WO2014067124A1 - 确定控制信道搜索空间的方法和装置 - Google Patents
确定控制信道搜索空间的方法和装置 Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- Embodiments of the present invention relate to the field of communications, and in particular, to a method and apparatus for determining a control channel search space. Background technique
- Orthogonal Frequency Division Multiplexing is a system key multiple access technology for the Beyond Third Generation (B3G) / fourth generation mobile communication system (The fourth generation; 4G) mobile communication system.
- B3G Third Generation
- 4G fourth generation mobile communication system
- an OFDM radio frame has a length of 10 ms and contains 10 subframes. Each subframe has a length of 1 ms, and each subframe includes 2 slots, each slot containing 7 or 6 OFDM symbols.
- one OFDM radio frame is composed of a plurality of subcarriers.
- One subcarrier under one OFDM symbol is called a resource element (Resource Element; RE)
- RE resource element
- RE resource element
- RE resource element
- Rsource resource element group
- CCE Control Channel Element
- 12 subcarriers and one time slot constitute a resource block (RB).
- the RB is divided into a Physical Resource Block (PRB) and a Virtual Resource Block (VRB);
- PRB refers to the actual frequency of the RBs, numbered from small to large; two PRBs form a PRB pair;
- the VRB uses another numbering form different from the PRB to map the VRB to the PRB through a specific resource allocation method.
- Various control information, reference signals, or service data are transmitted on these time-frequency resources.
- the Physical Downlink Control Channel is a channel defined in the LTE Release-8/Release-9/Release-10.
- the PDCCH carries downlink control information (Downlink Control Information; DCI).
- the DCI includes scheduling information, power control information, and the like of a downlink data channel or an uplink data channel.
- the Evolved Node B eNB
- the Evolved Node B can determine the search space of the PDCCH according to the aggregation level J (Aggregation Level), and the user equipment (User Equipment; UE) searches for the valid in the determined search space.
- PDCCH has four aggregation levels, which are 1, 2, 4, and 8, respectively.
- the PDCCH is mapped to 1, 2, 4, and 8 CCEs. For an aggregation level, there is a corresponding search space size and a number of candidate PDCCHs, that is, a PDCCH location to which one PDCCH may be mapped.
- An Enhanced Physical Downlink Control Channel (EPDCCH) is also introduced in LTE Release-11.
- the EPDCCH occupies the physical resources of the data channel, and is multiplexed with the data channel by frequency division multiplexing.
- the number of resources occupied by the EPDCCH is signaled to the UE by the upper layer or the physical layer.
- the eNB allocates one or more sets of time-frequency resources for the EPDCCH of the search space, and a group of physical resources is called an EPDCCH set.
- the aggregation level of the EPDCCH determines the number of enhanced CVCs (eCCEs) occupied by the EPDCCH.
- eCCEs enhanced CVCs
- the transmission scheme of the EPDCCH can be classified into localized and distributed (distributed) according to whether the resources used by the resources are continuous in the frequency domain.
- the search space in the prior art is determined in such a manner that multiple EPDCCH sets or UEs use the same search space. When the number of users increases, the congestion on the control channel is serious, and the search space conflict phenomenon is obvious. Summary of the invention
- embodiments of the present invention provide a method and apparatus for determining a control channel search space, which can reduce the probability of a control channel search space collision.
- the first aspect is specifically implemented as: a method for determining a control channel search space, including: determining a number of an EPDCCH set for transmitting at least two groups of an enhanced physical downlink control channel EPDCCH; according to the number of the EPDCCH set, Determining a location offset of the search space corresponding to the EPDCCH set; determining a search space corresponding to the EPDCCH set according to a location offset of the search space corresponding to the EPDCCH set.
- the method further includes: determining the number of the EPDCCH set for transmitting at least two groups of the enhanced physical downlink control channel EPDCCH, including: determining, for transmitting, the EPDCCH a first number of the first EPDCCH set and a second number of the second EPDCCH set for transmitting the EPDCCH.
- the specific implementation is: determining, according to the number of the EPDCCH set, a search space corresponding to the EPDCCH set Determining, by the first number, a first location offset of the search space corresponding to the first EPDCCH set, or determining, according to the second number, a search corresponding to the second EPDCCH set The second position of the space is offset.
- the first possible implementation manner of the first aspect or the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect is specifically implemented as follows:
- Determining a search space corresponding to the EPDCCH set, and determining a search space corresponding to the EPDCCH set including: determining, according to the first location offset, a search space corresponding to the first EPDCCH set, or according to the second location Offset, determining a search space corresponding to the second EPDCCH set. Or determining, according to the first location offset, a search space corresponding to the second EPDCCH set.
- a method for determining a control channel search space including: determining a first number of a first EPDCCH set for transmitting an EPDCCH or a second number of a second EPDCCH set; determining, according to the first number, Determining a first position offset of the search space corresponding to the first EPDCCH set; determining a first offset parameter; determining the second position offset according to the first offset parameter and the first position offset. Determining, according to the first location offset, a search space corresponding to the first EPDCCH set; and determining, according to the second location offset, a search space corresponding to the second EPDCCH set.
- the method further includes: determining the first offset parameter, including: determining that the first offset parameter is an integer greater than 0 and less than 65538, or The cell identifier determines a first offset parameter, or determines a first offset parameter based on the UE identity.
- the first offset parameter is 39827.
- the second aspect or the first possible implementation manner of the second aspect is specifically implemented by: determining, according to the cell identifier, the first offset parameter, including: according to the cell identifier and the The number of virtual resources in the second EPDCCH set, or the number of physical resources in the second EPDCCH set, or the number of virtual resources corresponding to the cell identifier and the unit physical resource, or according to the cell identifier and the EPDCCH transmission mode, or The first offset parameter is determined according to the cell identity and the EPDCCH aggregation level.
- the specific implementation is as follows: determining the first offset parameter according to the UE identifier, including: according to the UE identifier and the The number of virtual resources in the second EPDCCH set, or according to the UE identifier and the number of physical resources in the second EPDCCH set, or according to the UE identifier and the number of virtual resources corresponding to the unit physical resource, or according to the UE identifier and the EPDCCH transmission mode, or according to The UE identifier and the EPDCCH aggregation level determine the first offset parameter.
- the determining the first parameter further includes: according to the number of virtual resources in the second EPDCCH set, or according to the physical in the second EPDCCH set The number of resources, or according to the number of virtual resources corresponding to the unit physical resources, or according to the EPDCCH transmission mode, or according to the cell identity and the EPDCCH aggregation level, the first offset parameter is determined.
- a method for determining a control channel search space including: determining a first number of a first EPDCCH set for transmitting an EPDCCH or a second number of a second EPDCCH set; determining, according to the first number, Determining a first location offset of the search space corresponding to the first EPDCCH set; determining a first offset parameter; determining a search space of the first EPDCCH set according to the first location offset; and according to the first location offset and The first offset parameter determines a search space corresponding to a search space of the second EPDCCH set.
- the method further includes: determining the first offset parameter with reference to the method for determining the first offset parameter in the second aspect.
- a method for determining a control channel search space including: determining a first number of a first EPDCCH set for transmitting an EPDCCH or a second number of a second EPDCCH set; according to the number of the EPDCCH set, Determining a first parameter or a second parameter; determining, according to the first parameter or the second parameter, a location offset of a search space corresponding to the EPDCCH set; determining, according to a location offset of a search space corresponding to the EPDCCH set, The search space corresponding to the EPDCCH set is described.
- the method further includes: determining the first parameter or the second parameter includes: determining the first parameter according to a cell identifier or a UE identifier; or according to a cell identifier or The UE identity determines the second parameter.
- a method for determining a control channel search space including: determining a first number of a first EPDCCH set for transmitting an EPDCCH or a second number of a second EPDCCH set; according to the number of the EPDCCH set, Determining a second offset parameter; determining, according to the second offset parameter, a location offset of a search space corresponding to the EPDCCH set. Determining a search space corresponding to the EPDCCH set according to a location offset of a search space corresponding to the EPDCCH set.
- the method further includes: determining the second offset parameter comprises: determining the second offset parameter according to a cell identifier or a UE identifier.
- a method for determining a control channel search space including: The information in the control information, or the physical random access channel preamble identifier, or the information in the random access response grant, or the information in the message 3 for random access, determines the location offset of the search space corresponding to the EPDCCH set.
- an apparatus for determining a control channel search space including: a number determining unit, configured to determine a number of an EPDCCH set used to transmit at least two groups of an enhanced physical downlink control channel EPDCCH; an offset determining unit, Determining, according to the number of the EPDCCH set, a location offset of the search space corresponding to the EPDCCH set; the search space determining unit, configured to determine, according to the location offset of the search space corresponding to the EPDCCH set, the EPDCCH set corresponding to Search space.
- the apparatus further includes: the number determining unit, specifically, configured to: determine a first number of a first EPDCCH set for transmitting an EPDCCH, and use to transmit an EPDCCH. The second number of the second EPDCCH set.
- the first possible implementation manner of the seventh aspect or the seventh aspect is implemented as follows: the offset determining unit includes: a first offset determining subunit, configured to: Determining, by the first number, a first location offset of a search space corresponding to the first EPDCCH set; and/or a second offset determining subunit, configured to determine the second EPDCCH according to the second number a second position offset of the corresponding search space; and/or a first offset parameter determining unit, configured to determine a first offset parameter; and/or a second offset parameter determining unit, configured to determine the first parameter or The second parameter or the second offset parameter.
- the first possible implementation manner of the seventh aspect or the seventh aspect, or the second possible implementation manner of the seventh aspect is specifically implemented as: And determining, according to the first location offset, a search space corresponding to the first EPDCCH set; or determining, according to the second location offset, a search space corresponding to the second EPDCCH set; or according to the first Position offset, determining a search space corresponding to the second EPDCCH set.
- the second possible implementation manner of the seventh aspect or the seventh aspect is specifically implemented as: the offset determining unit is specifically configured to: determine a first offset position; a first offset parameter; determining the second position offset based on the first offset parameter and the first position offset.
- the second possible implementation manner of the seventh aspect or the seventh aspect is specifically implemented as: the first offset parameter determining unit is specifically configured to: And determining, by the integer range of less than 65538, the first offset parameter; or determining the first offset parameter according to the cell identifier; or determining the first offset parameter according to the UE identifier.
- the second possible implementation manner of the seventh aspect or the seventh aspect is specifically implemented as follows: the offset determining unit includes: a second offset parameter determining unit, configured to The number of the EPDCCH set determines a first parameter A w or a second parameter) w or a second offset parameter.
- the sixth possible implementation manner of the seventh aspect or the seventh aspect is specifically implemented as follows: the offset determining unit is specifically configured to: according to the first parameter or the second a parameter)), determining a location offset of the search space corresponding to the EPDCCH set; or determining a location offset of the search space corresponding to the EPDCCH set according to the second offset parameter r w .
- the searching space determining unit further includes: a first offset parameter determining unit, configured to: Determining a first offset parameter; a search space determining subunit, configured to determine a search space corresponding to the second EPDCCH set according to the first location offset and the first offset parameter.
- the specific implementation is: the offset determining unit is specifically configured to: according to information in the downlink control information, Or the physical random access channel preamble identifier, or the information in the random access response grant, or the information in the message 3 for random access, determining the location offset of the search space corresponding to the EPDCCH set.
- an apparatus for determining a control channel search space including: a memory, configured to store a number of an EPDCCH set for determining an enhanced physical downlink control channel EPDCCH, and determine, according to the number of the EPDCCH set, a location offset of the search space corresponding to the EPDCCH set, a code required to determine a search space corresponding to the EPDCCH set according to a location offset of the search space corresponding to the EPDCCH set; a processor, configured to execute the memory Code.
- the embodiment of the present invention provides a method and a device for determining a control channel search space, by performing packet numbering on the time-frequency resources of the EPDCCH, and determining different position offsets according to the different EPDCCH search spaces, which can be reduced.
- FIG. 1 is a schematic flowchart of a method for determining a search space according to an embodiment of the present invention
- FIG. 2 is a schematic flowchart of a method for determining a search space according to another embodiment of the present invention
- FIG. 4 is a schematic flowchart of a method for determining a search space according to another embodiment of the present invention
- FIG. 5 is a schematic flowchart of a method for determining a search space according to another embodiment of the present invention
- 6 is a schematic flowchart of a method for determining a search space according to another embodiment of the present invention
- FIG. 7 is a schematic block diagram of a device for determining a search space according to an embodiment of the present invention
- FIG. 8 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention.
- FIG. 9 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention.
- FIG. 10 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention
- FIG. 11 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention.
- GSM Global System of Mobile communication
- CDMA code division multiple access
- WCDMA Wideband Code Division Multiple Access
- General Packet Radio Service General Packet Radio Service
- Long Term Evolution Long Term Evolution
- LTE LTE frequency division duplex
- TDD Time Division Duplex
- Universal Mobile Telecommunication System Universal Mobile Telecommunication System
- UMTS Universal Mobile Telecommunication System
- a user equipment may be referred to as a terminal (Terminal), a mobile station (Mobile Station, referred to as “MS”), a mobile terminal ( Mobile Terminal), etc.
- the user equipment can communicate with one or more core networks via a Radio Access Network (“RAN"), for example, the user equipment can be a mobile phone (or “cellular” “Telephone", a computer with a mobile terminal, etc., for example, the user device can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.
- RAN Radio Access Network
- the base station may be a base station (Base Transceiver Station, called “BTS”) in GSM or CDMA, or may be a base station (NodeB, called “NB”) in WCDMA, or may be
- BTS Base Transceiver Station
- NodeB NodeB
- eNB or e-NodeB The evolved base station (Evolutional Node B, referred to as "eNB or e-NodeB") in LTE is not limited in the present invention.
- eNB evolved Node B
- the control channel may include other physical layer control channels, such as a PDCCH and an EPDCCH.
- the EPDCCH set according to the present invention is a set of physical resources configured to support an EPDCCH transmission eNB for a specific UE.
- the cell identifier of the present invention includes a physical cell identifier or a virtual cell identifier, and the physical cell identifier UE is obtained through the synchronization channel, and the virtual cell identifier UE acquires the radio resource control RRC information configured by the eNB.
- the search space of the present invention includes a UE-specific search space or a common search space.
- FIG. 1 is a schematic flowchart of a method for determining a search space according to an embodiment of the present invention.
- the method of Figure 1 can be performed by a base station or UE.
- the 101 Determine a number of an EPDCCH set used to transmit at least two groups of the EPDCCH.
- Two or more time-frequency resources are allocated for the EPDCCH of the user-level search space, and one set of time-frequency resources is called an EPDCCH set.
- Each EPDCCH set corresponds to the number of one EPDCCH set, and the number of the EPDCCH set corresponding to each EPDCCH set is different.
- the EPDCCH set is numbered c, and c is a non-negative integer smaller than N, where N is configured for the UE.
- the number of EPDCCH sets of the search space It should be understood that the number is not limited to a number and may be any symbol, character, information, or the like that has an identification effect.
- the embodiment of the present invention determines the probability of the control channel search space collision by grouping the time-frequency resources of the EPDCCH and determining different position offsets according to different EPDCCH search spaces.
- the location offset of the search space corresponding to the first EPDCCH set may be determined according to the number of the first EPDCCH set, and the second EPDCCH set may be determined according to the number of the second EPDCCH set.
- the position offset of the corresponding search space may be determined, and the location offset of the search space corresponding to the second EPDCCH set may be determined according to the number of the first EPDCCH set, and the two EPDCCH sets may be simultaneously determined according to the numbers of the two EPDCCH sets.
- the position offset of the search space may be determined according to the number of the first EPDCCH set, and the second EPDCCH set may be determined according to the number of the second EPDCCH set.
- n RNT1 is the identity of the UE
- n s is the slot number.
- the location offset of the search space corresponding to the first EPDCCH set may be determined, and then the second EPDCCH set corresponding to the location offset of the search space corresponding to the first EPDCCH set may be determined by determining an intermediate variable.
- the location of the search space is offset.
- the quantity in the above formula is changed or a new variable is given to the above formula to simultaneously determine the positional offset of the search space corresponding to the two EPDCCH sets.
- step 103 the search corresponding to the EPDCCH set is empty.
- L is the Aggregation Level
- the above two steps can be performed separately or simultaneously, and the order is not limited.
- An intermediate variable may also be determined, and the location offset of the search space corresponding to the second EPDCCH set is directly determined according to the intermediate variable and the positional offset of the search space corresponding to the first EPDCCH set.
- the method for determining a control channel search space is determined by grouping the time-frequency resources of the EPDCCH, and determining different position offsets according to the different EPDCCH search spaces, which can effectively reduce the control channel search space conflict. probability. Therefore, it is possible to maximize the utilization of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 2 is a schematic flowchart of a method for determining a search space according to still another embodiment of the present invention.
- the method of Figure 1 can be performed by a base station or UE.
- 2 is a more specific embodiment of FIG. 1, showing a specific method of determining the position offset of the EPDCCH set, and a specific method of determining the search space according to the position offset.
- Two or more time-frequency resources are allocated for the EPDCCH of the user-level search space, and one set of time-frequency resources is called an EPDCCH set.
- Each EPDCCH set corresponds to the number of one EPDCCH set, and the number of the EPDCCH set corresponding to each EPDCCH set is different.
- the EPDCCH set is numbered c, and c is a non-negative integer smaller than N, where N is configured for the UE.
- the number of EPDCCH sets of the search space It should be understood that the number is not limited to a number and may be any symbol, character, information, or the like that has an identification function.
- two EPDCCH sets are taken as an example, the number of the first EPDCCH set is 0, and the number of the second EPDCCH set is 1.
- the first positional offset i can be derived from the following formula:
- the first parameter is V, and V may be determined by any one of the following methods: V is a fixed value; or, determining a first offset parameter according to the cell identifier; or determining a first offset parameter according to the UE identifier.
- the first offset parameter is a fixed value and can be assigned a V-predefined value.
- the predefined value is an integer greater than 0 and less than 65538.
- the fixed value can then be selected from the range by a random or specified method. For example: The fixed value is 39827.
- a first offset parameter that is, a cell-specific mode, according to the cell identifier, where the Cell-specific includes at least one of the following methods:
- the eCCE is an enhanced control channel unit, and the number of eCCEs is determined by an aggregation level of the time-frequency resource and the EPDCCH allocated by the EPDCCH set;
- the UE-specific includes at least one of the following methods:
- A is a prime number
- the eCCE is an enhanced control channel element
- the number of eCCEs is allocated by the EPDCCH set
- the time-frequency resource and the aggregation level of the EPDCCH are determined;
- the second position offset can be determined by any of the following methods:
- V ( ⁇ + v ) modN ⁇ £ , where i is the kth sub- The first position offset of the frame, i is a second position offset of the kth subframe, V is the first offset parameter, and CC is the number of eCCEs in the second EPDCCH set;
- V (F + v) mod N PS5 , where i is The first position offset of the kth subframe, i is the second position offset of the kth subframe, and V is the first offset parameter, which is a physical layer resource block in the second EPDCCH set Number of pairs;
- V (i + v) mod eCC £
- i (i + v) mod eCC £
- V the first offset parameter
- M ⁇ C£ is a physical layer resource block pair
- D 65537
- L s / 2
- n R is the identifier of the UE, which is the slot number.
- L is the Aggregation Level and i is the second position offset.
- m' m
- the method for determining the control channel search space in the embodiment of the present invention is to perform packet numbering on the EPDCCH time-frequency resource according to the number, different cell identifier, UE identifier, different EPDCCH resource allocation mode, and transmission mode.
- Different EPDCCH search spaces determine different position offsets, which can effectively reduce the probability of control channel search space collisions. Therefore, it is possible to maximize the use of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 3 is a schematic flowchart of a method for determining a search space according to still another embodiment of the present invention.
- the method of Figure 3 can be performed by a base station or UE.
- 3 is another embodiment of FIG. 1.
- FIG. 3 is compared with FIG. 2, and the difference is in the method for determining the search space.
- the first position offset and the first The offset parameter directly determines the second search space.
- This step is a case in the foregoing step 201, that is, the first position offset of the search space corresponding to the first EPDCCH set is separately determined.
- the specific determination method has been described in step 201 and will not be described again.
- step 202 For the specific determination method, refer to step 202, and details are not described herein.
- the search space of the second EPDCCH set is directly determined according to the first location offset and the first offset parameter, thereby skipping the determining process of the second location offset parameter.
- the method for determining the control channel search space in the embodiment of the present invention is to perform packet numbering on the EPDCCH time-frequency resource according to the number, different cell identifier, UE identifier, different EPDCCH resource allocation mode, and transmission mode.
- Different EPDCCH search spaces determine different position offsets, which can effectively reduce the probability of control channel search space collisions. Therefore, it is possible to maximize the use of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 4 is a schematic flowchart of a method for determining a search space according to still another embodiment of the present invention.
- the method of Figure 4 can be performed by a base station or UE.
- 4 is a more specific embodiment of FIG. 1, which determines the position offset of the EPDCCH set simultaneously by determining intermediate parameters.
- the value of the first parameter A (c) can be determined by any of the following ways:
- the value of the second parameter D (c) can be determined by any of the following ways:
- c is the number of the EPDCCH set
- i is the position offset of the search space corresponding to the EPDCCH set numbered c in the kth subframe
- F— for the UE ID, is the slot number.
- step 205 For the determination method, refer to step 205, and details are not described herein.
- the method for determining a control channel search space in the embodiment of the present invention determines a different location offset for different EPDCCH search spaces according to the number and different cell identifiers and UE identifiers by performing packet numbering on the time-frequency resources of the EPDCCH. Move, can effectively reduce the control letter The probability of a track search space conflict. Therefore, it is possible to maximize the utilization of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 5 is a schematic flowchart of a method for determining a search space according to still another embodiment of the present invention.
- the method of Figure 5 can be performed by a base station or UE.
- FIG. 5 is a more specific embodiment of FIG. 1.
- the method for using the intermediate parameter is different from that in FIG. 4 by determining the intermediate parameter to determine the position offset of the EPDCCH set at the same time.
- the value of the second offset parameter can be determined in any of the following ways:
- c is the number of the EPDCCH set, and i) is the position offset of the search space corresponding to the EPDCCH set numbered c in the kth subframe;
- step 205 For the determination method, refer to step 205, and details are not described herein.
- the method for determining a control channel search space in the embodiment of the present invention determines a different location offset for different EPDCCH search spaces according to the number and different cell identifiers and UE identifiers by performing packet numbering on the time-frequency resources of the EPDCCH. Move, can effectively reduce the control letter The probability of a track search space conflict. Therefore, it is possible to maximize the utilization of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 6 is a schematic flowchart of a method for determining a search space according to still another embodiment of the present invention.
- the method of Figure 6 can be performed by a base station or UE.
- Figure 6 is a more specific embodiment of Figure 1.
- step 101 For the determination method, refer to step 101, and no further description is provided.
- This embodiment is directed to the common search space, and the location of the common search space is determined by any explicit or implicit message in message 0 or message 1 or message 2 or message 3 in the physical random access channel PRACH process. Offset. Specifically, the following manners can be used: By using message 0, that is, DCI format 1A, any bit in DCI format 1A can be used to indicate the location offset of the UE in the common search space;
- the message 1, the PRACH preamble index, is used to determine which position offset.
- the odd number corresponds to a position offset of the search space
- the even number corresponds to another position offset of the search space
- Determining the location offset of the common search space of the UE by adding a location offset indication bit of the common search space by using a message 2, that is, a random access response grant (Right Access Response Grant);
- the location offset indication request bit of the common search space is added to the information sent by the UE to the eNB to determine the location offset of the common search space of the UE.
- the location offset of the UE in the common search space is determined by the radio network temporary identifier RNTI of the UE, for example, the odd RNTI corresponds to a location offset of the search space, and the even RNTI corresponds to another location offset of the search space.
- the RNTI described herein includes not limited to a cell radio network temporary identifier (C-RNTI), a random access radio network temporary identifier (RA-RNTI), a temporary cell radio network temporary identifier (Temporary C-RNTI), and the like.
- the method for determining the control channel search space in the embodiment of the present invention is to perform packet numbering on the EPDCCH time-frequency resource according to the number, different cell identifier, UE identifier, different EPDCCH resource allocation mode, and transmission mode.
- Different EPDCCH search spaces determine different position offsets, which can effectively reduce the probability of control channel search space collisions. Therefore, it is possible to maximize the utilization of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 7 is a schematic block diagram of a device for determining a search space according to an embodiment of the present invention.
- the present embodiment provides a device 700, which may specifically perform the steps of the foregoing embodiment in FIG. 1 , and details are not described herein again.
- the apparatus 700 provided in this embodiment may specifically include a number determining unit 701, an offset determining unit 702, and a search space determining unit 703.
- the number determining unit 701 is configured to determine a number of an EPDCCH set used to transmit at least two groups of the enhanced physical downlink control channel EPDCCH.
- the offset determining unit 702 is configured to determine, according to the number of the EPDCCH set, a location offset of a search space corresponding to the EPDCCH set.
- the search space determining unit 703 is configured to determine, according to the location offset of the search space corresponding to the EPDCCH set, a search space corresponding to the EPDCCH set.
- FIG. 8 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention.
- the present embodiment provides a device 800, which can specifically perform the steps of the foregoing embodiment in FIG. 2, and details are not described herein again.
- the apparatus 800 provided in this embodiment may specifically include a number determining unit 701, an offset determining unit 802, and a search space determining unit 803.
- the offset determining unit 802 includes a first offset determining subunit 812, configured to determine, according to the first number, a first location offset of a search space corresponding to the first EPDCCH set; and a second offset determining subunit 832, configured to determine, according to the second number, a second location offset of the search space corresponding to the second EPDCCH set, and a first offset parameter determining unit 822, configured to determine a first offset parameter, specifically determining
- the method has been explained in step 203 of the embodiment in FIG. 2 above, and details are not described herein again.
- the first offset parameter determining unit 822 may be included in the second offset determining subunit 832 or may be a subunit independent of the second offset determining subunit 832.
- the search space determining unit 803 is configured to determine, according to the first location offset, a search space corresponding to the first EPDCCH set, and determine, according to the second location offset, a search space corresponding to the second EPDCCH set.
- FIG. 9 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention.
- the present embodiment provides an apparatus 900, which may specifically perform the steps in the foregoing embodiment of FIG. 3, and details are not described herein again.
- the apparatus 900 provided in this embodiment may specifically include a number determining unit 701, an offset determining unit 902, and a search space determining unit 903.
- the offset determining unit 902 includes a first offset determining sub-unit 912, configured to determine, according to the first number, a first location offset of a search space corresponding to the first EPDCCH set; the search space determining unit 903 includes The first offset parameter determining unit 913 and the search space determining sub-unit 923.
- the first offset parameter determining unit 913 is configured to determine the first offset parameter.
- the specific determining method is described in step 203 in the foregoing Embodiment 2, and details are not described herein again.
- the search space determining sub-unit 923 is configured to determine, according to the first location offset and the first offset parameter, a search space corresponding to the second EPDCCH set.
- FIG. 10 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention.
- the present embodiment provides an apparatus 1000, which may specifically perform the steps of the foregoing embodiment in FIG. 3 or FIG. 4, and details are not described herein again.
- the apparatus 1000 provided in this embodiment may specifically include a number determining unit 701, an offset determining unit 1002, and a search space determining unit 1003.
- the offset determining unit 1002 includes a second offset parameter determining unit 1012, a first offset determining subunit 1022, and a second offset determining subunit 1023.
- the second offset parameter determining unit 1012 is configured to determine, according to the number of the EPDCCH set, a first parameter) or a second parameter) w or a second offset parameter, where the specific determining method is in the foregoing embodiment of FIG. 4 Step 401 is set forth in step 501 of the embodiment in FIG. 5, and details are not described herein again.
- the search space determining unit 1003 is configured to determine, according to the first location offset, a search space corresponding to the first EPDCCH set, and determine, according to the second location offset, a search space corresponding to the second EPDCCH set.
- the apparatus for determining the control channel search space in the embodiment of the present invention performs packet numbering on the time-frequency resources of the EPDCCH, according to the number, different cell identifiers, UE identifiers, different EPDCCH resource allocation modes, and transmission modes.
- Different EPDCCH search spaces determine different position offsets, which can effectively reduce the probability of control channel search space collisions. Therefore, it is possible to maximize the use of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- FIG. 11 is a schematic block diagram of a device for determining a search space according to another embodiment of the present invention. As shown in FIG. 11 , this embodiment provides an apparatus 1100, which may specifically perform the steps of any of the foregoing embodiments, and details are not described herein again.
- the apparatus 1100 provided in this embodiment may specifically include a memory 1101. And processor 1102.
- the memory 1101 may be configured to store a number of an EPDCCH set for determining an enhanced physical downlink control channel (EPDCCH), and determine a location offset of a search space corresponding to the EPDCCH set according to the number of the EPDCCH set, according to the EPDCCH set. A location offset of the corresponding search space, and a code required to determine a search space corresponding to the EPDCCH set.
- EPDCCH enhanced physical downlink control channel
- the memory 1101 may be further configured to store a number of the EPDCCH set, a first offset parameter, a second offset parameter, a first parameter, a second parameter, a location offset of a search space corresponding to the EPDCCH set, and a search space corresponding to the EPDCCH set.
- the processor performs storage of data to be processed and data to be output and buffering of intermediate data.
- the memory 1101 can be either a memory independent of the processor 1102 or a buffer included in the processor 1102.
- the processor 1102 is configured to execute the code in the memory 1101. Therefore, the number of the EPDCCH set for transmitting the enhanced physical downlink control channel (EPDCCH) is determined, and the location offset of the search space corresponding to the EPDCCH set is determined according to the number of the EPDCCH set, and the search is performed according to the EPDCCH set. A position offset of the space, determining a search space corresponding to the EPDCCH set.
- EPDCCH enhanced physical downlink control channel
- the processor 1102 is further configured to determine a first offset parameter, a second offset parameter, a first parameter, and a second parameter.
- a first offset parameter refers to step 203 in the foregoing embodiment of FIG. 2.
- the method for determining the second offset parameter may refer to step 501 in the foregoing embodiment of FIG. 5, and the method for determining the first parameter and the second parameter. Reference may be made to step 401 in the above embodiment of Fig. 4.
- the apparatus for determining the control channel search space in the embodiment of the present invention performs packet numbering on the time-frequency resources of the EPDCCH, according to the number, different cell identifiers, UE identifiers, different EPDCCH resource allocation modes, and transmission modes.
- Different EPDCCH search spaces determine different position offsets, which can effectively reduce the probability of control channel search space collisions. Therefore, it is possible to maximize the use of the control channel time-frequency resources in a multi-user situation and improve communication efficiency.
- the disclosed systems, devices, and methods may be implemented in other ways.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
- the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
- the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
- a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
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Abstract
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MX2015005456A MX362087B (es) | 2012-11-01 | 2012-11-01 | Método y aparato para determinar espacio de búsqueda del canal de control. |
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ES17163472T ES2747783T3 (es) | 2012-11-01 | 2012-11-01 | Procedimiento y aparato para determinar un espacio de búsqueda de canal de control |
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EP12887441.9A EP2911456B1 (en) | 2012-11-01 | 2012-11-01 | Method and device for determining search space of control channel |
BR112015009760-0A BR112015009760B1 (pt) | 2012-11-01 | 2012-11-01 | Método e aparelho para determinar espaço de busca de canal de controle |
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RU2015120282/08A RU2605036C1 (ru) | 2012-11-01 | 2012-11-01 | Способ и устройство определения пространства поиска канала управления |
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EP17163472.8A EP3267733B1 (en) | 2012-11-01 | 2012-11-01 | Method and apparatus for determining control channel search space |
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US16/387,137 US10750497B2 (en) | 2012-11-01 | 2019-04-17 | Method and apparatus for determining control channel search space |
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US11382085B2 (en) | 2017-11-10 | 2022-07-05 | Huawei Technologies Co., Ltd. | Search space determining method and wireless apparatus |
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