downlink control channel of the outband mobile relay is composed of one VRB pair, the starting positions of the search spaces corresponding to different Λ are the same; or, they are different; or, the parts are the same, and the remaining parts are different;

The starting position is indicated by a VRB index number.

An apparatus for determining a search space, comprising at least a determining unit and a detecting unit, wherein Determining a unit, obtaining a number of candidate control channels and a corresponding starting position according to the degree of aggregation, and determining a search space corresponding to different degrees of aggregation, where

When the downlink control channel of the mobile relay is composed of L = 16 CCEs, the number of candidate control channels corresponding to the mobile relay is 1 or 2; when the downlink control channel of the mobile relay is composed of L = 32 CCEs, The number of corresponding candidate control channels is 1;

When the downlink control channel of the mobile relay is composed of Λ=16 VB pairs, the number of candidate control channels corresponding to the mobile relay is 1 or 2; when the downlink control channel of the mobile relay is composed of Λ=32 VRB pairs , the number of candidate control channels corresponding to it is 1;

The detecting unit blindly detects the downlink control channel in a search space corresponding to different degrees of aggregation.

The values of L and Λ are: 1 or 2 or 4 or 8 or any combination of 16 or 32.

The starting position of the search space corresponding to the different sums is fixed; or, the high-level signaling is semi-statically notified.

As can be seen from the technical solutions provided by the foregoing embodiments of the present invention, the number of candidate control channels obtained according to the degree of aggregation and their corresponding starting positions is determined, and the search space corresponding to different degrees of aggregation is determined; The downlink control channel is blindly detected in the search space; wherein, when the downlink control channel of the mobile relay is composed of L = 16 CCEs, the number of candidate control channels corresponding thereto is 1 or 2; when the downlink control of the mobile relay When the channel consists of L = 32 CCEs, the number of candidate control channels is 1; when the downlink control channel of the mobile relay consists of Λ = 16 VRB pairs, the corresponding candidate control channels When the downlink control channel of the mobile relay consists of Λ=32 VRB pairs, the number of candidate control channels corresponding to it is 1; and, the search space corresponding to different L and Λ The starting position is fixed; or, semi-static notification by high layer signaling. The solution of the embodiment of the invention solves the problem of how the mobile relay searches for its own downlink control channel in a high-speed mobile scenario. It is well suited for mobile relay (or higher-end terminals), which greatly simplifies the detection complexity of the in-band/out-band relay node for its downlink control channel, and is well suited for relay nodes, saving System overhead increases the transmission efficiency of the system. DRAWINGS

FIG. 1 is a schematic diagram showing the use of the same frequency band for the in-band relay nodes Un Link and Uu Link; 2 is a schematic diagram of an R-PDCCH transmitted by an existing eNB to an RN;

3 is a schematic diagram of a conventional use of different frequency bands for the outband relay nodes UnLink and Uu Link; FIG. 4 is a schematic flowchart of determining a search space according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device for determining a multi-space according to an embodiment of the present invention. detailed description

FIG. 4 is a schematic flowchart of determining a search space according to an embodiment of the present invention. As shown in FIG. 4, the method includes the following steps:

Step 400: Determine the number of candidate control channels and their corresponding starting positions according to the degree of aggregation, and determine a search space corresponding to different degrees of aggregation;

In the case of interleaving, when the downlink control channel of the mobile relay is composed of L = 16 CCEs, the number of candidate control channels corresponding to it is 1 or 2; when the downlink control channel of the mobile relay is L = 32 When CCEs are composed, the number of candidate control channels corresponding to them is 1;

In the case of non-interleaving, when the downlink control channel of the mobile relay consists of Λ=16 VRB pairs, the number of candidate control channels corresponding to it is 1 or 2; when the downlink control channel of the mobile relay is due to Λ = When the 32 VRB pairs are composed, the number of candidate control channels is 1;

Moreover, the starting position of the search space corresponding to the different sums is fixed; or, the high-level signaling is semi-statically notified.

It should be noted that the downlink control channel of the outband mobile relay may be composed of L CCEs or may be composed of one VRB pair, where the value of the sum may be 1 or 2 or 4 or 8 or 16 or 32. random combination. When the degree of aggregation is 1 or 2 or 4 or 8, the method for determining the number of candidate control channels is completely the same as that in the prior art, and details are not described herein again.

Step 401: Blindly detecting a downlink control channel in a search space corresponding to different degrees of aggregation.

In this step, the starting position of the search space corresponding to different sums may be fixed, or may be semi-static notification of high layer signaling. among them,

For the case of in-band non-interlacing, the starting positions of the search spaces corresponding to different Λ may be the same; or different; or some are the same, some are different; the starting position is represented by a VRB index number. For the in-band interleaving, the starting position of the different corresponding search spaces can be referred to the provisions in the existing protocol, and is not used to limit the protection scope of the present invention, and will not be described in detail herein.

The downlink control channel for the outband mobile relay consists of L CCEs. The starting positions of the search spaces corresponding to different Ls are as follows:

The base station fixes the starting position of the search space of each of its subordinate out-of-band mobile relays to a specific one.

The CCE index number is; or, the starting CCE index number is semi-statically variable, and the starting CCE index number and the total number of CCEs are notified by higher layer signaling. In this case, the out-of-band mobile relays perform blind detection in sequence from the respective starting CCE index numbers, and the largest CCE index number in the search space cannot exceed the total number of CCEs; or

The base station allocates a fixed set of CCEs for each of its subordinate out-of-band mobile relays to carry its downlink control channel. At this time, the range of the search space is limited to the set of fixed CCEs, and each out-of-band mobile relay performs blind detection within the respective search space, and the starting positions of the search spaces corresponding to different Ls are each Search for the first CCE in the spatial range. The set of CCEs may be fixed or semi-statically changed and notified by higher layer signaling; or

The base station sets a set of CCE index numbers occupied by the downlink control channels of each of the subordinate outbound mobile relays to a fixed value, or is semi-statically variable, and is notified by higher layer signaling. At this time, the search space of each out-of-band mobile relay is the above-mentioned pre-allocated set of CCEs, and blind detection is not required.

When the downlink control channel of the outband mobile relay is composed of one VRB pair, the starting position of the search space corresponding to different Λ is completely the same as the method of determining the in-band non-interlacing, and will not be described in detail here.

The method of the embodiment of the invention greatly simplifies the detection complexity of the inband/outband relay node for its downlink control channel, and is well applied to the relay node, which saves system overhead and improves the transmission efficiency of the system.

For the method of the embodiment of the present invention, an apparatus for determining a search space, where at least a determining unit and a detecting unit are included, where

Determining a unit, obtaining a number of candidate control channels and a corresponding starting position according to the degree of aggregation, and determining a search space corresponding to the different degrees of polymerization, where

When the downlink control channel of the mobile relay is composed of Λ=16 VRB pairs, the number of candidate control channels corresponding to the mobile relay is 1 or 2; when the downlink control channel of the mobile relay is composed of Λ=32 VRB pairs , the number of candidate control channels corresponding to it is 1;

The method of the present invention will be described in detail below with reference to specific embodiments.

In a first specific embodiment, the in-band non-interlace, that is, the case where the start positions of the search spaces are the same. In this embodiment, it is assumed that the mobile relay belongs to the in-band relay, and the -PDCCH of each mobile relay covered by the same base station is non-interleaved. The base station uses the high-level signaling to pre-semi-statically configure 40 VRB pairs for the mobile relay to carry the R-PDCCH, which are numbered VRB0 and V B1 VRB39 respectively. These 40 VRB pairs are logically contiguous, but may be contiguous or discrete depending on the way V B to PRB is mapped.

The determination of each mobile relay search space includes:

If the value of the base station configuration { is {1, 2, 4, 8, 16, 32}, the number of corresponding R-PDCCH candidates is {6 or 8 or 10, 6 or 8 or 10, 2 or 3 respectively. Or 4, 2 or 3 or 4, 1 or 2, 1 }.

The starting positions of the search spaces corresponding to different Λ are the same. For example, in this embodiment, the starting position of the search space corresponding to all Λ is assumed to be VRB0;

The specific blind inspection process is as follows:

The mobile relay starts from Λ = 1, and starts from VRB0 according to the 1-VRB-group. The corresponding R-PDCCH candidate is 6 or 8 or 10, that is, 6 or 8 or 10 times.

The search space is: { VRBO, V B1 , V B5 }, or { VRBO, V B1 , V B7 }, or { VRBO, V B1 , V B9 }; The corresponding search space sizes are: 6 or 8 or 10 VRB.

If the mobile relay does not detect the R-PDCCH that matches its own ID, it continues to detect from the 2-VRB-group starting from Λ = 2, and the corresponding R-PDCCH candidate is 6 or 8 or 10, that is, a total of Detected 6 or 8 or 10 times;

The search space is: { {V BO, V B1}, {V B2, V B3 } {V B10, V B11}}, or {{VRBO, V B1}, {V B2, V B3} ···, { V B14, V B15}}, or {{VRB0, V B1}, {V B2, V B3} {V B18, V B19}}; the corresponding search space sizes are: 12 or 16 or 20 VRBs.

If the mobile relay does not detect the R-PDCCH that matches its own ID, it continues to detect from the 4-VRB-group starting from Λ=4, and the corresponding R-PDCCH candidate is 2 or 3 or 4, that is, the common detection 2 or 3 or 4 times;

The search space is: { {VRBO, V B1, V B2, V B3 }, {V B4, V B5, V B6, V B7}}, or {{VRBO, V B1, V B2, V B3 }, {V B4, V B5, V B6, V B7}, {V B8, V B9, V B10, VRB11 }}, or {{VRBO, V B1, V B2, V B3 }, {V B4, V B5, V B6 , V B7}, {V B8, V B9, V B10, V B11}, {V B12, V B13, V B14, V B15}}; The corresponding search space sizes are: 8 or 12 or 16 VRBs.

If the mobile relay still does not detect the R-PDCCH that matches its own ID, it continues to detect from the 8-VRB-group starting from Λ = 8, and the corresponding R-PDCCH candidate is 2 or 3 or 4, that is, a total of Detected 2 or 3 or 4 times;

The search space is: { {VRBO, V B1, ···, V B7}, {V B8, V B9, ···, V B15}}, or {{VRBO, V B1, ···, V B7} , {V B8, V B9, ···, V B15}, {V B16, V B17, ···, V B23}}, or {{VRBO, V B1, ···, V B7}, {V B8, V B9, ···, V B15}, {V B16, V B17, ···, V B23 }, {V B24, V B25, ···, V B31}}; corresponding search space size For: 16 or 24 or 32 VRBs.

If the MR still does not detect the R-PDCCH that matches its own ID, it continues to detect from the 16-VRB-group starting from Λ = 16, and the corresponding R-PDCCH candidate is 1 or 2, that is, a total of 1 or 2 is detected. Times

The search space is: {VRBO, VRB1, ···, VRB15}, or {{VRBO, VRB1, ···, VRB15},

{V B16, V B17, V B31}}; The search space size is 16 or 32 VRBs.

If the mobile relay still does not detect the R-PDCCH matching its own ID, continue from Λ = 32 Start to perform detection according to the 32-VRB-group, and the corresponding R-PDCCH candidate is one, that is, one total detection;

The search space is: {VRBO, V B1, V B31}; The search space size is 32 VRBs. In the detection process of any of the above VRB combinations, the mobile relay stops detecting once it detects the R-PDCCH matching its own ID.

In a second embodiment, the in-band non-interlacing, that is, the case where the starting positions of the respective search spaces are different. In this embodiment, if the value of the base station configuration Λ is {4, 8, 16, 32}, the number of corresponding R-PDCCH candidates is {2, 2, 1, 1}. The starting position of the search space corresponding to different Λ is different. For example, the starting position of the search space corresponding to Λ = 4 is VRB28; the starting position of the search space corresponding to Λ = 8 is V B24; Λ = The starting position of the search space corresponding to 16 is VRB16; the starting position of the search space corresponding to Λ = 32 is VRB0;

The specific blind inspection process is as follows:

The mobile relay starts from Λ = 4 and is detected by the 4-VRB-group. The corresponding R-PDCCH candidate is 2, that is, 2 times in total;

The search space is: { {V B28, V B29, V B30, V B31 }, {V B32, V B33,

V B34 , V B35}}; The corresponding search space is large ' j, respectively 8 VRBs.

If the mobile relay does not detect the R-PDCCH that matches its own ID, it continues to detect from the 8-VRB-group starting from Λ = 8, and the corresponding R-PDCCH candidate is 2, that is, 2 times in total; The space is: { {V B24, V B25, ···, V B31 }, {V B32, V B33, ···, V B39}}; The corresponding search space size is 16 VRBs.

If the mobile relay still does not detect the R-PDCCH that matches its own ID, it continues to detect from the 16-VRB-group starting from Λ=16, and the corresponding R-PDCCH candidate is one, that is, one total detection;

The search space is: {VRB16, V B17, V B31}; The search space size is 16 VRBs. If the mobile relay still does not detect the R-PDCCH that matches its own ID, it continues to detect from the 32-VRB-group starting from Λ=32, and the corresponding R-PDCCH candidate is one, that is, one total detection; The search space is: {VRBO, V B1, V B31}; The search space size is 32 VRBs. In the detection process of any of the above VRB combinations, the mobile relay stops detecting once it detects the R-PDCCH that matches its own ID.

A third embodiment, in-band interleaving. In this embodiment, the 4g mobile relay belongs to the inband relay, and the R-PDCCHs of the respective mobile relays covered by the same base station are interlaced. At this time, the determination of the search space is basically the same as the determination method of the search space of the UE in the current LTE/LTE-A. The difference is that the number of R-PDCCH candidates corresponding to L=16 is 1 or 2. When L=32, the number of corresponding R-PDCCH candidates is 1.

In a fourth specific embodiment, the outband is not interleaved, and the downlink control channel of the mobile relay is composed of L CCEs. In this embodiment, the mobile relay belongs to the outband relay, and the downlink control channels of the four mobile relays covered by the same base station are non-interlaced and composed of L CCEs, and _£ {4, 8, 16, 32 }. At this time, the downlink control channel of the mobile relay is carried on the first several OFDM symbols of the first slot of each subframe.

In this embodiment, it is assumed that the base station fixes the starting position of the search space of its four subordinate MRs to a specific CCE index number, and the CCE index number may also be semi-statically variable, that is:

For example, the starting positions of the search spaces of MR1, MR2, MR3, and MR4 are CCE0 and CCE16, respectively.

CCE20 and CCE55. At this time, each MR needs to start blind detection from the respective starting CCE index numbers, and the search space cannot exceed the total number of CCEs.

In this embodiment, it is assumed that the total number of CCEs is 80, and each MR is notified by higher layer signaling.

Take the blind detection process of MR 1 as an example, including:

M 1 starts from L = 4, and starts from CCE0 according to the 4-CCE-group. The corresponding candidate control channel is 2 or 3 or 4, that is, 2 or 3 or 4 times;

The corresponding search space is: { {CCEO, CCE1, CCE2, CCE3}, {CCE4, CCE5, CCE6, CCE7}}, or {{CCEO, CCE1, CCE2, CCE3 }, {CCE4, CCE5, CCE6, CCE7}, { CCE8, CCE9, CCE10, CCE11}}, or {{CCEO, CCE1, CCE2, CCE3}, {CCE4, CCE5, CCE6, CCE7}, {CCE8, CCE9, CCE10, CCE11}, {CCE12, CCE13, CCE14, CCE15 }}; The search space size is: 8 or 12 or 16 CCEs.

If MR1 does not detect a downlink control channel that matches its own ID, continue from L = 8 Start to detect by 8-CCE-group, the corresponding candidate control channel is 2 or 3 or 4, that is, 2 or 3 or 4 times of total detection;

The corresponding search space is: {{CCE0, CCE1,...,CCE7}, {CCE8, CCE9, ···, CCE15}}, i^{{CCE0,CCEl, ...,CCE7}, {CCE8,CCE9 , ..., CCE15}, {CCE16, CCE17, ···, CCE23}}, i^{{CCE0,CCEl, ...,CCE7}, {CCE8, CCE9, ···, CCE15}, {CCE16 , CCE17, ···, CCE23 }, {CCE24, CCE25, ···, CCE31}}; The search space size is: 16 or 24 or 32 CCEs.

If MR1 does not detect the downlink control channel that matches its own ID, it continues to detect from 16-CCE-group starting from L=16, and the corresponding candidate control channel is 1 or 2, that is, 1 or 2 times in total;

The corresponding search space is: { {CCEO, CCE1, ···, CCE15}}, or {{CCEO, CCE1, ···, CCE15}, {CCE16, CCE17, ···, CCE31}}; : 16 or 32 CCEs.

If MR1 does not detect the downlink control channel that matches its own ID, it continues to detect from 32-CCE-group starting from L=32, and the corresponding candidate control channel is one, that is, one total detection; the corresponding search space is : { {CCEO, CCE1, CCE31}}; The search space size is: 32 CCEs.

In the detection process of any of the above CCE combinations, the MR detects the R-PDCCH matching its own ID and stops the blind detection.

Taking the blind detection of MR4 as an example, the process is as follows:

M 4 starts from L = 4 and starts to detect from the CCE20 according to the 4-CCE-group. The corresponding candidate control channel is 2 or 3 or 4, that is, 2 or 3 or 4 times;

The corresponding search space is: { {CCE55, CCE56, CCE57, CCE58}, {CCE59, CCE60, CCE61, CCE62}}, or {{CCE55, CCE56, CCE57, CCE58}, {CCE59, CCE60, CCE61, CCE62}, { CCE63, CCE64, CCE65, CCE66}}, or {{CCE55, CCE56, CCE57, CCE58}, {CCE59, CCE60, CCE61, CCE62}, {CCE63, CCE64, CCE65, CCE66}, {CCE67, CCE68, CCE69, CCE70 }}; The search space size is: 8 or 12 or 16 CCEs. If MR4 does not detect the downlink control channel that matches its own ID, it continues to detect from 8-CEE-group starting from L=8, and the corresponding candidate control channel is 2 or 3, that is, 2 or 3 times. Note: When the candidate control channel is 4, the search space will exceed the total number of CCEs. Therefore, in this case, the candidate control channel can only be 2 or 3.

The corresponding search space is: { {CCE55, CCE56, ···, CCE62}, {CCE63, CCE64, ···,

CCE70}}, or {{CCE55, CCE56, ···, CCE62}, {CCE63, CCE64, ···, CCE70}, {CCE71, CCE72, CCE78}}; The search space size is: 16 or 24 CCE.

If the MR4 does not detect the downlink control channel that matches its own ID, it continues to detect from the 16-CCE-group starting from L = 16, and the corresponding candidate control channel is 1 or 2, that is, 1 or 2 times. Note: When the candidate control channel is 2, the search space will exceed the total number of CCEs. Therefore, in this case, the candidate control channel can only be one.

The corresponding search space is: {CCE55, CCE56, CCE70}; The search space size is: 16 CCE.

Since the total number of CCEs is 80, MR4 does not detect Λ = 32, ie 检测 = 16 is detected and stops.

In the detection process of any of the above CCE combinations, MR detects the downlink control channel matching its own ID and stops the blind detection.

In this embodiment, it is assumed that the base station configures a set of fixed CCEs for its subordinate 4 MRs to carry their respective downlink control channels, and the range of the search space is limited to the above-mentioned group of CCEs. E.g:

1) The search space range of M 1 is limited to {CCEO, CCE1, CCE15}; the search space range of MR2 is limited to {CCE20, VCCE21, CCE51}; the search space range of MR3 is limited to { CCE55 , CCE56 , In CCE62 }; the search space range of MR4 is limited to {CCE65, CCE66, ···, CCE80}.

2) The starting positions of the search spaces corresponding to different Ls are the same, and the starting positions of the search spaces corresponding to each L are the first CCEs in the respective search space ranges. For MR1, the starting position of the search space corresponding to each L is CCE0; for MR2, the starting bit of the search space corresponding to each L is For the MR3, the starting position of the search space corresponding to each L is CCE55; for M3, the starting position of the search space corresponding to each L is CCE65.

Taking the blind detection of MR 1 as an example, the process is as follows:

The corresponding search space is: { {CCEO, CCEl, CCE2, CCE3}, {CCE4, CCE5, CCE6, CCE7}}, or {{CCEO, CCEl, CCE2, CCE3 }, {CCE4, CCE5, CCE6, CCE7}, { CCE8, CCE9, CCE10, CCE11}}, or {{CCEO, CCEl, CCE2, CCE3}, {CCE4, CCE5, CCE6, CCE7}, {CCE8, CCE9, CCE10, CCE11}, {CCE12, CCE13, CCE14, CCEl 5}}; The search space size is: 8 or 12 or 16 CCEs.

If MR1 does not detect the downlink control channel that matches its own ID, it continues to detect from 8-CCE-group starting from L=8, and the corresponding candidate control channel is two, that is, two times. Note: When the candidate control channel is 3 or 4, the search space will exceed the pre-allocated range of the base station. Therefore, in this case, the candidate control channel can only be 2.

The corresponding search space is: {{CCE0, CCE1,•••, CCE7}, {CCE8, CCE9, ···, CCE15 }}; The search space size is 16 CCEs.

If MR1 does not detect the downlink control channel that matches its own ID, it continues to detect from 16-CCE-group starting from L=16, and the corresponding candidate control channel is 1 or 2, that is, 1 or 2 times. Note: When the candidate control channel is 2, the search space will exceed the pre-allocated range of the base station. Therefore, in this case, the candidate control channel can only be 1.

The corresponding search space is: { {CCEO, CCEl, CCE15}}; The search space size is: 16 CCEs.

Since the range of MR1 search space is limited to CCE0 CCE15, MR1 does not detect Λ = 32, that is, Λ = 16 is detected and stops.

In the detection process of any of the above CCE combinations, the MR detects the downlink control channel matching its own ID and stops the blind detection.

Similarly, the search space of MR2, M3 and MR4 is determined as the MR1, as long as it does not exceed the base. The range of pre-allocated search spaces is sufficient.

In this embodiment, it is assumed that the base station sets the CCE index number occupied by the downlink control channels of the four MRs of the subordinate to a fixed value or a semi-static variable, and performs notification by using high layer signaling.

For example, the downlink control channel of MR1 is composed of 16 CCEs, and the occupied CCE index number is fixed to { CCEO ~ CCE15 }; the downlink control channel of M 2 is composed of 32 CCEs, and the occupied CCE cable | is fixed to { CCE20 CCE51 } The downlink control channel of M 3 is composed of 4 CCEs, and the occupied CCE index number is fixed to { CCE16 ~ CCE19 }; the downlink control channel of MR4 is composed of 8 CCEs, and the occupied CCE index number is fixed to { CCE56 ~ CCE63 }. Note: When the base station assigns a CCE index number to each of its subordinate MRs, it must ensure that the CCE index numbers of the respective MRs do not overlap.

At this time, the MR does not need to perform blind detection, and as long as the allocated group of CCEs is received and demodulated, its own downlink control information can be obtained.

In addition, the CCE index number occupied by the downlink control channel of each MR may be a fixed value or a semi-statically changed value, and the updated value of each MR needs to be notified by using high layer signaling.

In a fifth specific embodiment, the outband is not interleaved, and the downlink control channel of the mobile relay is composed of one VRB. The same as the first embodiment and the second embodiment, the only difference is that the definitions of the out-of-band and in-band VRB pair are different. Size of the out-of-band VRB pair: It occupies 12 REs in the frequency domain and occupies all OFDM symbols of the entire subframe in the time domain. The size of the in-band VRB pair: still occupies 12 Es in the frequency domain, but is removed in the time domain - max (the base station is the OFDM symbol occupied by the PDCCH transmitted by the macro cell UE, and the inband relay is its subordinate The OFDM symbol occupied by the PDCCH transmitted by the UE).

Sixth embodiment, out-of-band interleaving. In this embodiment, the MR belongs to the outband relay, and the downlink control channels of the MRs covered by the same base station are interlaced. At this time, the determination of the search space is basically the same as the method for determining the search space of the UE in the current LTE/LTE-A; the difference is that the number of candidate control channels corresponding to L=16 is 1 or 2, L=32. The number of corresponding candidate control channels is 1.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in Within the scope of protection of the present invention.

Claims

Claim

A method for determining a search space, characterized in that

2. Method according to claim 1, characterized in that the values of the sum and Λ are: 1 or 2 or 4 or 8 or any combination of 16 or 32.

The method according to claim 1, wherein, in the case of in-band non-interlacing, the starting positions of the search spaces corresponding to the different frames are the same; or, different; or, the parts are the same , the rest are different;

The starting position is indicated by a VRB index number.

The method according to claim 1, wherein the downlink control channel for the out-of-band mobile relay is composed of L CCEs, and the starting positions of the search spaces corresponding to the different Ls are as follows:

5. The method according to claim 1, wherein the downlink control for the out-of-band mobile relay The system is composed of L CCEs, and the starting positions of the search spaces corresponding to the different Ls are as follows: The base station allocates a fixed set of CCEs for its subordinate mobile relays to carry its downlink control channel;

The method according to claim 1, wherein when the downlink control channel of the outband mobile relay is composed of one VRB pair, the starting positions of the search spaces corresponding to different Λ are the same; or Different; or, the parts are the same and the rest are different;

The starting position is indicated by a VRB index number.

A device for determining a search space, comprising: at least a determining unit and a detecting unit, wherein

9. The device according to claim 8, wherein the values of the sum are: 1 Or any combination of 2 or 4 or 8 or 16 or 32.

10. Apparatus according to claim 8 or claim 9, wherein the starting positions of the search spaces corresponding to different sums are fixed; or, the high level signaling is semi-statically notified.