CN101945403B - A kind of method and apparatus determining the proprietary search volume of user - Google Patents

A kind of method and apparatus determining the proprietary search volume of user Download PDF

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CN101945403B
CN101945403B CN201010251917.0A CN201010251917A CN101945403B CN 101945403 B CN101945403 B CN 101945403B CN 201010251917 A CN201010251917 A CN 201010251917A CN 101945403 B CN101945403 B CN 101945403B
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user
carrier
component carriers
specific search
search space
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CN101945403A (en
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吴欣
戴博
左志松
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ZTE Corp
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ZTE Corp
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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
    • 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
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a kind of method and apparatus determining the proprietary search volume of user, the method comprises: under carrier aggregation scene, when enable across carrier dispatching, determine the position of the proprietary search volume of the user of each component carrier under each polymerization grade, the relative same position equal increments of original position of the proprietary search volume of user of each component carrier.Adopt technical scheme of the present invention, Release be solved? across the Downlink Control Information test problems in the enable situation of carrier dispatching in 10 versions.

Description

Method and device for determining user-specific search space
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for determining a search space specific to a user.
Background
A radio frame (radioframe) in a Long Term Evolution (LTE) system includes frame structures of a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode. In the frame structure of the FDD mode, as shown in fig. 1, a 10 millisecond (ms) radio frame is composed of twenty slots (slots) with the length of 0.5ms and the number of 0-19, and the slots 2i and 2i +1 constitute a subframe (subframe) i with the length of 1 ms. In the TDD mode, as shown in fig. 2, a 10ms radio frame is composed of two half-frames (half-frames) with a length of 5ms, one half-frame includes 5 subframes with a length of 1ms, and subframe i is defined as 2 slots 2i and 2i +1 with a length of 0.5 ms. In the above two frame structures, for a standard cyclic prefix (NormalCP), one slot contains 7 symbols with a length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21us, and the CP length of the remaining 6 symbols is 4.69 us; for an extended cyclic prefix (ExtendedCP, ExtendedCyclicPrefix), one slot contains 6 symbols, and the CP length of all symbols is 16.67 us.
The version number of LTE corresponds to R8(Release8), the version number corresponding to the added version is R9(Release9), and the version number of LTE-Advance in the future is R10(Release 10). The following three downlink physical control channels are defined in LTE: a physical downlink control format indicator channel (PCFICH); a physical hybrid automatic repeat request indicator channel (PHICH); a Physical Downlink Control Channel (PDCCH).
The information carried by the PCFICH is used to indicate the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols for transmitting the PDCCH in one subframe, and is sent on the first OFDM symbol of the subframe, and the frequency position of the first OFDM symbol is determined by the system downlink bandwidth and the cell Identity (ID).
The PHICH is used to carry acknowledgement/negative-acknowledgement (ACK/NACK) feedback information of uplink transmission data. The number and time-frequency position of the PHICH may be determined by a system message and a cell ID in a Physical Broadcast Channel (PBCH) of a downlink carrier where the PHICH is located.
The PDCCH is used for carrying Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information. The format of DCI (DCIformat) is classified into the following: DCIformat0, DCIformat1, DCIformat1A, DCIformat1B, DCIformat1C, DCIformat1D, DCIformat2, DCIformat2A, DCIformat3, and DCIformat3A, and the like; wherein:
DCIformat0 is used to indicate scheduling of a Physical Uplink Shared Channel (PUSCH);
DCIformat1, DCIformat1A, DCIformat1B, DCIformat1C, DCIformat1D are used for different modes of one PDSCH codeword scheduling;
DCIformat2, DCIformat2A, DCIformat2B are used for different modes of spatial multiplexing;
DCIformat3 and DCIformat3A are used for different modes of power control commands for a Physical Uplink Control Channel (PUCCH) and a PUSCH.
Physical resources transmitted by a physical downlink control channel PDCCH are in units of Control Channel Elements (CCEs), the size of one CCE is 9 Resource Element Groups (REGs), that is, 36 resource elements (resourceelements), and one PDCCH may occupy 1, 2, 4, or 8 CCEs. For the four PDCCH sizes occupying 1, 2, 4, 8 CCEs, tree-like aggregation (aggregation) is adopted, i.e. the PDCCH occupying 1 CCE may start from any CCE location; the PDCCH occupying 2 CCEs starts from an even CCE location; a PDCCH occupying 4 CCEs starts from an integer multiple of 4 CCE locations; PDCCHs occupying 8 CCEs start from CCE locations that are integer multiples of 8.
Each aggregation level (aggregation level) defines a search space (Searchspace) comprising a common (common) search space and a User Equipment (UE) Specific (UE-Specific) search space. The CCE number of the whole search space is determined by the number of OFDM symbols occupied by the control region indicated by the PCFICH in each downlink subframe and the number of PHICH groups. And the UE performs blind detection on all possible PDCCH code rates in the search space according to the DCIformat of the transmission mode.
In the k sub-frame, the control domain carrying PDCCH is numbered from a group of numbers 0 to NCCE，kN of-1CCE，kUE should detect a group of candidate PDCCHs in each non-DRX (non-discontinuous reception) subframe to acquire control information, wherein the detection means that the PDCCHs in the group are decoded according to all DCIformat to be detected, the candidate PDCCHs (PDCCHcandidate) to be detected are defined in a space searching mode, and aggregation level (aggregation level) L ∈ {1, 2, 4, 8} is searched for a spaceIs defined by a set of pdcch candidates (pdcchcandidate). Search spaceThe CCE corresponding to the pdcch (pdcchcandidate) m candidate is defined by the following equation:
wherein i is 0, L-1, M is 0, …, M(L)-1，M(L)For searching spaceThe number of candidate PDCCHcandidates to be detected in the process.
For common search space (common search space), YkL takes 4 and 8, 0.
For a UE-specific search space (UE-specific search space), L takes 1, 2, 4, 8.
Yk＝(A·Yk-1)modD，
WhereinY-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identity).
The UE should detect one common search space each with an aggregation level of 4 and 8 and one UE-specific search space each with an aggregation level of 1, 2, 4, 8, and the common search space and the UE-specific search space may overlap. The specific detection times and the corresponding search spaces are shown in table 1:
table 1: correspondence between detection times and search space
The UE receives PDSCH data transmissions via a transmission mode (transmissionmode) that is set to be based on one of the following, by a high-layer signaling semi-static (semi-static), as indicated by the PDCCH of a user equipment-Specific (UE-Specific) search space:
mode 1: a single antenna port; port0 (Single-antiport; port0)
Mode 2: transmit diversity (Transmitdiversity)
Mode 3: open-loop spatial multiplexing (Open-loop spatial multiplexing)
Mode 4: closed-loop spatial multiplexing (Closed-loop spatial multiplexing)
Mode 5: multi-user multiple input multiple output (Multi-userMIMO)
Mode 6: closed-loop Rank 1precoding (Closed-loop Rank 1precoding)
Mode 7: a single antenna port; port5 (Single-antiport; port5)
If the UE is set by the higher layer to perform PDCCH decoding with Cyclic Redundancy Check (CRC) scrambled with cell radio network temporary identity (C-RNTI), the UE should decode the PDCCH and all related PDSCHs according to the corresponding combinations defined in table 2:
table 2: transmission scheme corresponding to downlink transmission mode when scrambling C-RNTI (radio network temporary identifier)
If the UE is set by the higher layer to perform PDCCH decoding with CRC scrambled with Semi-persistent scheduling cell radio network temporary identifier (SPSC-RNTI), the UE should decode the PDCCH and all related PDSCHs according to the corresponding combination defined in the following table 3:
table 3: transmission scheme corresponding to downlink transmission mode during scrambling of SPSC-RNTI (shortest Path first-radio network temporary identifier)
If the UE is set by the higher layer to perform PDCCH decoding with CRC scrambled with transmission power control uplink control channel cell radio network temporary identifier (TPC-PUCCH-RNTI), TransmitPowerControl-PUCCH-cellradio network temporary identifier, the UE should decode the PDCCH according to the corresponding combination defined in the following table 4:
table 4: search space corresponding to DCIformat when TPC-PUCCH-RNTI is scrambled
DCI format Search space
DCI format 3/3A Public search spaces
If the UE is set by the higher layer to perform PDCCH decoding with CRC scrambled with transmission power control uplink shared channel cell radio network temporary identifier (TPC-PUSCH-RNTI, TransmitPowerControl-PUSCH-cellradio network temporary identifier), the UE should decode the PDCCH according to the corresponding combination defined in the following table 5:
table 5: search space corresponding to DCIformat when TPC-PUSCH-RNTI is scrambled
DCI format Search space
DCI format 3/3A Public search spaces
Since the LTE-Advanced network needs to be able to access LTE users, its operating band needs to cover the current LTE band, and there is no distributable continuous 100MHz spectrum bandwidth on this band, so a direct technology that the LTE-Advanced needs to solve is to aggregate several continuous component carrier frequencies (spectrums) distributed on different bands by carrier aggregation (carrieragrargetion) technology to form the 100MHz bandwidth that the LTE-Advanced can use. I.e. for the aggregated spectrum, is divided into n component carrier frequencies (spectra), the spectrum within each component carrier frequency (spectrum) being continuous.
In a carrier aggregation scenario, the 3GPP may schedule a plurality of component carriers in a cross component carrier scheduling (cross component carrier scheduling), that is, may monitor downlink control channels PDCCH of other component carriers on a certain component carrier. Then, a Carrier Indicator Field (CIF) needs to be added to a downlink control information format (dcifomat) to determine which component carrier PDCCH the monitored PDCCH is.
In the process of cross-carrier scheduling, the design scheme of the original R8 version user-specific search space no longer meets the requirement of LTE-Advanced Release (R) 10. Currently, there is no established solution for how to design the user-specific search space in R10, thereby causing inconvenience to practical applications.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a device for determining a user-specific search space, which can solve the downlink control information detection problem under the cross-carrier scheduling enabling condition in Release10 version.
A method of determining a user-specific search space, comprising:
in a carrier aggregation scene, when cross-carrier scheduling is enabled, determining the position of the user-specific search space of each component carrier under each aggregation level, wherein the initial position of the user-specific search space of each component carrier is increased in an equal amount relative to the same position.
Further, the user-specific search spaces of the component carriers are uniformly distributed over the entire search space at maximum intervals.
Further, the relative position between the starting positions of the user-specific search spaces indexing adjacent component carriers is fixed and does not vary with the number of control channel elements, CCEs.
Further, the CCE corresponding to the candidate physical downlink control channel in the user-specific search space is defined as:
wherein i is 0, L-1, M is 0, …, M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)In order to search the number of candidate physical downlink control channels to be detected in the space under the condition of aggregation level L, k is the subframe number, and N isCCE，kThe number of CCEs in the subframe k, and I is the carrier index of each component carrier;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE.
Further, the uniform distribution of the user-specific search spaces of the component carriers over the entire search space according to the maximum interval means:
said f (I) ═ M(L)·I+g(I)；
The above-mentioned
Or
Or
Wherein,the expression is rounded downwards, | | represents the absolute value, and the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, which is any integer value from 2 to 8, or is configured by higher layer signaling.
Further, the uniform distribution of the user-specific search spaces of the component carriers over the entire search space according to the maximum interval means:
said f (I) is:
or,
wherein,expressing rounding down, the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, and the fixed value is any integer value from 2 to 8, or is configured by higher layer signaling.
Further, the relative position between the starting positions of the user-specific search spaces indexing the adjacent component carriers is fixed means that:
(i) W · g (i);
wherein, the values of W are as follows:n is a multiple of L; or W ═ M(L)(ii) a Or W is a fixed integer value;
the definition of g (I) is:
g (I) H · I, H taking any integer value from 1 to 8, alternatively from 1 to 1Any integer value of (a);
or g (I) ═ (H · I) modQ, where H and Q take any integer value from 1 to 8, or from 1 to 8Any integer value of (2).
Further, when the L takes different values, the values of the N are the same.
Further, a function e (Y) in the user-specific search spacek) There are two expression modes as follows:
e(Yk)＝Ykeither the first or the second substrate is, alternatively,
further, the index of the component carrier is configured in any one of the following ways:
(1) setting the component carrier index of the component carrier implementing cross carrier scheduling as a specified value, and sequentially configuring the component carrier indexes of the rest component carriers scheduled by the cross carrier according to the frequency point positions of the component carriers and the specified value;
(2) setting the component carrier indexes of the component carriers implementing cross carrier scheduling as a specified value, arranging all the component carriers according to the high-low sequence of respective frequency points, starting from the component carriers implementing cross carrier scheduling according to the arrangement sequence, and circularly allocating the component carrier indexes of other component carriers next to the specified value;
(3) continuously configuring component carrier indexes for each component carrier which implements cross-carrier scheduling and is subjected to cross-carrier scheduling according to respective frequency point positions in a high-low sequence;
(4) the component carrier index is equal to the value of the carrier indication field of the component carrier;
(5) configuring component carrier indexes according to carrier indication domains of all component carriers configured to user equipment by a base station and the total number of the activated component carriers, and continuously allocating the component carrier indexes to the activated component carriers from 0 according to the sequence of carrier indication domain values, wherein the sequence is from small to large or from large to small;
(6) the component carrier index is configured by a higher layer signaling configuration.
The invention also provides a device for determining the special search space of the user, which comprises a setting module;
the setting module is used for determining the position of the user-specific search space of each component carrier in each aggregation level when cross-carrier scheduling is enabled in a carrier aggregation scene; the starting position of the user-specific search space for each component carrier is incremented by an equal amount relative to the same position.
Further, the user-specific search spaces of the component carriers set by the setting module are uniformly distributed over the entire search space at maximum intervals.
Further, the relative position between the starting positions of the user-specific search spaces of the component carriers adjacent to the index set by the setting module is fixed and does not vary with the number of control channel elements CCE.
Further, the setting module sets the CCE corresponding to the candidate physical downlink control channel in the user-specific search space in the following manner:
wherein i is 0, L-1, M is 0, …, M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)In order to search the number of candidate physical downlink control channels to be detected in the space under the condition of aggregation level L, k is the subframe number, and N isCCE，kThe number of CCEs in the subframe k, and I is the carrier index of each component carrier;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE.
Further, the uniform distribution of the user-specific search spaces of the component carriers set by the setting module over the entire search space according to the maximum interval means:
said f (I) ═ M(L)·I+g(I)；
The above-mentioned
Or
Or
Wherein,the expression is rounded downwards, | | represents the absolute value, and the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, which is any integer value from 2 to 8, or is configured by higher layer signaling.
Further, the uniform distribution of the user-specific search spaces of the component carriers set by the setting module over the entire search space according to the maximum interval means:
said f (I) is:
or,
wherein,expressing rounding down, the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, and the fixed value is any integer value from 2 to 8, or is configured by higher layer signaling.
Further, the relative position between the starting positions of the user-specific search spaces indexing adjacent component carriers set by the setting module being fixed means that:
(i) W · g (i);
wherein, the values of W are as follows:n is a multiple of L; or W ═ M(L)(ii) a Or W is a fixed integer value;
the definition of g (I) is:
g (I) H · I, H taking any integer value from 1 to 8, alternatively from 1 to 1Any integer value of (a);
or g (I) ═ (H · I) modQ, where H and Q take any integer value from 1 to 8, or from 1 to 8Any integer value of (2).
Further, when the L takes different values, the values of the N are the same.
Further, a function e (Y) in the user-specific search spacek) There are two expression modes as follows:
e(Yk)＝Ykeither the first or the second substrate is, alternatively,
in summary, the present invention provides a method and an apparatus for determining a user-specific search space, which solve the problem of a blocking rate between users in a scenario by defining a PDCCH user-specific search space for monitoring each component carrier when cross-carrier scheduling is enabled in a carrier aggregation scenario of R10 version.
Drawings
Fig. 1 is a diagram illustrating a frame structure of an FDD mode in the prior art;
FIG. 2 is a diagram illustrating a frame structure of a TDD mode in the prior art;
fig. 3 is a schematic diagram of starting positions of aggregation levels of a user-specific search space under carrier aggregation;
fig. 4 is a schematic diagram of a new user-specific search space for carrier aggregation;
fig. 5 is a schematic diagram of a new user-specific search space for carrier aggregation;
fig. 6 is a schematic diagram of the starting positions of the aggregation levels of the next user-specific search space for carrier aggregation.
Detailed Description
The method and the device for detecting the downlink control information are used for managing the monitoring of the PDCCH in a carrier aggregation system.
Device embodiment
The embodiment provides a device for determining a user-specific search space, which comprises a setting module;
the device comprises a setting module, a searching module and a searching module, wherein the setting module is used for determining the position of a user-specific search space of each component carrier in each aggregation level when cross-carrier scheduling is enabled in a carrier aggregation scene; the starting position of the user-specific search space for each component carrier is incremented by an equal amount relative to the same position.
The user-specific search spaces of the component carriers set by the setting module are uniformly distributed on the whole search space according to the maximum interval.
The relative position between the initial positions of the user-specific search spaces of the component carriers adjacent to the index set by the setting module is fixed and does not change with the number of CCEs.
The setting module sets CCE corresponding to the candidate physical downlink control channel in the user special search space according to the following mode:
wherein i ═0，...，L-1，m＝0，…，M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)In order to search the number of candidate physical downlink control channels to be detected in the space under the condition of aggregation level L, k is the subframe number, and N isCCE，kThe number of CCEs in the subframe k, and I is the carrier index of each component carrier;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE.
The setting module sets the user-specific search spaces of the component carriers to be uniformly distributed in the whole search space according to the maximum interval, namely:
f(I)＝M(L)·I+g(I)；
or
Or
The setting module sets the user-specific search spaces of the component carriers to be uniformly distributed in the whole search space according to the maximum interval, namely:
said f (I) is:
or,
wherein,the expression is rounded downwards, | | represents the absolute value, and the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, which is any integer value from 2 to 8, or is configured by higher layer signaling.
The relative position between the starting positions of the user-specific search spaces of the index-adjacent component carriers set by the setting module is fixed, which means that:
f(I)＝W·g(I)；
wherein, the values of W are as follows:n is a multiple of L; when L takes different values, N may be the same or different, preferably, when L takes different values, N takes the same value, for example, when L is 1, 2, 4 or 8, N all takes 16;
or W ═ M(L)(ii) a Or W is a fixed integer value;
the definition of g (I) is:
g (I) H · I, H taking any integer value from 1 to 8, alternatively from 1 to 1Any integer value of (a);
or g (I) ═ (H · I) modQ, where H and Q take any integer value from 1 to 8, or from 1 to 8Any integer value of (2).
Function e (Y) in user-specific search spacek) There are two expression modes as follows:
e(Yk)＝Ykeither the first or the second substrate is, alternatively,
method embodiment
In a carrier aggregation scenario, when cross-carrier scheduling is enabled, the method determines the positions of the user-specific search spaces of the component carriers in each aggregation level, and starting positions of the user-specific search spaces of the component carriers are increased in an equal amount relative to the same position.
The first embodiment is as follows:
in an LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, the starting position of the user-specific search space monitored by the PDCCH under each aggregation level may be determined according to the radio network temporary identifier and the aggregation level of the user equipment. As shown in the schematic diagram 3, the specific configuration is as follows:
in the k-th subframe, the control domain carrying PDCCH is formed by a group of numbers0 to NCCE，kN of-1CCE，kAggregation level (aggregation level) L ∈ {1, 2, 4, 8}, UE-specific search spaceIs defined by a set of pdcch candidates (pdcchcandidate). UE-specific search spacesThe starting position of the CCE corresponding to the first pdcch candidate (pdcchcandidate) is defined by the following equation:
wherein, Yk＝(A·Yk-1)modD，Y-1＝nRNTI≠0，A＝39827，D＝65537， Denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identifier).
In the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1, 2, 3, 4} or {0, 1, 2, 3, 4, 5, 6, 7 }. The definition of the user-specific search space monitored by the PDCCH can have the following configurations:
configuring a first step:
the user-specific search spaces for each component carrier are uniformly distributed over the entire search space at maximum intervals. The UE-specific search space at a certain aggregation level is shown in diagram 4.
UE-specific search spacesThe CCE corresponding to the pdcch (pdcchcandidate) m candidate is defined by the following equation:
wherein, e (Y)k)＝Yk，i＝0，...，L-1，m＝0，…，M(L)-1，M(L)For searching spaceNumber of candidate PDCCHs to be examined, NCCE，kThe number of CCEs carrying the PDCCH control field for the k-th subframe, f (I) is a function of the component carrier index I as input. And f (I) can be defined by the following method:
f(I)＝M(L)·I+g(I)
wherein g (i) may be represented by the following method:
or
Or
Alternatively, f (i) may be defined as follows:
or
Here, the NumCC may be the number of component carriers configured to the user, the number of active component carriers configured to the user, the maximum number of component carriers of the current system, or a fixed value, where the fixed value may be any integer value from 2 to 8, or configured by higher layer signaling.Indicating rounding down, | | denotes taking the absolute value.
For a UE-specific search space (UE-specific search space), L takes 1, 2, 4, 8.
Yk＝(A·Yk-1)modD，
Wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identifier).
Configuring a second step:
the user-specific search space of each component carrier is determined according to the component carrier index or the interleaved component carrier index, and the relative position between the starting positions of the user-specific search spaces of the component carriers adjacent to the index is fixed and does not change with the number of CCEs. The UE-specific search space at a certain aggregation level is shown in diagram 5.
UE-specific search spacesThe CCE corresponding to the pdcch (pdcchcandidate) m candidate is defined by the following equation:
wherein, e (Y)k)＝Yk，i＝0，...，L-1，m＝0，…，M(L)-1，M(L)For searching spaceNumber of candidate PDCCHs to be examined, NCCE，kThe number of CCEs carrying the PDCCH control field for the k-th subframe, f (I) is a function of the component carrier index I as input. And f (I) can be defined by the following method:
f(I)＝W·g(I)
wherein, the values of W are as follows:
n is a multiple of L, and when L takes different values, N may have the same value, or may have different values, preferably, when L takes different values, N has the same value, and when L is 1, 2, 4, or 8, N all takes 16;
or W ═ M(L)；
Or W is a fixed integer value, such as 16.
And g (I) can be expressed as:
g (I) H · I, H may take any integer value from 1 to 8, or from 1 to 1For example, H takes 3;
or g (I) ═ (H.I) modQ, and the extraction of H and QThe value being any integer value from 1 to 8, or 1 toPreferably, Q has a value of 8.
For a UE-specific search space (UE-specific search space), L takes 1, 2, 4, 8.
Yk＝(A·Yk-1)modD，
Wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Indicating a rounding down, ns being the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identifier).
Example two:
in an LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, the starting position of the user-specific search space monitored by the PDCCH under each aggregation level may be determined according to the radio network temporary identifier of the user equipment, regardless of the aggregation level. As shown in the schematic diagram 6, the specific configuration is as follows:
in the k sub-frame, the control domain carrying PDCCH is numbered from a group of numbers 0 to NCCE，kN of-1CCE，kAggregation level (aggregation level) L ∈ {1, 2, 4, 8}, UE-specific search spaceIs defined by a set of pdcch candidates (pdcchcandidate). UE-specific search spacesThe starting position of the CCE corresponding to the first pdcch candidate (pdcchcandidate) is defined by the following equation:
wherein,Yk＝(A·Yk-1)modD，Y-1＝nRNTI≠0，A＝39827，D＝65537，denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identifier).
In the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1, 2, 3, 4} or {0, 1, 2, 3, 4, 5, 6, 7 }. The definition of the user-specific search space monitored by the PDCCH can have the following configurations:
configuring a first step:
the user-specific search spaces for each component carrier are uniformly distributed over the entire search space at maximum intervals. The UE-specific search space at a certain aggregation level is shown in diagram 4.
UE-specific search spacesThe CCE corresponding to the pdcch (pdcchcandidate) m candidate is defined by the following equation:
wherein,m (L) is a search spaceNumber of candidate PDCCHs to be examined, NCCE，kThe number of CCEs carrying the PDCCH control field for the k-th subframe, f (I) is a function of the component carrier index I as input. And f (I) can be defined by the following method:
f(I)＝M(L)·I+g(I)
wherein g (i) may be represented by the following method:
or
Or
Alternatively, f (i) may be defined as follows:
or
Here, the NumCC may be the number of component carriers allocated to the user, the number of active component carriers allocated to the user, the maximum number of component carriers of the current system, or the maximum number of component carriersMay be a fixed value which may be any integer value from 2 to 8, or configured by higher layer signaling.Indicating rounding down, | | denotes taking the absolute value.
For a UE-specific search space (UE-specific search space), L takes 1, 2, 4, 8.
Yk＝(A·Yk-1)modD，
Wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identifier).
Configuring a second step:
the user-specific search space of each component carrier is determined according to the component carrier index or the interleaved component carrier index, and the relative position between the starting positions of the user-specific search spaces of the component carriers adjacent to the index is fixed and does not change with the number of CCEs. The UE-specific search space at a certain aggregation level is shown in diagram 5.
UE-specific search spacesThe CCE corresponding to the pdcch (pdcchcandidate) m candidate is defined by the following equation:
wherein,M(L)for searching spaceNumber of candidate PDCCHs to be examined, NCCE，kThe number of CCEs carrying the PDCCH control field for the k-th subframe, f (I) is a function of the component carrier index I as input. And f (I) can be defined by the following method:
f(I)＝W·g(I)
wherein, the values of W are as follows:
n is a multiple of L, for example, N is 16;
or W ═ M(L)；
Or W is a fixed integer value, such as 16.
And g (I) can be expressed as:
g (I) H · I, H may take any integer value from 1 to 8, or from 1 to 1For example, H takes 3;
or g (I) ═ (H · I) modQ, where H and Q take any integer value from 1 to 8, or from 1 to 8Preferably, Q has a value of 8.
For a UE-specific search space (UE-specific search space), L takes 1, 2, 4, 8.
Yk＝(A·Yk-1)modD，
Wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537，Denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (radio network temporary identifier).
Example three:
the method for configuring the component carrier index I in the above embodiment may include:
(1) the component carrier index of the component carrier implementing cross-carrier scheduling may be set to a specified value, which may be, but is not limited to, 0, and may be represented as 000 in binary representation; and arranging the rest component carriers scheduled by the cross-carrier according to the frequency point positions of the component carriers, wherein the component carriers are arranged in the order from large to small (or from small to large), the index values are sequentially configured next to the appointed value, and the value range of the index is 1 to 4 or 1 to 7.
For example: the index corresponding to the component carrier performing cross-carrier scheduling is set to a specified value 0, and 4 component carriers are respectively component carrier 1, component carrier 2, component carrier 3, and component carrier 4, where the component carrier 2 performing cross-carrier scheduling is the component carrier 2, the index allocated to the component carrier 2 is 0, and the component carriers 1, 3, and 4 may be sequentially 1, 2, and 3, or may be sequentially 3, 2, and 1.
(2) Setting the component carrier index of the component carrier implementing cross-carrier scheduling to a specified value, wherein the specified value can be but is not limited to 0, and can be represented as 000 in binary representation; all the component carriers are arranged according to the high-low sequence of the respective frequency points, and the component carrier indexes of other component carriers are circularly allocated according to the appointed value from the component carrier implementing cross-carrier scheduling according to the arrangement sequence, and the value range is from 1 to 4 or from 1 to 7.
For example: the index corresponding to the component carrier performing cross-carrier scheduling is set to a specified value 0, and 4 component carriers are respectively component carrier 1, component carrier 2, component carrier 3, and component carrier 4, where the component carrier 2 performing cross-carrier scheduling is the component carrier 2, the index allocated to the component carrier 2 is 0, and the component carriers 1, 3, and 4 may be sequentially 2, 3, 1, or sequentially 2, 1, and 3.
(3) And continuously configuring component carrier indexes of each component carrier for implementing cross carrier scheduling and cross carrier scheduling according to respective frequency point positions in a high-low sequence, wherein the component carriers can be arranged from large to small or from small to large, and the value range of the indexes is from 0 to 4 or from 0 to 7.
For example: if there are 4 component carriers, which are respectively component carrier 1, component carrier 2, component carrier 3, and component carrier 4 according to the frequency point height arrangement, where the component carrier 2 is implemented with cross-carrier scheduling, the indexes allocated to the 4 component carriers are respectively 0, 1, 2, and 3, or the indexes allocated to the 4 component carriers are respectively 3, 2, 1, and 0.
(4) And configuring the component carrier indexes according to the carrier indication fields of the component carriers configured to the user equipment by the base station, wherein preferably, the component carrier indexes are equal to the values of the carrier indication fields of the component carriers.
For example: if the CIF value is 010, the component carrier index I is 2.
(5) The component carrier indexes are configured according to the carrier indication domain of each component carrier configured to the user equipment by the base station and the total number of the activated component carriers, preferably, the component carriers are arranged according to the value of the carrier indication domain, and the component carrier indexes are continuously allocated to the activated component carriers from 0 according to the sequence of the carrier indication domain values, wherein the sequence can be from small to large or from large to small.
For example: the number of activated component carriers is 2, and the values of the carrier indication fields are 0 and 3, respectively, so the component carrier indexes thereof can be 0 and 1, or 1 and 0, respectively.
(6) The component carrier index is configured by a higher layer signaling configuration.
In summary, the present invention solves the problem how to define the search space for UE to monitor PDCCH when cross-carrier scheduling is enabled in the LTE-Advanced carrier aggregation scenario.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A method of determining a user-specific search space, comprising:
in a carrier aggregation scene, when cross-carrier scheduling is enabled, determining the position of the user-specific search space of each component carrier under each aggregation level, wherein the initial position of the user-specific search space of each component carrier is increased in an equivalent manner relative to the same position;
the user-specific search spaces of the component carriers are uniformly distributed on the whole search space according to the maximum interval; or,
the relative position between the initial positions of the user-specific search spaces of the indexed adjacent component carriers is fixed and does not change along with the number of Control Channel Elements (CCEs);
wherein, the uniform distribution of the user-specific search spaces of the component carriers over the entire search space according to the maximum interval means:
the CCE corresponding to the candidate physical downlink control channel in the user-specific search space is defined as follows:
wherein i is 0, L-1, M is 0, …, M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)In order to search the number of candidate physical downlink control channels to be detected in the space under the condition of aggregation level L, k is the subframe number, and N isCCE,kIs the number of CCEs in subframe k, I is the carrier index of each component carrier, e (Y)k) Searching functions in the space exclusively for the user;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537， Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE;
said f (I) ═ M(L)·I+g(I)；
The above-mentioned
Or
Or
Or, f (I) is:
or,
wherein,the expression is rounded downwards, | | represents the absolute value, and the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, the fixed value is any integer value from 2 to 8, or is configured by high-layer signaling;
the relative position between the starting positions of the user-specific search spaces of the index-adjacent component carriers is fixed, which means that:
the CCE corresponding to the candidate physical downlink control channel in the user-specific search space is defined as follows:
wherein i is 0, L-1, M is 0, …, M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)For searching candidate physical downlink to be detected in space under aggregation level L conditionNumber of control channels, k is subframe number, NCCE,kIs the number of CCEs in subframe k, I is the carrier index of each component carrier, e (Y)k) Searching functions in the space exclusively for the user;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537， Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE;
(i) W · g (i);
wherein, the values of W are as follows:n is a multiple of L; or W ═ M(L)(ii) a Or W is a fixed integer value;
the definition of g (I) is:
g (I) H · I, H taking any integer value from 1 to 8, alternatively from 1 to 1Any integer value of (a);
or g (I) ═ (H · I) modQ, where H and Q take any integer value from 1 to 8, or from 1 to 8Any integer value of (2).
2. The method of claim 1, wherein:
and when the L takes different values, the values of the N are the same.
3. The method of claim 1, wherein:
function e (Y) in the user-specific search spacek) There are two expression modes as follows:
e(Yk)＝Ykeither the first or the second substrate is, alternatively,
4. the method of claim 1, wherein:
the index of the component carrier is configured in any one of the following ways:
(1) setting the component carrier index of the component carrier implementing cross carrier scheduling as a specified value, and sequentially configuring the component carrier indexes of the rest component carriers scheduled by the cross carrier according to the frequency point positions of the component carriers and the specified value;
(2) setting the component carrier indexes of the component carriers implementing cross carrier scheduling as a specified value, arranging all the component carriers according to the high-low sequence of respective frequency points, starting from the component carriers implementing cross carrier scheduling according to the arrangement sequence, and circularly allocating the component carrier indexes of other component carriers next to the specified value;
(3) continuously configuring component carrier indexes for each component carrier which implements cross-carrier scheduling and is subjected to cross-carrier scheduling according to respective frequency point positions in a high-low sequence;
(4) the component carrier index is equal to the value of the carrier indication field of the component carrier;
(5) configuring component carrier indexes according to carrier indication domains of all component carriers configured to user equipment by a base station and the total number of the activated component carriers, and continuously allocating the component carrier indexes to the activated component carriers from 0 according to the sequence of carrier indication domain values, wherein the sequence is from small to large or from large to small;
(6) the component carrier index is configured by a higher layer signaling configuration.
5. An apparatus for determining a user-specific search space includes a setup module; the method is characterized in that:
the setting module is used for determining the position of the user-specific search space of each component carrier in each aggregation level when cross-carrier scheduling is enabled in a carrier aggregation scene; the initial position of the user-specific search space of each component carrier increases progressively in equal quantity relative to the same position;
the user-specific search spaces of the component carriers set by the setting module are uniformly distributed on the whole search space according to the maximum interval; or,
the relative position between the initial positions of the user-specific search spaces of the component carriers adjacent to the index set by the setting module is fixed and does not change along with the number of Control Channel Elements (CCEs);
wherein, the user-specific search spaces of the component carriers set by the setting module are uniformly distributed on the whole search space according to the maximum interval, which means that:
the setting module sets CCE corresponding to the candidate physical downlink control channel in the user special search space according to the following mode:
wherein i is 0, L-1, M is 0, …, M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)In order to search the number of candidate physical downlink control channels to be detected in the space under the condition of aggregation level L, k is the subframe number, and N isCCE,kIs the number of CCEs in subframe k, I is the carrier index of each component carrier, e (Y)k) Searching functions in the space exclusively for the user;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537， Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE;
said f (I) ═ M(L)·I+g(I)；
The above-mentioned
Or
Or
Or, f (I) is:
or,
wherein,the expression is rounded downwards, | | represents the absolute value, and the value of the NumCC is any one of the following methods:
(a) the number of component carriers configured to a user;
(b) a number of active component carriers configured to a user;
(c) the maximum number of component carriers supportable by the current system;
(d) is a fixed value, the fixed value is any integer value from 2 to 8, or is configured by high-layer signaling;
the relative position between the starting positions of the user-specific search spaces of the component carriers adjacent to the index set by the setting module is fixed, which means that:
the setting module sets CCE corresponding to the candidate physical downlink control channel in the user special search space according to the following mode:
wherein i is 0, L-1, M is 0, …, M(L)-1, L is the aggregation level of the physical downlink control channel, M(L)In order to search the number of candidate physical downlink control channels to be detected in the space under the condition of aggregation level L, k is the subframe number, and N isCCE,kIs the number of CCEs in subframe k, I is the carrier index of each component carrier, e (Y)k) Searching functions in the space exclusively for the user;
Yk＝(A·Yk-1)modD，
wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537， Denotes rounding down, nsIs the number of time slots, n, in a radio frameRNTITemporarily identifying the corresponding wireless network;
the same position is the YkThe location of the indicated CCE;
(i) W · g (i);
wherein, the values of W are as follows:n is a multiple of L; or W ═ M(L)(ii) a Or W is takenIs a fixed integer value;
the definition of g (I) is:
g (I) H · I, H taking any integer value from 1 to 8, alternatively from 1 to 1Any integer value of (a);
or g (I) ═ (H · I) modQ, where H and Q take any integer value from 1 to 8, or from 1 to 8Any integer value of (2).
6. The apparatus of claim 5, wherein:
and when the L takes different values, the values of the N are the same.
7. The apparatus of claim 5, wherein:
function e (Y) in the user-specific search spacek) There are two expression modes as follows:
e(Yk)＝Ykeither the first or the second substrate is, alternatively,
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