WO2012022195A1 - 一种检测中继物理下行控制信道的方法及系统 - Google Patents
一种检测中继物理下行控制信道的方法及系统 Download PDFInfo
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- WO2012022195A1 WO2012022195A1 PCT/CN2011/076142 CN2011076142W WO2012022195A1 WO 2012022195 A1 WO2012022195 A1 WO 2012022195A1 CN 2011076142 W CN2011076142 W CN 2011076142W WO 2012022195 A1 WO2012022195 A1 WO 2012022195A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to a method for determining a relay node downlink control channel (R-PDCCH, Relay Physical Downlink Control Channel), and more particularly to a method and system for detecting a downlink control channel of a relay node capable of determining an R-PDCCH allocation mode and a bearer mode.
- R-PDCCH Relay Physical Downlink Control Channel
- OFDM Orthogonal Frequency Division Multiplexing
- the data is in a time-frequency two-dimensional format, and one subframe is composed of two slots. If a normal cyclic prefix (CP, Cyclic Prefix) is used, each slot is composed of 7 OFDM symbols. If the extended CP is used, each slot consists of 6 OFDM symbols.
- the information transmitted by the PDCCH is composed of downlink 4 authorized information (DL grant ) and uplink 4 authorized information (UL grant ).
- Resource element The smallest time-frequency resource block occupying 1 subcarrier on 1 OFDM symbol.
- 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 by 36 RE, 9
- the composition of the REG, the information contained in the CCE has the user's DL grant and UL grant.
- Physical Resource Block occupies 1 consecutive time slots in the time domain, and occupies 12 consecutive subcarriers in the frequency domain.
- Physical resource block pair occupies 1 consecutive subframes in the time domain, and occupies 12 consecutive subcarriers in the frequency domain.
- VRB Virtual Resource Block It is a logical concept, size and PRB. According to the different mapping modes from VRB to PRB, there are two types, namely continuous VRB and discrete VRB. Similarly, the VRB pair and the PRB pair are the same, and they are the same.
- mapping process of the PDCCH is briefly described as follows:
- the mapping of the PDCCH by the base station specifically includes:
- the PDCCH (including the DL grant and the UL grant) of all the users (UE, User Equipment) of the subordinates are independently coded, that is, each UE's PDCCH can use different coding rates.
- QPSK modulation is performed on the above-mentioned string of CCEs.
- the above symbols are interleaved in units of REG, and mapped to the first 1 or 2 or 3 or 4 OFDM symbols according to the first time domain and the latter frequency domain.
- the UE demodulates the PDCCH by using Cell Specific Reference Signals (CRS), and performs blind detection on the CCE, and finally obtains respective PDCCHs.
- CRS Cell Specific Reference Signals
- relay technology is introduced in the wireless communication system. Therefore, relay technology is regarded as a key technology of the fourth generation (4G, 4th Generation).
- FIG. 1 is a schematic diagram of a system architecture including an RN according to the related art.
- a link between an eNB and a relay node (RN) in a mobile communication system is called a relay link (Backhaul Link).
- Backhaul Link also known as the backhaul link
- the link between the RN and the user under its coverage is called the Access Link
- the link between the eNB and the UE under its coverage is called the direct link.
- Direct Link Clean For the eNB, the RN is equivalent to one UE; for the UE, the RN is equivalent to the eNB.
- FIG. 2 is a schematic diagram of a frame structure according to the related art. As shown in FIG. 2, on a downlink backhaul subframe (ie, a subframe in which an eNB transmits data to an RN), the RN first transmits on the first 1 or 2 OFDM symbols.
- R-PDCCH relay node downlink control channel
- R-PDSCH Relay Physical Downlink Shared Channel
- the R-PDCCH sent by the eNB to the RN is carried on a physical resource block or a physical resource block pair, and includes information such as an uplink/downlink scheduling authorization of the RN.
- FIG. 3 is a schematic diagram of the relationship between the R-PDCCH and the PDCCH according to the related art. As shown in FIG. 3, on the downlink backhaul subframe, the eNB semi-statically reserves a number of VRB pairs for R-PDCCH transmission. Where PDCCH is in the first The first n (n ⁇ 3) symbols of the slot are transmitted, and the DL grant is transmitted on the remaining symbols of the first slot except the PDCCH, and the UL grant is transmitted on the second slot.
- the interleaving of R-PDCCH at the 3GPP, The 3rd Generation Partnership Project (3GPP) conference has been the focus of discussion. The conclusion is:
- the eNB semi-statically reserves several VRB pairs for the transmission of the R-PDCCH. After all the frame and a DL grant RN is interwoven carried on the first slot of the VRB pair above; all in one sub-RN 1 Zhen UL grant after weaving contained in each of two of the VRB pair of On the time slot.
- the RN detects its control information on the first slot and the second slot of the VRB pair, respectively.
- the main object of the present invention is to provide a method and system for detecting a downlink control channel of a relay node, which can ensure correct detection of the R-PDCCH by the relay node and reduce the complexity of detecting the downlink control channel.
- a method for detecting a downlink control channel of a relay node includes:
- the network side divides the available resources of the R-PDCCH into subsets, and assigns at least one of the subsets to the RN;
- the RN determines its own R-PDCCH in the assigned subset.
- assigning at least one of the subsets to the RN is specifically:
- the network side divides the available resources of the R-PDCCH into subsets, which are specifically:
- the channel bandwidth is used to determine the corresponding subset partitioning pattern for each channel bandwidth.
- the total number of VRBs or VRB pairs is determined by the total number of VRBs or VRB pairs.
- the total number of reserved VRBs or VRB pairs corresponds to a subset partitioning mode, or the total number of reserved VRBs or VRB pairs corresponds to each. Divided into two or more subsets;
- the channel bandwidth is used to determine the total number of subsets corresponding to each channel bandwidth. Specifically, each channel bandwidth corresponds to a subset partitioning manner, or each channel bandwidth corresponds to more than two subset partitioning modes.
- the method further includes: the network side not notifying the subset to which the RN belongs;
- the determining, by the RN, the R-PDCCH in the allocated subset is: the RN determines the subset division manner according to the total number of VRBs or VRB pairs carrying the R-PDCCH or the channel bandwidth, and performs blind detection on the determined subsets in turn, Until the R-PDCCH is determined, or when the subset division mode cannot be determined, the subsets corresponding to all the subset division modes are blindly detected until the R-PDCCH of the self is determined.
- the method further includes: the network side implicitly notifying the RN to carry the R-PDCCH
- the RN determines its own R-PDCCH in the allocated subset as follows: The RN performs blind detection on the subset of the implicit notifications in sequence until it determines its own R-PDCCH.
- the implicit notification is that the subset index number of the R-PDCCH of the RN is uniquely determined by the total number of RN IDs or subsets or the total number of reserved VRBs or VRB pairs or the above three parameters. Any combination is determined together.
- the RN determines its own R-PDCCH in the allocated subset as follows: The RN detects its own R-PDCCH in the subset.
- the method further includes:
- the RN When the RN initially accesses, the RN is used to notify the RN to carry the VRB or VRB pair index information of the R-PDCCH;
- the method further includes:
- the PRB index information carrying the downlink grant information and/or the uplink grant information is notified to the RN.
- the network side divides the available resources of the R-PDCCH into a subset, and allocates at least one of the subsets to the RN, specifically:
- the RN determines its own R-PDCCH in the allocated subset as follows:
- the RN determines a fixed or semi-static fixed subset carrying its own R-PDCCH and detects its own R-PDCCH in the determined subset.
- the method further includes:
- the total number and size of fixed or semi-static fixed downlink grant information and/or uplink grant information, and the VRB or VRB pair index number carrying downlink grant information and/or uplink grant information are the total number and size of fixed or semi-static fixed downlink grant information and/or uplink grant information, and the VRB or VRB pair index number carrying downlink grant information and/or uplink grant information.
- a system for detecting a downlink control channel of a relay node is applied to a communication network including an RN, where the system includes a dividing unit, an allocating unit, and a determining unit, where the dividing unit and the allocating unit are disposed on a network side, The determining unit is set in the RN; wherein
- a dividing unit configured to divide the R-PDCCH available resources of the network side into a subset
- an allocating unit configured to allocate at least one of the subsets to the RN
- a determining unit configured to determine an R-PDCCH of the RN in the allocated subset.
- the allocating unit further allocates only one subset to the RN or all subsets to the RN.
- the dividing unit further determines a subset partitioning manner by using a total number of VRBs or VRB pairs reserved by the network for carrying the R-PDCCH; or determining a corresponding sub-band of each channel bandwidth by using the channel bandwidth.
- the total number of reserved VRBs or VRB pairs corresponds to a subset partitioning mode, or the total number of reserved VRBs or VRB pairs. It should be divided into two or more subsets; or, each channel bandwidth corresponds to one subset division mode, or each channel bandwidth corresponds to two or more subset division modes.
- the system further includes: a notification unit, configured on the network side, for not notifying the RN of the subset to which the RN belongs;
- the determining unit further determines a subset partitioning manner according to the reserved total number of VRBs or VRB pairs or channel bandwidth, and performs blind detection on the determined subsets until the R-PDCCH of the RN is determined; or When the subset division mode cannot be determined, all subsets corresponding to the subset division manner are blindly detected until the R-PDCCH of the self is determined.
- the system further includes: a notification unit, configured on the network side, to implicitly notify the R-PDCCH subset of the RN bearer;
- the determining unit performs blind detection on the subset of implicit notifications in turn until it determines its own R-PDCCH.
- the implicit notification is that the subset index number of the R-PDCCH of the RN is uniquely determined by the total number of RN IDs or subsets or the total number of reserved VRBs or VRB pairs or the above three parameters. Any combination is determined together.
- the determining unit further detects the R-PDCCH of the RN in the notified subset.
- the system further comprises:
- the VRB or VRB pair index information notification unit is configured to notify the RN to carry the VRB or VRB pair index information of the R-PDCCH by using the PDCCH when the RN initially accesses, or notify the RN to carry the R-PDCCH VRB or VRB by using the high layer signaling. Pair index information.
- the dividing unit further fixes or semi-statically fixed the total number and size of the subset; the allocating unit further fixes or semi-statically fixes an index number of the R-PDCCH subset of the bearer RN;
- the determining unit further determines a fixed or semi-static of the R-PDCCH carrying the RN
- the subset is fixed, and its own R-PDCCH is detected in the determined subset.
- the division manner of the subset is determined according to the VRB or VRB pair available to the current R-PDCCH, and then the divided subset is allocated to the RN, wherein all the subsets may be allocated to the RN, or one of them may be
- the subset is assigned to the RN, and some of the subsets can also be assigned to the RN.
- the subset allocated to each RN may be explicitly or implicitly notified to the RN, so that the RN can perform its own R-PDCCH detection according to the subset information.
- the invention is based on the above idea, and realizes fast detection of the R-PDCCH by the RN while saving network resources as much as possible.
- the invention can be well applied to the communication network including the relay node, ensures the correct detection of the R-PDCCH by the relay node, and reduces the complexity of the blind detection downlink control channel to a certain extent, and improves the whole system. Processing efficiency.
- FIG. 1 is a schematic diagram of a system architecture including an RN according to the related art
- FIG. 2 is a schematic diagram of a frame structure according to the related art
- FIG. 3 is a schematic diagram of a relationship between an R-PDCCH and a PDCCH according to the related art
- FIG. 4 is a schematic structural diagram of a system for detecting a downlink control channel of a relay node according to the present invention. detailed description
- the basic idea of the present invention is to determine the division manner of the subset according to the VRB or VRB pair available to the current R-PDCCH, and then allocate the divided subset to the RN, where all the subsets can be allocated to the RN, or One of the subsets is assigned to the RN, and some of the subsets can also be assigned to the RN.
- the subset allocated to each RN may be explicitly or implicitly notified to the RN, so that the RN can perform its own R-PDCCH detection according to the subset information.
- Embodiment 1 the reserved N VRBs or VRB pairs for carrying the R-PDCCH are uniquely corresponding to the division manner of the subset; wherein the number of subsets that can be divided is set to m. It is described in detail below.
- the base station divides the N VRBs or VRB pairs that are semi-statically reserved for carrying the R-PDCCH into m subsets, and the m value and the size of the m subsets are uniquely determined by the N value.
- the specific determination manner is as shown in Table 1, where the VRB or VRB pair included in each subset is continuous, but the mapping of the VRB or VRB pair to the PRB or PRB pair may be continuous or discrete, but The division method is unique, and the specific division method is shown in Table 1.
- the maximum number of subsets in Table 1 is five. It is also possible to set more than 5 subsets as needed. In Table 1, when there are multiple subsets, the VRB or VRB pair allocated in each subset is as equal as possible.
- N the number of reserved VRBs or VRB pairs is N.
- the eNB semi-statically allocates 10 VRBs or VRB pairs for the R-PDCCH
- the size of the subset is 10, and the RN can perform blind detection in the 10 VRBs or VRB pairs until the blind detection itself. Until the R-PDCCH.
- the case of multiple subsets is also included.
- N 8
- the maximum number of subsets in Table 1 is five. You can also set more than 5 subsets as needed.
- the VRB or VRB pair allocated in each subset is as equal as possible. Specifically, for the case where the reserved total number of the R-PDCCH VRBs or the VRB pair is greater than 20, the division is performed according to the foregoing subset division principle.
- the RN may first perform blind detection on the subset 1 and if the corresponding R-PDCCH is not detected, continue to perform the subset 2 Blind detection, if not, continue to blindly check the subset 3 until the corresponding R-PDCCH is blindly detected.
- the reserved N VRBs or VRB pairs for carrying the R-PDCCH uniquely correspond to the partitioning manner of the subset; wherein the number of subsets that can be divided is set to m.
- the m value is determined in exactly the same manner as in the first embodiment.
- the base station not only informs the RN of all the subdivision modes, but also implicitly informs each of the RNs of their respective subset index numbers.
- the RN learns all the subsets according to the N value and the table 1 notified by the network side.
- the R bears the own bearer according to the implicit relationship between the parameters such as the total number of subsets and the relay node identifier (RN-ID).
- RN-ID relay node identifier
- the subset index where the PDCCH is located. As an implementation, it can The subset index of the R-PDCCH carrying the RN is determined by: subset index RN-ID mod N subset , where the RN-ID is the temporary network identifier of the RN, and N subset is the total number N of the subset.
- the RN does not need to blindly detect m subsets or specific subsets as in the first embodiment, but only in the subset corresponding to the subset index to which it belongs.
- the blind detection of the R-PDCCH can greatly reduce the number of blind detections.
- the reserved N VRBs or VRB pairs for carrying the R-PDCCH uniquely correspond to the division manner of the subset; wherein the number of subsets that can be divided is set to 111.
- the specific treatment is as follows:
- the base station limits the m value to ⁇ 1, 2, 3, 4 ⁇ , that is, the same N value corresponds to 4 different m values.
- the indication bit carried in the R-PBCH is 10
- it represents m 3, that is, divided into 3 subsets, and each subset has 5 PRB pairs;
- the RN If the RN receives the indication bit carried in the R-PBCH as 10, the RN knows all the subsets, that is, the total number of subsets is 3, and each subset has 5 PRB pairs 0. Further, the RN blinds the three subsets separately. Detect until it detects its own R-PDCCH.
- the reserved N VRBs or VRB pairs for carrying the R-PDCCH uniquely correspond to the division manner of the subset; wherein the number of subsets that can be divided is set to 111.
- the specific treatment is as follows:
- the base station implicitly informs each RN of its division in addition to the RN subset division method through R-PBCH.
- the reserved N VRBs or VRB pairs and sub-carriers for carrying the R-PDCCH The division method of the set uniquely corresponds; wherein the number of subsets that can be divided is set to 111.
- the total m value of the subset and the size of the m subsets are uniquely determined by the channel bandwidth (BW chamel , Channel Bandwidth) value.
- BW chamel Channel Bandwidth
- the base station informs the RN of the information in Table 2.
- the m value is unique for each system bandwidth.
- the reserved N VRBs or VRB pairs for carrying the R-PDCCH uniquely correspond to the division manner of the subset; wherein the number of subsets that can be divided is set to 111.
- the determination of the m value is exactly the same as in the fifth embodiment.
- the manner in which the RN determines its own R-PDCCH in the allocated subset is completely the same as the method in the second embodiment or the fourth embodiment. I won't go into details here.
- the subset partitioning method is determined by the BW chaimd value but the partitioning mode is not unique.
- the RN looks up Table 2. Since the m value is not unique under each channel bandwidth, a plurality of subsets corresponding to multiple m values are obtained.
- the RN can know all the subsets currently divided, that is, the total number of subsets is 3, and there are 2, 3, and 3 VRBs or VRB pairs in each subset. . Furthermore, the RN performs blind detection on each of the three subsets until it detects its own R-PDCCH.
- the network side notifies the RN to carry the VRB or VRB pair index information of its R-PDCCH through the PDCCH.
- the RN can directly learn the specific VRB or VRB pair index included in the subset in which the R-PDCCH is located on the PDCCH, so that the RN can directly detect the R-PDCCH in the VRB or VRB pair index without knowing other information.
- the RN does not need to know all the subsets. That is to say, at this time, the RN obtains a specific VRB or VRB pair index, and there is no concept of a subset.
- the eNB uses the dedicated high-layer signaling to explicitly inform the new VRB or VRB pair index where the R-PDCCH is located in a certain subframe, and the so-called new The VRB or VRB pair index is changed from the initial VRB or VRB pair index notified by the network side in the eighth embodiment. That is, in the next subframe, the RN blindly checks its own R-PDCCH in the above new VRB or VRB pair index. As in the eighth embodiment, the specific VRB or VRB pair index is obtained for the RN, and there is no concept of subset.
- RN 1 in subset 1
- RN 2 in subset 2
- RN 3 in subset 3. All of this information must be agreed between the eNB and the RN in advance.
- RN 1 will blindly check its R-PDCCH directly in subset 1
- RN 2 will blindly check its R-PDCCH directly in subset 2
- RN 3 will blindly check it directly in subset 3.
- This example is for notification methods for DL grant and UL grant methods.
- the DL grant and the UL grant each have their own VRB or VRB pair index.
- the network side notifies the RN of the VRB that carries the DL grant and the UL grant through the PDCCH.
- the RN When the RN performs the initial access, the PDCCH can be received. Therefore, the RN directly learns the VRB or VRB pair index of the DL grant and the UL grant respectively on the PDCCH, so that the RN does not need to know other information, directly in the VRB where the DL grant is located. Or blindly check the DL grant of the VRB pair index, and blindly check its own UL grant in the VRB or VRB pair index where the UL grant is located. In this case, the RN does not need to know
- the overall configuration of the subset, that is, at this point for the RN is a specific VRB or VRB pair index, there is no concept of a subset.
- the eNB uses the dedicated high-layer signaling to explicitly inform the new VRB or VRB pair index where the DL grant and the UL grant are located in a certain subframe.
- the new VRB or VRB pair index is changed from the initial VRB or VRB pair index notified in Example 8.
- the RN blindly checks its own DL grant in the new VRB or VRB pair index in which the DL grant is located, and blindly checks its own UL grant in the new VRB or VRB pair index in which the UL grant is located.
- the RN gets a specific VRB or VRB pair index, and there is no concept of subset.
- the system fixes the total number of subsets of the DL grant to four, and the three VRBs or VRB pairs included in each subset, and at the same time, which three VRB or VRB pair indexes are fixed; the total number of subsets of the UL grant is fixed to 2 The two VRBs or VRB pairs included in each subset, and which two VRB or VRB pair indexes are fixed.
- RN 1 DL grant of RN2 and RN5 is located in subset 1
- UL grant is located in subset 1
- RN 3 DL grant of RN4 is located in subset 2
- UL grant is located in subset 2
- the DL grant is located in subset 3 and the UL grant is located in subset 2. All of this information must be agreed between the eNB and the RN.
- RN 1, RN2, and RN5 directly detect the DL grant subset 1 when blindly checking the DL grant; when the UL grant is blindly checked, it is directly detected in the UL grant subset 1.
- RN 3 and RN4 will directly detect in the DL grant subset 2 when blindly checking the DL grant; when the UL grant is blindly checked, it will be directly detected in the UL grant subset 2.
- RN 6, RN7, and RN8 blindly check the DL grant, they will directly detect in the DL grant subset 3; when the UL grant is blindly checked, it will be directly detected in the UL grant subset 2. This completely fixed approach is more suitable for situations where there are fewer RNs.
- FIG. 4 is a schematic structural diagram of a system for detecting a downlink control channel of a relay node according to the present invention.
- the system partitioning unit 40, an allocating unit 41, and a determining unit 42 for detecting a downlink control channel of a relay node, and a dividing unit are shown in FIG. 40 and the allocating unit 41 is disposed on the network side, and the determining unit 42 is disposed on the RN;
- a dividing unit 40 configured to divide the R-PDCCH available resources of the network side into a subset; and an allocating unit 41, configured to allocate at least one of the subsets to the RN;
- the determining unit 42 is configured to determine an R-PDCCH of the RN in the allocated subset.
- the above allocating unit 41 further allocates only one subset to the RN or all the subsets to the RN.
- the dividing unit 40 further determines the subset division manner by using the total number of VRBs or VRB pairs reserved for the R-PDCCH reserved by the network; or, using the channel bandwidth to determine the corresponding subset division manner for each channel bandwidth. ;
- the total number of reserved VRBs or VRB pairs corresponds to a subset division manner, or the total number of reserved VRBs or VRB pairs corresponds to more than two subset division modes; or, each channel bandwidth corresponds to A subset partitioning mode, or each channel bandwidth corresponds to more than two subset partitioning modes.
- the system of the present invention further includes: a notification unit (not shown in FIG. 4), configured on the network side, for not notifying the RN of the RN to which the RN belongs.
- the determining unit 42 further determines the subset division manner according to the reserved total number of VRBs or VRB pairs or the channel bandwidth, and performs blind detection on the determined subsets until the R-PDCCH of the RN is determined; or When the subset division mode cannot be determined, all subsets corresponding to the subset division manner are blindly detected until the R-PDCCH of the self is determined.
- the clearing system further includes: a notification unit (not shown in FIG. 4), configured on the network side, configured to notify the RN of the R-PDCCH subset range;
- the determining unit performs blind detection on the subset of the notified subset in turn until determining its own R-PDCCH.
- the system of the present invention further includes: a notification unit, configured on the network side, for implicitly notifying the R-PDCCH subset of the RN bearer, on the basis of the system for detecting the downlink control channel of the relay node;
- the above determining unit 42 performs blind detection on the subset of implicit notifications in turn until it determines its own R-PDCCH.
- the implicit notification is that the subset index number of the R-PDCCH of the RN is determined by the RN ID or the total number of subsets or the total number of reserved VRBs or VRB pairs, or any of the above three parameters. The combination is determined together.
- the determining unit 42 further detects the R-PDCCH of the RN in the notified subset.
- the system of the present invention further includes:
- the VRB or VRB pair index information notification unit is configured to notify the RN to carry the VRB or VRB pair index information of the R-PDCCH by using the PDCCH when the RN initially accesses, or notify the RN to carry the R-PDCCH VRB or VRB by using the high layer signaling. Pair index information.
- the dividing unit 40 further fixes or semi-statically fixes the total number and size of the subsets; the foregoing allocating unit 41 further fixes or semi-statically fixes the index number of the R-PDCCH subset of the bearer RN; the determining unit 42 further determines that the RN is carried.
- the system for detecting the downlink control channel of the relay node shown in FIG. 4 is designed to implement the foregoing method for detecting the downlink control channel of the relay node, and the implementation functions of the foregoing processing units can be referred to. It is understood by the related description of the foregoing method.
- the functions of the processing unit can be implemented by a program running on the processor, or by a specific logic circuit.
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Description
一种检测中继物理下行控制信道的方法及系统 技术领域
本发明涉及中继节点下行控制信道 ( R-PDCCH , Relay Physical Downlink Control Channel )的确定技术, 尤其涉及一种能确定 R-PDCCH分 配方式及承载方式的检测中继节点下行控制信道的方法及系统。 背景技术
长期演进(LTE, Long Term Evolution ) 系统、 高级长期演进( LTE- A, Long Term Evolution- Advanced ) 系统和高级国际移动通信系统 (IMT-A, International Mobile Telecommunication- Advanced ) 都是以正交频分复用 ( OFDM, Orthogonal Frequency Division Multiplexing )技术为基础的通信 系统。 OFDM系统中, 数据为时频两维格式, 1个子帧 (subframe ) 由 2个 时隙 (slot )组成, 如果釆用正常循环前缀(CP, Cyclic Prefix ), 每个 slot 由 7个 OFDM符号组成; 如果釆用扩展 CP, 每个 slot由 6个 OFDM符号 组成。 其中, 下行控制信道 ( PDCCH, Physical Downlink Control Channel ) 位于前 1或 2或 3或 4个 OFDM符号上。 在 LTE通信系统中, PDCCH传 输的信息由下行 4受权信息 (DL grant )和上行 4受权信息 ( UL grant ) 两部分 组成。
为了方便描述, 在 LTE通信系统中, 定义以下的术语及约定:
1、 资源单元( RE , Resource Element ): 最小的时频资源块, 占据 1个 OFDM符号上的 1个子载波。
2、 资源单元组(REG, Resource Element Group): 根据每个 OFDM符 号上参考符号位置的不同, 1个 REG可以由 4个或 6个 RE组成。
3、 控制信息单元 (CCE, Control Channel Element ): 由 36个 RE、 9
个 REG组成, CCE中包含的信息有用户的 DL grant和 UL grant。
4、 物理资源块(PRB, Physical Resource Block ): 在时间域上占据连续 1个时隙, 频率域上占据连续 12个子载波。
5、 物理资源块对(PRB pair ): 时间域上占据连续 1个子帧, 频率域上 占据连续 12个子载波。
6、 虚拟资源块(VRB, Virtual Resource Block ): 为逻辑上的概念, 大 小和 PRB—样。 根据 VRB到 PRB的映射方式的不同, 又可分两种类型, 即连续式 VRB和离散式 VRB。 同理, VRB pair和 PRB pair大 '〗、也相同。
在 LTE系统中, PDCCH的映射过程简单描述如下:
在发射端, 基站 (eNB, Enhanced Node B )对 PDCCH的映射具体包 括:
第 1步, 将其下属所有的用户 (UE, User Equipment ) 的 PDCCH (包 括 DL grant和 UL grant )进行独立编码, 即每个 UE的 PDCCH可以釆用不 同的编码速率。
第 2步,将编码后所有的 PDCCH进行串联,再用小区专用序列进行加 扰, 并得到一串控制信息单元 CCE。
第 3步, 对上述一串 CCE进行 QPSK调制。
第 4步, 对上述符号以 REG为单元进行交织, 并按照先时域后频域的 方式映射到前 1或 2或 3或 4个 OFDM符号上。
在接收端, UE利用小区专用参考符号 (CRS, Cell specific Reference Signals )对 PDCCH 进行解调, 并对 CCE进行盲检测, 最终得到各自的 PDCCH。
由于未来无线通信或蜂窝系统要求增加覆盖范围, 支持更高速率传输, 这对无线通信技术提出了新的挑战。 同时, 系统建造和维护的费用问题更 加突出。 随着传输速率及通信距离的增加, 电池的耗能问题也变得突出,
而且未来的无线通信将会釆用更高频率, 由此造成的路径损耗衰减更加严 重。 为了增加高数据速率、 组移动性、 临时网络部署的覆盖范围, 提高小 区边缘的吞吐量, 以及为蜂窝系统的覆盖漏洞内的用户提供服务, 无线通 信系统中引入了中继(Relay )技术, 因此中继技术被视为第四代( 4G, 4th Generation ) 的一项关键技术。
图 1为根据相关技术的包含 RN的系统架构示意图,如图 1所示,在移 动通信系统中 eNB与中继节点 (RN, Relay Node )之间的链路称为中继链 路(Backhaul Link ), 也称为回程链路; RN与其覆盖范围下的用户之间的 链路称为接入链路( Access Link ), eNB与其覆盖范围下的 UE之间的链路 称之为直传链路 ( Direct Link )„ 对 eNB来说, RN就相当于一个 UE; 对 UE来说, RN就相当于 eNB。
目前,在釆用带内中继( inband-relay )方式时,即 backhaul link和 access link使用相同的频带, 为了避免 RN自身的收发干扰, RN不能在同一频率 资源上同时进行发送和接收的操作。当 RN给其下属 UE发送下行控制信息 时, 接收不到来自 eNB的下行控制信息。 图 2为根据相关技术的帧结构示 意图, 如图 2所示, 在下行回程( backhaul )子帧(即 eNB向 RN传输数据 所在的子帧)上, RN首先在前 1或 2个 OFDM符号上给其下属的 UE发送 PDCCH, 然后在一段时间范围内进行从发射到接收的切换, 切换完成后, 在后面的 OFDM符号上接收来自 eNB的数据,其中包括中继节点下行控制 信道 ( R-PDCCH, Relay Physical Downlink Control Channel )和中继节点物 理下行共享信道 ( R-PDSCH, Relay Physical Downlink Shared Channel )。
eNB给 RN发送的 R-PDCCH承载在物理资源块或物理资源块对上,包 括 RN的上 /下行调度授权等信息。 图 3为根据相关技术中的 R-PDCCH与 PDCCH位置关系示意图, 如图 3所示, 在下行 backhaul子帧上, eNB半静 态地预留若干 VRB pair用于 R-PDCCH的传输。 其中, PDCCH在第 1个
slot的前 n (n≤ 3)个符号上传输, DL grant在第 1个 slot的除 PDCCH占用以 外剩余的符号上传输, UL grant在第 2个 slot上传输。
在第三代合作伙伴计划 ( 3GPP, The 3rd Generation Partnership Project ) 会议上关于 R-PDCCH的交织问题一直是讨论的焦点。 其结论是: eNB半 静态地预留若干 VRB pair用于 R-PDCCH的传输。并将一个子帧内所有 RN 的 DL grant相互交织后承载在上述 VRB pair的第 1个时隙上; 将一个子1贞 内所有 RN的 UL grant相互 织后 载在上述 VRB pair的第 2个时隙上。 RN分别在上述 VRB pair的第 1个 slot和第 2个 slot上检测其控制信息。
然而, 现有技术方案中还尚未有涉及关于如何将虚拟资源块对划分成 若干子集(subset ), RN在各自 subset内进行检测的方案。 发明内容
有鉴于此, 本发明的主要目的在于提供一种检测中继节点下行控制信 道的方法及系统,能保证中继节点对 R-PDCCH的正确检测以及降低检测下 行控制信道的复杂度。
为达到上述目的, 本发明的技术方案是这样实现的,
一种检测中继节点下行控制信道的方法, 所述方法包括:
网络侧将 R-PDCCH的可用资源划分为子集( subset ),并将所述子集中 的至少一个分配给 RN;
RN在所分配的子集中确定自身的 R-PDCCH。
优选地, 将所述子集中的至少一个分配给 RN具体为:
仅将一个子集分配给 RN, 或者将所有子集分配给 RN。
优选地, 网络侧将 R-PDCCH的可用资源划分为子集具体为:
利用网络侧预留的用于承载 R-PDCCH的 VRB或 VRB对( VRB pair ) 的总数来确定子集划分方式;
或者, 利用信道带宽来确定每种信道带宽下对应的子集划分方式。
优选地, 利用 VRB或 VRB pair的总数来确定子集的划分方式具体为: 每一预留的 VRB或 VRB pair总数对应于一种子集划分方式, 或每一 预留的 VRB或 VRB pair总数对应于两种以上的子集划分方式;
利用信道带宽来确定每种信道带宽下对应的子集总数具体为: 每种信道带宽对应于一种子集划分方式, 或每种信道带宽对应于两种 以上的子集划分方式。
优选地, 所述方法还包括: 所述网络侧不通知 RN所属的子集;
RN在所分配的子集中确定自身的 R-PDCCH具体为: RN根据承载 R-PDCCH的 VRB或 VRB pair总数或信道带宽确定出子集划分方式, 依次 对所确定出的子集进行盲检测, 直到确定出自身的 R-PDCCH; 或者, 不能 确定出子集划分方式时, 对所有的子集划分方式对应的子集分别进行盲检 测, 直到确定出自身的 R-PDCCH。
优选地, 所述方法还包括: 所述网络侧隐含通知 RN承载 R-PDCCH的
RN在所分配的子集中确定自身的 R-PDCCH具体为: RN依次对隐含 通知的子集进行盲检测, 直到确定出自身的 R-PDCCH。
优选地,所述隐含通知是指, RN的 R-PDCCH具体所在的子集索引号, 由 RN ID或者子集的总数或者预留的 VRB或 VRB pair总数而唯一确定或 者上述三个参数的任意组合共同确定。
优选地, 网络侧将一个子集分配给 RN时, RN在所分配的子集中确定 自身的 R-PDCCH具体为: RN在所述子集中检测出自身的 R-PDCCH。
优选地, 所述方法还包括:
在 RN初始接入时, 利用 PDCCH通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息;
或者,利用高层信令通知 RN承载 R-PDCCH的 VRB或 VRB pair索引
信息。
优选地, 所述方法还包括:
将承载下行授权信息和 /或上行授权信息的 PRB索引信息通知给 RN。 优选地, 网络侧将 R-PDCCH的可用资源划分为子集,并将所述子集中 的至少一个分配给 RN, 具体为:
固定或半静态固定子集的总数及大小,以及承载 RN的 R-PDCCH子集 的索引号;
RN在所分配的子集中确定自身的 R-PDCCH具体为:
RN确定出承载自身 R-PDCCH的固定或半静态固定子集, 并在所确定 的子集中检测出自身的 R-PDCCH。
优选地, 所述方法还包括:
固定或半静态固定下行授权信息和 /或上行授权信息的总数及大小, 以 及承载下行授权信息和 /或上行授权信息的 VRB或 VRB pair索引号。
一种检测中继节点下行控制信道的系统, 应用于含有 RN 的通信网络 中, 所述系统包括划分单元、 分配单元和确定单元, 所述划分单元和所述 分配单元设置于网络侧, 所述确定单元设置于 RN; 其中,
划分单元, 用于将网络侧的 R-PDCCH可用资源划分为子集; 分配单元, 用于将所述子集中的至少一个分配给 RN;
确定单元, 用于在所分配的子集中确定 RN的 R-PDCCH。
优选地, 所述分配单元进一步地, 仅将一个子集分配给 RN, 或者将所 有子集分配给 RN。
优选地, 所述划分单元进一步地, 利用网络预留的用于承载 R-PDCCH 的 VRB或 VRB pair的总数来确定子集划分方式; 或者, 利用信道带宽来 确定每种信道带宽下对应的子集划分方式; 其中,每一预留的 VRB或 VRB pair总数对应于一种子集划分方式,或每一预留的 VRB或 VRB pair总数对
应于两种以上的子集划分方式; 或者, 每种信道带宽对应于一种子集划分 方式, 或每种信道带宽对应于两种以上的子集划分方式。
优选地, 所述系统还包括: 通知单元, 设置于网络侧, 用于不通知 RN 该 RN所属的子集;
所述确定单元进一步根据预留的 VRB或 VRB pair总数或信道带宽确 定出子集划分方式, 并依次对所确定出的子集进行盲检测, 直到确定出所 述 RN的 R-PDCCH; 或者, 不能确定出子集划分方式时, 对所有的子集划 分方式对应的子集分别进行盲检测, 直到确定出自身的 R-PDCCH。
优选地, 所述系统还包括: 通知单元, 设置于所述网络侧, 用于隐含 通知 RN承载的 R-PDCCH子集;
所述确定单元依次对隐含通知的子集进行盲检测, 直到确定出自身的 R-PDCCH。
优选地,所述隐含通知是指, RN的 R-PDCCH具体所在的子集索引号, 由 RN ID或者子集的总数或者预留的 VRB或 VRB pair总数而唯一确定或 者上述三个参数的任意组合共同确定。
优选地,所述分配单元进一步将一个子集分配给 RN时,所述确定单元 进一步在所通知的子集中检测出所述 RN的 R-PDCCH。
优选地, 所述系统还包括:
VRB或 VRB pair索引信息通知单元, 用于在 RN初始接入时, 利用 PDCCH通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息; 或者, 利 用高层信令通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息。
优选地, 所述划分单元进一步固定或半静态固定子集的总数及大小; 所述分配单元进一步固定或半静态固定承载 RN的 R-PDCCH子集的索引 号;
所述确定单元进一步确定出承载所述 RN的 R-PDCCH的固定或半静态
固定子集, 并在所确定的子集中检测出自身的 R-PDCCH。
本发明中,根据当前 R-PDCCH可用的 VRB或 VRB pair确定对子集的 划分方式, 然后再将所划分的子集分配给 RN, 其中, 可将所有子集分配给 RN,或将其中一个子集分配给 RN,也可以将其中的一部分子集分配给 RN。 此时, 可将分配给各 RN的子集显式或隐含通知给 RN, 以方便 RN根据子 集信息进行自身的 R-PDCCH的检测。本发明正是基于上述思想,在尽可能 节约网络资源的情况下实现 RN对 R-PDCCH的快速检测。本发明可以很好 地适用于包含中继节点的通信网络中,保证了中继节点对 R-PDCCH的正确 检测, 并在一定程度上降低了盲检测下行控制信道的复杂度, 提高了整个 系统的处理效率。 附图说明
图 1为根据相关技术的包含 RN的系统架构示意图;
图 2为根据相关技术的帧结构示意图;
图 3为根据相关技术中的 R-PDCCH与 PDCCH位置关系示意图; 图 4为本发明检测中继节点下行控制信道的系统的组成结构示意图。 具体实施方式
本发明的基本思想为, 根据当前 R-PDCCH可用的 VRB或 VRB pair 确定对子集的划分方式, 然后再将所划分的子集分配给 RN, 其中, 可将所 有子集分配给 RN, 或将其中一个子集分配给 RN, 也可以将其中的一部分 子集分配给 RN。 此时, 可将分配给各 RN的子集显式或隐含通知给 RN, 以方便 RN根据子集信息进行自身的 R-PDCCH的检测。
为使本发明的目的、 技术方案和优点更加清楚明白, 以下举实施例并 参照附图, 对本发明进一步详细说明。
实施例一
本示例中, 预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair与子 集的划分方式唯一对应; 其中, 所能划分的子集数设为 m。 以下详细描述 之。
基站将半静态预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair划 分成 m个 subset, m值以及这 m个 subset的大小均由 N值唯一确定。 具体 的确定方式如表 1所示, 其中, 每个 subset中包含的 VRB或 VRB pair是 连续的, 但是 VRB或 VRB pair到 PRB或 PRB pair的映射可以是连续的, 也可以是离散的, 但是其划分方式却是唯一的, 具体划分方式如表 1所示。 表 1中 subset的最大数为 5个。 也可根据需要, 设置超过 5个 subset的情 况。 表 1中, 当 subset为多个时, 每个 subset中分配的 VRB或 VRB pair 尽可能均等。
其中, 无论 N值是多少, 都包含一种可能性, 即只有 1个 subset的情 况, 如表 1所示, 在各种 N取值下, m都为 1 , 即 subset的大小就等于半 静态预留的 VRB或 VRB pair个数 N。假设 eNB半静态地分配了 10个 VRB 或 VRB pair用于 R-PDCCH, 那么 subset的大小即为 10, RN只要在这 10 个 VRB或 VRB pair内进行盲检测即可,直到盲检出自身的 R-PDCCH为止。
此外,还包括多个 subset的情况,例如, N = 8时即默认划分为 3个 subset, 即 m = 3 , 每个 subset中包含的 VRB或 VRB pair个数如表 1所示。 表 1只 列举到了 N = 20 , 大于 20的情况就不再进行——列举。 表 1中 subset的最 大数为 5个。也可根据需要,设置超过 5个 subset的情况。表 1中,当 subset 为多个时, 每个 subset中分配的 VRB或 VRB pair尽可能均等。 具体的, 对于预留的用于承载 R-PDCCH VRB或 VRB pair总数 N大于 20的情况, 根据前述的 subset 划分原则进行划分。 本发明一旦确定出如表 1 所示的 subset划分方式,即相当于根据预留的用于承载 R-PDCCH VRB或 VRB pair 总数 N直接确定出了 subset的具体划分方式,这样, RN即可根据表 1所示
的对应信息, 根据预留的用于承载 R-PDCCH VRB或 VRB pair总数确定出 网络侧所划分出的 subset方式。例如, 当 N = 18时, m = 3 ,对应的 3个 subset 中分别有 6个 VRB或 VRB pair。
表 1
本示例中, RN在初始化时, 基站将表 1所示的对应信息告知 RN, 这 样 RN在得知了 N值后, 根据表 1进行查找, 便可得到 subset的整体配置 情况了。例如,若 N = 10 ,则 RN便获知共有 3个 subset,且 subset 1和 subset 2中有 3个 VRB或 VRB pair, subset 3中有 4个 VRB或 VRB pair。 这样, 当网络侧未通知 RN承载该 RN的 R-PDCCH的子集具体是哪个时 , RN可 以首先对 subset 1进行盲检, 如果没有检测到其相应的 R-PDCCH, 则继续 对 subset 2进行盲检, 没有则继续对 subset 3进行盲检, 直到盲检出其相应 的 R-PDCCH为止。
此外, 当 subset总数较多时, RN在对 subset进行盲检测时, 为了减少 盲检测次数, 可以对需要检测的子集索引 (subset index )进行限定。 例如, 当 N = 20时, 如果不做限定则需要对 5个 subset分别进行盲检测, 盲检次数 比较庞大。 如果 eNB和 RN预先约定好, 承载 RN的 R-PDCCH的子集仅 是编号为奇数或仅是编号为偶数的子集, 或者, 设定承载 RN的 R-PDCCH 的子集的范围, 这样, RN只对奇数 subset或偶数 subset或在某几个特定的 subset进行盲检测, 即可检测到自身的 R-PDCCH , 这样便大大减少了盲检 测次数。
实施例二
本示例中, 预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair与子 集的划分方式唯一对应; 其中, 所能划分的子集数设为 m。 m值的确定方 式与实施例一完全相同。
本示例中,基站除了告知 RN所有的 subset划分方式以夕卜,还隐含的告 知每个 RN各自所属的子集索引号 ( subset index )。
首先, RN根据 N值以及网络侧所通知的表 1来获知所有的 subset; 其 次, 根据 subset的总数等参数和中继节点标识(RN-ID )之间的隐含关系来 获知承载自身的 R-PDCCH所在的 subset index。 作为一种实现方式, 可以
通过以下方式确定承载 RN的 R-PDCCH所在的 subset index: subset index = RN-ID mod Nsubset ,其中 RN-ID为 RN的临时网络标识, Nsubset 为 subset的总数 N。
在这种情况下, RN无需相实施例一那样对 m个 subset或特定的 subset 分别进行盲检测, 而只要在自身所属的 subset index对应的子集中进行
R-PDCCH的盲检即可, 大大减少了盲检次数。
实施例三
本示例中, 预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair与子 集的划分方式唯一对应; 其中, 所能划分的子集数设为 111。 对于 m值由 N 值确定但不唯一的情况, 具体处理方式如下:
基站将 m值限定为 {1,2,3,4} , 即同一个 N值对应了 4种不同的 m值。 为使 RN确定出 m值, 网络侧需在 R-PBCH中用 2 比特来通知 RN。 例如, 当 N = 15时, 可通过下述方式来指示 m值:
R-PBCH中承载的指示比特为 00时, 代表 m = l , 即只有 1个 subset; R-PBCH中承载的指示比特为 01时,代表 m = 2 , 即划分为 2个 subset, 每个 subset中分别有 7和 8个 PRB pair;
R-PBCH中承载的指示比特为 10时,代表 m = 3 , 即划分为 3个 subset, 每个 subset有 5个 PRB pair;
R-PBCH中承载的指示比特为 11时,代表 m = 4 , 即划分为 4个 subset, 每个 subset分别包含 4、 4、 4和 3个 PRB pair。
如果 RN收到 R-PBCH中承载的指示比特为 10, 则 RN便获知了所有 的 subset, 即 subset总数为 3 , 每个 subset有 5个 PRB pair0 进而 , RN对 这 3个 subset分别进行盲检测, 直到检测出自身的 R-PDCCH为止。
此外, 如果本示例中, 不利用 R-PBCH向 RN通知子集的划分方式, 那么, RN首先对 m = l进行盲检, 此时默认为只有 1个 subset, RN只要在
该 subset 内盲检测自身的 R-PDCCH 即可。 如果没有检测出 自身的 R-PDCCH, 再对 m = 2下对应的 2个 subset分别进行盲检, 先检测 subset 1 , 没有再检测 subset 2。 如果仍然没有检测出自身的 R-PDCCH, 再对 m = 3下 对应的 3个 subset分别进行盲检,依此类推,直到盲检出其相应的 R-PDCCH 为止。
实施例四
本示例中, 预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair与子 集的划分方式唯一对应; 其中, 所能划分的子集数设为 111。 对于 m值由 N 值确定但不唯一的情况, 具体处理方式如下:
其中 m值的确定与前述实施例三完全相同。 例如, 当 N = 18时, 如果
R-PBCH指示 11 , 则代表 m = 4 , 所有的 subset为: 4个 subset, 每个 subset 分别包含 4, 4, 4和 6个 VRB或 VRB pair;如果 R-PBCH指示 10,则 m = 3 , 所有的 subset为: 3个 subset, 每个 subset分别包含 6个 VRB或 VRB pair„ 本示例中,基站除了通过 R-PBCH告知 RN subset的划分方式以外, 还 隐含的告知每个 RN各自所属的子集索引号 (subset index )。 作为一种实现 方式, 可以通过以下方式确定承载 RN的 R-PDCCH所在的 subset index: subset index = RN-ID mod Nsubset ,其中 RN-ID为 RN的临时网络标识, Nsubset 为 subset的总数 N。
假设 RN收到 R-PBCH中承载的指示比特为 11 , 则 RN便获知了上述 所有的 subset, 即 subset总数为 4, 每个 subset分别包含 4、 4、 4和 6个 VRB 或 VRB pair。 进而根据 subset index = RN-ID mod 4计算出自身所在的 subset index„ 最后, 在该 subset index中进行盲检 R-PDCCH即可, 此时无 需对其余的 subset进行盲检。
实施例五
本示例中, 预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair与子
集的划分方式唯一对应; 其中, 所能划分的子集数设为 111。
本示例中, subset的总数 m值以及这 m个 subset的大小均由信道带宽 ( BWchamel , Channel Bandwidth )值唯一确定。 具体的, 如表 2所示, 分别 列举了不同信道带宽下, 所对应的 subset 的划分情况。 例如, 当 BWchamel = 1.25MHz时,该带宽下总共有 6个 PRB。 m = 1对应只有 1个 subset , 其大小为 3个 VRB或 VRB pair; m = 2对应有 2个 subset, subset 1包含 1 个 VRB或 VRB pair, subset 2包含 2个 VRB或 VRB pair。当 BWchamd = 10MHz 时, 对应总共有 50个 RB, subset的总数可以 1个、 2个和 3个, 具体划分 方式如表 2所示。 其中, m值以及这 m个 subset的大小也可以有其它的取 值。
虽然表 2中列举的每种信道带宽下 m有几种不同的取值, 但是此时只 能取唯一的值。
RN在初始化时, 基站将表 2中的信息告知 RN。
每个系统带宽下 m值是唯一的,即表 2中每种带宽下仅有一个 m值时, RN在得知系统带宽后, 通过查找表 2 , 即可确定所有的 subset。 例如, BWchamel = 20MHz时, m值为 4, 那么 RN便获知共有 4个 subset, subset 1 , 2, 3和 4中分别包含 4, 5 , 6和 7个 VRB或 VRB pair。 于是, RN首先对 subset 1进行盲检, 如果没有检测到其相应的 R-PDCCH, 则继续对 subset 2 进行盲检, 没有则继续对 subset 3 进行盲检, 直到盲检测出其相应的 R-PDCCH为止。
1.4MHz 6
m = 2 1 2
m = l 5
3 MHz 15
m = 2 3 2
m = l 8
5 MHz 25 m = 2 3 4
m = 3 2 3 3
m = l 12
10 MHz 50 m = 2 5 6
m = 3 3 4 5
m = l 15
m = 2 9 11
15 MHz 75
m = 3 5 6 7
m = 4 4 4 5 5
m = l 18
m = 2 10 15
20 MHz 100 m = 3 6 7 8
m = 4 4 5 6 7
实施例六
本示例中, 预留的用于承载 R-PDCCH的 N个 VRB或 VRB pair与子 集的划分方式唯一对应; 其中, 所能划分的子集数设为 111。
本示例中, m值的确定与同实施例五完全相同。 其中, RN在所分配的 子集中确定自身的 R-PDCCH 的方式与实施例二或实施例四的确定方式完 全相同。 这里不再赘述。
实施例七
本示例中, 子集划分方式由 BWchaimd值确定但是划分方式不唯一。 RN在得知信道带宽后, 查找表 2, 由于每个信道带宽下 m值不是唯一 的, 因此得到多个 m值下对应的多种 subset的划分。 为使 RN确定出当前
subset划分方式,此时可通过在 R-PBCH中用 2 比特来通知 RN当前的 subset 划分方式。 例如, 当 BWehamd = 5MHz时,
R-PBCH中承载的指示比特为 00时, 代表 m = l , 即只有 1个 subset;
R-PBCH中承载的指示比特为 01时,代表 m = 2 , 即划分为 2个 subset, 每个 subset中分别有 3和 4个 VRB或 VRB pair;
R-PBCH中承载的指示比特为 10代表 m = 3 , 即划分为 3个 subset, 每 个 subset中分别有 2, 3和 3个 VRB或 VRB pair。
假设 RN收到 R-PBCH中承载的指示比特为 10, 则 RN即可获知了当 前所划分的所有 subset, 即 subset总数为 3 , 每个 subset中分别有 2、 3和 3 个 VRB或 VRB pair。 进而, RN对这 3个 subset分别进行盲检测, 直到检 测出自身的 R-PDCCH为止。
此外,如果不用 R-PBCH对 RN进行划分方式通知的话, RN首先对 m = 1 进行盲检, 此时只有 1 个 subset, RN 只要在该 subset 内盲检测自身的 R-PDCCH即可。 如果没有检测出其相应的 R-PDCCH , 再对 m = 2下对应的 2个 subset分别进行盲检, 先检测 subset 1 , 没有在检测 subset 2。 如果仍然 检测出其相应的 R-PDCCH,最后对 m = 3下对应的 3个 subset分别进行盲检, 直到盲检出其相应的 R-PDCCH为止。
实施例八
本发明, 可在 RN进行初始接入时, 网络侧通过 PDCCH来通知 RN承 载其 R-PDCCH的 VRB或 VRB pair index信息。 这样, RN直接在 PDCCH 上获知其 R-PDCCH所在的 subset中包括的具体的 VRB或 VRB pair index, 这样 RN无需获知其它信息, 直接在上述 VRB或 VRB pair index内盲检 R-PDCCH即可。 这种情况下, RN无需获知所有的 subset, 也就是说, 此 时对 RN来说得到的是具体的 VRB或 VRB pair index, 已经没有 subset的 概念了。
实施例九
在 RN的非初始接入时刻, 即正常通信时刻, 在某一子帧内 eNB利用 专用高层信令,明确的告知其 R-PDCCH所在的新的 VRB或 VRB pair index, 此时所谓的新的 VRB或 VRB pair index和实施例八中网络侧告知的初始 VRB或 VRB pair index相比, 有所更改。 即到了下一子帧, RN便在上述 新的 VRB或 VRB pair index中盲检自身的 R-PDCCH。 同实施例八一样, 此时对 RN来说得到的是具体的 VRB或 VRB pair index, 已经没有 subset 的概念了。
实施例十
假设系统将 subset的总数固定为 3个, 每个 subset中包含的 4个 VRB 或 VRB pair, 同时固定好是哪 4个 VRB或 VRB pair index。 此外, 还需要 固定好 RN 1位于 subset 1 , RN 2位于 subset 2以及 RN 3位于 subset 3。 所 有这些信息, 都要事先在 eNB和 RN之间相互约定好。 在 eNB和 RN进行 通信时, RN 1会直接在 subset 1内盲检其 R-PDCCH, RN 2则会直接在 subset 2内盲检其 R-PDCCH, RN 3会直接在 subset 3内盲检其 R-PDCCH。
这种完全固定的方式, 比较适用于 RN较少的情况。
实施例十一
本示例针对的是 DL grant和 UL grant 载方式的通知方法。
DL grant和 UL grant分别有其各自的 VRB或 VRB pair index。
网络侧通过 PDCCH来通知 RN承载 DL grant和 UL grant的 VRB或
VRB pair index信息。 当 RN进行初始接入时, 可以接收到 PDCCH, 因此 RN直接在 PDCCH上获知其 DL grant和 UL grant各自所在的 VRB或 VRB pair index , 这样 RN无需获知其它信息, 直接在上述 DL grant所在的 VRB 或 VRB pair index中盲检自身的 DL grant, 在上述 UL grant所在的 VRB或 VRB pair index中盲检自身的 UL grant即可。 这种情况下, RN无需获知
subset的整体配置情况, 也就是说, 此时对 RN来说得到的是具体的 VRB 或 VRB pair index , 已经没有 subset的概念了。
在 RN的非初始接入时刻, 即正常通信时刻, 在某一子帧内 eNB利用 专用高层信令,明确的告知其 DL grant和 UL grant各自所在的新的 VRB或 VRB pair index ,此时所谓的新的 VRB或 VRB pair index和实施例八告知的 初始 VRB或 VRB pair index相比, 有所更改。 到了下一子帧, RN便在上 述 DL grant所在的新的 VRB或 VRB pair index中盲检自身的 DL grant, 在 上述 UL grant所在的新的 VRB或 VRB pair index中盲检自身的 UL grant。 此时对 RN来说得到的是具体的 VRB或 VRB pair index, 已经没有 subset 的概念了。
假设系统将 DL grant的 subset的总数固定为 4个, 每个 subset中包含 的 3个 VRB或 VRB pair, 同时固定好是哪 3个 VRB或 VRB pair index; 将 UL grant的 subset的总数固定为 2个,每个 subset中包含的 2个 VRB或 VRB pair, 同时固定好是哪 2个 VRB或 VRB pair index。 此外, 还需要固定好: RN 1 , RN2和 RN5的 DL grant位于 subset 1 , UL grant位于 subset 1 ; RN 3 , RN4的 DL grant位于 subset 2, UL grant位于 subset 2; RN 6, RN7 ,和 RN8 的 DL grant位于 subset 3 , UL grant位于 subset 2。 所有这些信息, 都要事 先在 eNB和 RN之间相互约定好。
在 eNB和 RN进行通信时 , RN 1 , RN2和 RN5在盲检 DL grant时, 会直接在 DL grant subset 1内进行检测;盲检 UL grant时,会直接在 UL grant subset 1内进行检测。
RN 3 , RN4在盲检 DL grant时, 会直接在 DL grant subset 2内进行检 测; 盲检 UL grant时, 会直接在 UL grant subset 2内进行检测。
RN 6, RN7, 和 RN8在盲检 DL grant时, 会直接在 DL grant subset 3 内进行检测; 盲检 UL grant时, 会直接在 UL grant subset 2内进行检测。
这种完全固定的方式, 比较适用于 RN较少的情况。
图 4为本发明检测中继节点下行控制信道的系统的组成结构示意图, 如图 4所示, 本发明检测中继节点下行控制信道的系统划分单元 40、 分配 单元 41和确定单元 42, 划分单元 40和分配单元 41设置于网络侧, 确定单 元 42设置于 RN; 其中,
划分单元 40, 用于将网络侧的 R-PDCCH可用资源划分为子集; 分配单元 41 , 用于将所述子集中的至少一个分配给 RN;
确定单元 42, 用于在所分配的子集中确定 RN的 R-PDCCH。
上述分配单元 41进一步地, 仅将一个子集分配给 RN, 或者将所有子 集分配给 RN。
上述划分单元 40 进一步地, 利用网络预留的用于承载 R-PDCCH 的 VRB或 VRB pair的总数来确定子集划分方式; 或者, 利用信道带宽来确定 每种信道带宽下对应的子集划分方式;
其中, 每一预留的 VRB或 VRB pair总数对应于一种子集划分方式, 或每一预留的 VRB或 VRB pair总数对应于两种以上的子集划分方式; 或 者, 每种信道带宽对应于一种子集划分方式, 或每种信道带宽对应于两种 以上的子集划分方式。
在图 4所示检测中继节点下行控制信道的系统的基础上, 本发明系统 还包括: 通知单元(图 4中未图示) , 设置于网络侧, 用于不通知 RN该 RN所属的子集;
上述确定单元 42进一步根据预留的 VRB或 VRB pair总数或信道带宽 确定出子集划分方式, 并依次对所确定出的子集进行盲检测, 直到确定出 所述 RN的 R-PDCCH; 或者, 不能确定出子集划分方式时, 对所有的子集 划分方式对应的子集分别进行盲检测, 直到确定出自身的 R-PDCCH。
或者, 在图 4所示检测中继节点下行控制信道的系统的基础上, 本发
明系统还包括: 通知单元(图 4 中未图示) , 设置于所述网络侧, 用于通 知 RN承载的 R-PDCCH子集范围;
所述确定单元依次对所通知的子集范围内的子集进行盲检测, 直到确 定出自身的 R-PDCCH。
或者, 在图 4所示检测中继节点下行控制信道的系统的基础上, 本发 明系统还包括: 通知单元, 设置于所述网络侧, 用于隐含通知 RN承载的 R-PDCCH子集;
上述确定单元 42依次对隐含通知的子集进行盲检测, 直到确定出自身 的 R-PDCCH。 其中, 所述隐含通知是指, RN的 R-PDCCH具体所在的子 集索引号, 由 RN ID或者子集的总数或者预留的 VRB或 VRB pair总数而 唯一确定或者上述三个参数的任意组合共同确定。
上述分配单元 41进一步将一个子集分配给 RN时, 上述确定单元 42 进一步在所通知的子集中检测出所述 RN的 R-PDCCH。
在图 4所示检测中继节点下行控制信道的系统的基础上, 本发明系统 还包括:
VRB或 VRB pair索引信息通知单元, 用于在 RN初始接入时, 利用 PDCCH通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息; 或者, 利 用高层信令通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息。
上述划分单元 40进一步固定或半静态固定子集的总数及大小; 上述分 配单元 41进一步固定或半静态固定承载 RN的 R-PDCCH子集的索引号; 上述确定单元 42进一步确定出承载所述 RN的 R-PDCCH的固定或半 静态固定子集, 并在所确定的子集中检测出自身的 R-PDCCH。
本领域技术人员应当理解, 本发明图 4所示的检测中继节点下行控制 信道的系统是为实现前述的检测中继节点下行控制信道的方法而设计的, 上述各处理单元的实现功能可参照前述方法的相关描述而理解。 图中的各
处理单元的功能可通过运行于处理器上的程序而实现, 也可通过具体的逻 辑电路而实现。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。
Claims
1、 一种检测中继节点下行控制信道的方法, 其特征在于, 所述方法包 括:
网络侧将中继节点下行控制信道 R-PDCCH的可用资源划分为子集,并 将所述子集中的至少一个分配给中继节点 RN;
RN在所分配的子集中确定自身的 R-PDCCH。
2、 根据权利要求 1所述的方法, 其特征在于, 将所述子集中的至少一 个分配给 RN为:
仅将一个子集分配给 RN, 或者将所有子集分配给 RN。
3、 根据权利要求 1所述的方法, 其特征在于, 网络侧将 R-PDCCH的 可用资源划分为子集为:
利用网络侧预留的用于承载 R-PDCCH的虚拟物理资源块 VRB或 VRB 对 VRB pair的总数来确定子集划分方式;
或者, 利用信道带宽来确定每种信道带宽下对应的子集划分方式。
4、 根据权利要求 3所述的方法, 其特征在于, 利用 VRB或 VRB pair 的总数来确定子集的划分方式为:
每一预留的 VRB或 VRB pair总数对应于一种子集划分方式, 或每一 预留的 VRB或 VRB pair总数对应于两种以上的子集划分方式;
利用信道带宽来确定每种信道带宽下对应的子集总数为:
每种信道带宽对应于一种子集划分方式, 或每种信道带宽对应于两种 以上的子集划分方式。
5、 根据权利要求 4所述的方法, 其特征在于, 所述方法还包括: 所述 网络侧不通知 RN所属的子集;
RN 在所分配的子集中确定自身的 R-PDCCH 为: RN 根据承载 R-PDCCH的 VRB或 VRB pair总数或信道带宽确定出子集划分方式, 依次 对所确定出的子集进行盲检测, 直到确定出自身的 R-PDCCH; 或者, 不能 确定出子集划分方式时, 对所有的子集划分方式对应的子集分别进行盲检 测, 直到确定出自身的 R-PDCCH。
6、 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括: 所述 网络侧隐含通知 RN承载 R-PDCCH的子集;
RN在所分配的子集中确定自身的 R-PDCCH为: RN依次对隐含通知 的子集进行盲检测, 直到确定出自身的 R-PDCCH。
7、 根据权利要求 6所述的方法, 其特征在于, 所述隐含通知是指, RN 的 R-PDCCH具体所在的子集索引号, 由 RN ID或者子集的总数或者预留 的 VRB或 VRB pair总数而唯一确定或者上述三个参数的任意组合共同确 定。
8、 根据权利要求 1所述的方法, 其特征在于, 网络侧将一个子集分配 给 RN时 , RN在所分配的子集中确定自身的 R-PDCCH为: RN在所述子 集中检测出自身的 R-PDCCH。
9、 根据权利要求 1至 8任一项所述的方法, 其特征在于, 所述方法还 包括:
在 RN初始接入时,利用下行控制信道 PDCCH通知 RN承载 R-PDCCH 的 VRB或 VRB pair索引信息;
或者,利用高层信令通知 RN承载 R-PDCCH的 VRB或 VRB pair索引 信息。
10、 根据权利要求 9所述的方法, 其特征在于, 所述方法还包括: 将承载下行授权信息和 /或上行授权信息的 VRB或 VRB pair索引信息 通知给 RN。
11、根据权利要求 1所述的方法, 其特征在于, 网络侧将 R-PDCCH的 可用资源划分为子集, 并将所述子集中的至少一个分配给 RN, 为: 固定或半静态固定子集的总数及大小,以及承载 RN的 R-PDCCH子集 的索引号;
RN在所分配的子集中确定自身的 R-PDCCH为:
RN确定出承载自身 R-PDCCH的固定或半静态固定子集, 并在所确定 的子集中检测出自身的 R-PDCCH。
12、 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括: 固定或半静态固定下行授权信息和 /或上行授权信息的总数及大小, 以 及承载下行授权信息和 /或上行授权信息的 VRB或 VRB pair索引号。
13、 一种检测中继节点下行控制信道的系统,应用于含有 RN的通信网 络中, 其特征在于, 所述系统包括划分单元、 分配单元和确定单元, 所述 划分单元和所述分配单元设置于网络侧, 所述确定单元设置于 RN; 其中, 划分单元, 用于将网络侧的 R-PDCCH可用资源划分为子集; 分配单元, 用于将所述子集中的至少一个分配给 RN;
确定单元, 用于在所分配的子集中确定 RN的 R-PDCCH。
14、 根据权利要求 13所述的系统, 其特征在于, 所述分配单元进一步 地, 仅将一个子集分配给 RN, 或者将所有子集分配给 RN。
15、 根据权利要求 13所述的系统, 其特征在于, 所述划分单元进一步 地,利用网络预留的用于承载 R-PDCCH的 VRB或 VRB pair的总数来确定 子集划分方式; 或者, 利用信道带宽来确定每种信道带宽下对应的子集划 分方式; 其中, 每一预留的 VRB或 VRB pair总数对应于一种子集划分方 式, 或每一预留的 VRB或 VRB pair总数对应于两种以上的子集划分方式; 或者, 每种信道带宽对应于一种子集划分方式, 或每种信道带宽对应于两 种以上的子集划分方式。
16、 根据权利要求 15所述的系统, 其特征在于, 所述系统还包括: 通 知单元, 设置于网络侧, 用于不通知 RN该 RN所属的子集; 所述确定单元进一步根据预留的 VRB或 VRB pair总数或信道带宽确 定出子集划分方式, 并依次对所确定出的子集进行盲检测, 直到确定出所 述 RN的 R-PDCCH; 或者, 不能确定出子集划分方式时, 对所有的子集划 分方式对应的子集分别进行盲检测, 直到确定出自身的 R-PDCCH。
17、 根据权利要求 13所述的系统, 其特征在于, 所述系统还包括: 通 知单元, 设置于所述网络侧, 用于隐含通知 RN承载的 R-PDCCH子集; 所述确定单元依次对隐含通知的子集进行盲检测, 直到确定出自身的 R-PDCCH。
18、 根据权利要求 17所述的系统, 其特征在于, 所述隐含通知是指, RN的 R-PDCCH具体所在的子集索引号, 由 RN ID或者子集的总数或者预 留的 VRB或 VRB pair总数而唯一确定或者上述三个参数的任意组合共同 确定。
19、 根据权利要求 13所述的系统, 其特征在于, 所述分配单元进一步 将一个子集分配给 RN时,所述确定单元进一步在所通知的子集中检测出所 述 RN的 R-PDCCH。
20、 根据权利要求 13至 19中任一项所述的系统, 其特征在于, 所述 系统还包括:
VRB或 VRB pair索引信息通知单元, 用于在 RN初始接入时, 利用 PDCCH通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息; 或者, 利 用高层信令通知 RN承载 R-PDCCH的 VRB或 VRB pair索引信息。
21、 根据权利要求 13所述的系统, 其特征在于, 所述划分单元进一步 固定或半静态固定子集的总数及大小; 所述分配单元进一步固定或半静态 固定承载 RN的 R-PDCCH子集的索引号;
所述确定单元进一步确定出承载所述 RN的 R-PDCCH的固定或半静态 固定子集, 并在所确定的子集中检测出自身的 R-PDCCH。
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