CN105281867B

CN105281867B - Control information transmission method and device

Info

Publication number: CN105281867B
Application number: CN201410309499.4A
Authority: CN
Inventors: 石靖; 戴博; 夏树强; 刘锟; 陈宪明; 方惠英
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-06-30
Filing date: 2014-06-30
Publication date: 2020-04-10
Anticipated expiration: 2034-06-30
Also published as: CN105281867A; WO2016000347A1

Abstract

The invention discloses a method and a device for transmitting control information. Wherein, the method comprises the following steps: the base station determines resources for repeatedly transmitting the control information according to predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level; the base station repeatedly transmits the control information on the determined resources. By the method and the device, the problem that the coverage-enhanced MTC terminal cannot correctly receive and detect the control channel under the condition of different repeated transmission times is solved, so that the normal communication requirement of the terminal equipment is ensured.

Description

Control information transmission method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting control information.

Background

A Machine Type Communication (MTC) user terminal (user equipment or terminal), also called a Machine to Machine (M2M) user Communication device, is a main application form of the current internet of things. In recent years, due to the high spectrum efficiency of Long-Term Evolution (Long-Term Evolution, abbreviated LTE)/Long-Term Evolution advanced (Long-Term Evolution Advance, abbreviated LTE-Advance or LTE-a), more and more mobile operators select LTE/LTE-a as the Evolution direction of the broadband wireless communication system. MTC multi-type data services based on LTE/LTE-A will also be more attractive.

Existing LTE/LTE-a systems transmit on a per subframe dynamic schedule, i.e., each subframe may transmit a different control channel.

A Physical Downlink Control Channel (PDCCH) and an Enhanced Physical Downlink Control Channel (EPDCCH) are defined in LTE/LTE-a. Information carried by a Physical Control Format Indicator Channel (PCFICH) is used to indicate the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols for transmitting a PDCCH in one subframe. A Physical Hybrid-Automatic Repeat-reQuest (ARQ) indicator Channel (PHICH) is used to carry acknowledgement/negative-acknowledgement (ACK/NACK) feedback information of uplink transmission data. The downlink control channel adopts blind detection, and the terminal tries to demodulate the downlink control channel in different aggregation levels and candidate sets in a certain search space.

TABLE 1 PDCCH search spaces

The existing UE-specific search space is shown in tables 1 and 2, the search space is composed of candidate sets corresponding to different aggregation levels, and when a terminal demodulates a control channel, it needs to try to demodulate each candidate set until the demodulation is correct, otherwise it is considered that the control channel belonging to the terminal is not received.

TABLE 2 EPDCCH search space (One Distributed EPDCCH-PRB-set-Case 3)

The PDCCH/EPDCCH is used for carrying Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information.

Generally, the MTC terminal may obtain DCI by demodulating the PDCCH/EPDCCH Channel in each subframe, so as to implement demodulation of a Physical Downlink Shared Channel (PDSCH) and scheduling indication information of a Physical Uplink Shared Channel (PUSCH).

Among MTC application terminals, there is a class of terminals where coverage performance is significantly degraded due to limited location or characteristics of the terminals. For example, most of the intelligent meter reading type MTC terminals are fixedly installed in a basement or other low coverage performance environments, and mainly send packet data, so that the requirement on data rate is low, and a large data transmission delay can be tolerated. Because the terminal has low requirement on the data rate, for the data channel, the correct transmission of the packet data can be ensured through a lower modulation coding rate, multiple repeated sending in the time domain and the like. When receiving the control information transmitted repeatedly, the maximum number of blind detections increases exponentially with the number of repeated subframes, so that it is necessary to limit the blind detection path. A common method of limiting the blind detection path uses the same aggregation level and the same candidate set for each subframe. Since the number of times of retransmission is not necessarily a fixed value, for example, the coverage performance changes according to the channel condition or the change of the terminal location, and the number of times of using the retransmission also changes, when the terminal receives and detects the control information, the terminal faces the problem of detecting the number of times of repetition in addition to detecting different aggregation levels, and further needs to determine the location of the service information indicated by the control information. Therefore, it is necessary to further design the reception detection in the case of repeated transmission.

For the problem that the coverage-enhanced MTC terminal cannot correctly receive and detect the control channel under the condition of different repetition times of transmission in the related art, no effective solution is available at present.

Disclosure of Invention

The invention provides a method and a device for transmitting control information, which at least solve the problems.

According to an aspect of the present invention, there is provided a method for transmitting control information, including: the base station determines resources for repeatedly transmitting the control information according to predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level; and the base station repeatedly transmits the control information on the determined resources.

Optionally, the repetition level/number and the aggregation level satisfy at least one of the following relationships: the product of the aggregation level and the repetition level/number of times is a fixed value, and the fixed value corresponds to the coverage level; in case there is only one aggregation level, this one aggregation level corresponds to a plurality of repetition levels/times; under the condition that a plurality of aggregation levels exist, one aggregation level corresponds to one repetition level/frequency, wherein the repetition levels/frequencies corresponding to different aggregation levels are not all the same; in case of multiple aggregation levels, one aggregation level corresponds to multiple repetition levels/times; in the case of multiple repetition levels/times, one repetition level/time corresponds to one aggregation level, wherein the aggregation levels corresponding to different repetition levels/times are not all the same; in the case where there are a plurality of repetition levels/times, one repetition level/time corresponds to a plurality of aggregation levels.

Optionally, the determining, by the base station according to the predefined information, that the resource for repeatedly sending the control information includes: the base station determines resources for repeatedly sending the control information according to first predefined information in the access process of user equipment, wherein the repetition level/times and the aggregation level in the first predefined information meet one of the relations; and after establishing RRC connection with the user equipment, the base station determines resources for repeatedly sending the control information according to second predefined information, wherein the repetition level/frequency and the aggregation level in the second predefined information meet one of the relations.

Optionally, before the base station repeatedly transmits the control information on the determined resource, the method further includes: and the base station adds padding bits in the control information to be transmitted at different repetition times, wherein the sizes of the control information transmitted at different repetition times are different.

Optionally, in a case that the predefined information includes a repetition level/number, the base station scrambles the control information according to at least the repetition level/number in a case that the control information is repeatedly transmitted on the determined resource.

Optionally, when the base station repeatedly transmits the control information/other information, the scrambling code added for scrambling the control information/other information on each subframe remains the same; and/or the base station scrambles other information on each subframe under the condition of repeatedly transmitting the other information except the control information, wherein the added scrambling code is different from each subframe in a group of subframes, and the same scrambling code configuration is adopted in a plurality of groups of subframe groups.

Optionally, the base station further scrambles the control information at least according to a radio frame number.

Optionally, the base station scrambles a scrambling code c of the control information_initDetermined according to the following formula:

or

Where C is a constant and k is the number of each sub-frame k of the repeated transmission₀,k₀+1,...,k₀+ N-1, SFN of k₀The radio frame number of the located subframe, h is the number of downlink subframes available in the radio frame, N is the number of retransmissions,

indicating the cell identity.

Optionally, the scrambling, by the base station, the control information at least according to the repetition level/number includes: the base station calculates to obtain different scrambling code initial values c at least according to different repetition levels/times_init。

Optionally, the base station scramblingScrambling code initial value c of the control information_initDetermined according to the following formula:

or

Wherein,

or

C is constant, k is k for each sub-frame of repeated transmission₀,k₀+1,...,k₀+ N-1, SFN of k₀The number of the subframe where the radio signal is positioned, h is the number of available downlink subframes in the radio frame, N is the number of repeated transmission times, m and k are natural numbers, and N is the number of repeated transmission times_RLA numerical value indicating the repetition level/number of times,

indicating the cell identity.

Optionally, the scrambling, by the base station, the control information at least according to the repetition level/number includes: and the base station intercepts scrambling codes c (n) at different positions according to different repetition levels/times.

Optionally, the scrambling code c (n) for scrambling the control information by the base station is determined according to the following formula: c (n)_RL＝c(n)n＝N_RL,N_RL+1,...,N_RL+M_PN-1; where RL represents the repetition level/number, N_RLNumerical values representing the repetition level/number, M_PNIndicates the length of the c (n) sequence.

Optionally, the repeatedly sending, by the base station, the control information on the determined resource includes: and under the condition that the base station sends the control information on the resources, performing cyclic shift on the control information at least according to the repetition level/times.

Optionally, the base station performs cyclic shift on the control information according to the following formula:

or,

wherein i is 0,1, … M_quad-1，M_quadDenotes w^(p)The length of the sequence.

Optionally, when the base station sends the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or a distance between the first position and the second position is indicated by a high-level signaling, where the fixed value is not less than the repetition number of the control information.

According to another aspect of the present invention, there is also provided a method for transmitting control information, including: the user equipment determines a resource for repeatedly receiving the control information according to predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level; the user equipment repeatedly receives the control information on the determined resource.

Optionally, after the user equipment repeatedly receives the control information on the determined resource, the method further includes: and the user equipment determines the repetition level/times used by the control information according to the bit field in the received control information, wherein the sizes of the control information received by different repetition times are different by adding padding bits.

Optionally, in a case that the predefined information includes a repetition level/number, the user equipment descrambles the control information according to at least the repetition level/number in a case that the control information is repeatedly received on the determined resource.

Optionally, when the user equipment repeatedly transmits the control information/other information, the scrambling code used for descrambling the control information/other information on each subframe remains the same; and/or in the case that the user equipment repeatedly transmits other information except control information, the scrambling code used for descrambling the other information on each subframe is different for each subframe in a group of subframes, and the same scrambling code configuration is adopted among a plurality of groups of subframes.

Optionally, the ue at least further descrambles the control information according to a radio frame number.

Optionally, the user equipment descrambles scrambling code c of the control information_initDetermined according to the following formula:

or

indicating the cell identity.

Optionally, the descrambling, by the ue, the control information at least according to the repetition level/number includes: the user equipment calculates to obtain different scrambling code initial values c at least according to different repetition levels/times_init。

Optionally, the user equipment descrambles the initial value c of the scrambling code of the control information_initDetermined according to the following formula:

or

Wherein,

or

indicating the cell identity.

Optionally, the descrambling, by the ue station, the control information at least according to the repetition level/number includes: and the user equipment intercepts scrambling codes c (n) of different positions according to different repetition levels/times.

Optionally, the scrambling code c (n) for descrambling the control information by the user equipment is determined according to the following formula: c (n)_RL＝c(n)n＝N_RL,N_RL+1,...,N_RL+M_PN-1; where RL represents the repetition level/number, N_RLNumerical values representing the repetition level/number, M_PNIndicates the length of the c (n) sequence.

Optionally, the ue repeatedly receiving the control information on the determined resource includes: and the user equipment performs cyclic shift de-according to the repetition level/times at least under the condition of receiving the control information on the resource.

Optionally, the cyclic shift of the control information by the ue is determined according to the following formula:

or,

wherein i is 0,1, … M_quad-1，M_quadDenotes w^(p)The length of the sequence.

Optionally, when the ue receives the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or a distance between the first position and the second position is indicated by a high-level signaling, where the fixed value is not less than the repetition number of the control information.

According to another aspect of the present invention, there is also provided a transmission apparatus of control information, located in a base station, including: a determining module, configured to determine a resource for repeatedly transmitting control information according to predefined information, where the predefined information includes at least one of: coverage level, repetition level/number of times, aggregation level; a sending module, configured to repeatedly send the control information on the determined resource.

Optionally, the determining module includes: a first determining unit, configured to determine, according to first predefined information, a resource for repeatedly sending the control information during an access procedure of a user equipment, where a repetition level/number of times and an aggregation level in the first predefined information satisfy one of the relationships; and a second determining unit, configured to determine, according to second predefined information, a resource for repeatedly sending the control information after establishing an RRC connection with a user equipment, where a repetition level/number of times and an aggregation level in the second predefined information satisfy one of the relationships.

Optionally, the apparatus further comprises: and the padding module is used for adding padding bits in the control information to be sent in different repetition times, wherein the sizes of the control information sent in different repetition times are different.

Optionally, in a case that the predefined information includes a repetition level/number, the sending module further includes a scrambling unit, configured to scramble the control information at least according to the repetition level/number in a case that the control information is repeatedly sent on the determined resource.

Optionally, the scrambling unit is further configured to, in a case where the control information/other information is repeatedly transmitted, keep the same scrambling code added for scrambling the control information/other information on each subframe; and/or the scrambling unit is further used for scrambling other information except control information on each subframe, wherein the added scrambling code is different from each subframe in a group of subframes, and the same scrambling code configuration is adopted in a plurality of groups of subframes.

Optionally, the scrambling unit is further configured to scramble the control information at least according to a radio frame number.

Optionally, the scrambling unit is further configured to calculate different scrambling code initial values c according to at least the different repetition levels/times_init。

Optionally, the scrambling unit is further configured to truncate the scrambling code c (n) at different positions according to different repetition levels/times.

Optionally, the sending module further includes a cyclic shift unit, configured to perform cyclic shift on the control information at least according to the repetition level/number when the control information is sent on the resource.

Optionally, when the sending module sends the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or a distance between the first position and the second position is indicated by a high-level signaling, where the fixed value is not less than the repetition number of the control information.

According to another aspect of the present invention, there is also provided a control information transmission apparatus, located in a user equipment, including: a first determining module, configured to determine a resource for repeatedly receiving control information according to predefined information, where the predefined information includes at least one of: coverage level, repetition level/number of times, aggregation level; a receiving module, configured to repeatedly receive the control information on the determined resource.

Optionally, the second determining module is configured to determine, according to a bit field in the received control information, a repetition level/number used by the control information, where sizes of the control information received with different repetition numbers are different by adding padding bits.

Optionally, in a case that the predefined information includes a repetition level/number, the first determining module further includes a descrambling unit configured to descramble the control information at least according to the repetition level/number in a case that the control information is repeatedly received on the determined resource.

Optionally, the descrambling unit is further configured to, in a case that the control information/other information is repeatedly transmitted, maintain the same scrambling code used for descrambling the control information/other information on each subframe; and/or the descrambling unit is further used for, under the condition that other information except the control information is repeatedly transmitted, enabling the scrambling codes used for descrambling the other information on the subframes to be different among the subframes in one group of subframes, and enabling the same scrambling code configuration to be adopted among the groups of subframes.

Optionally, the descrambling unit is further configured to descramble the control information at least according to a radio frame number.

Optionally, the descrambling unit is further configured to calculate different scrambling code initial values c according to at least the different repetition levels/times_init。

Optionally, the descrambling unit is further configured to truncate scrambling codes c (n) of different positions according to the different repetition levels/times.

Optionally, the first determining module further includes: and a de-cyclic shift unit, configured to perform de-cyclic shift on the control information at least according to the repetition level/number when the control information is received on the resource.

Optionally, when the receiving module receives the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or a distance between the first position and the second position is indicated by a high-level signaling, where the fixed value is not less than the repetition number of the control information.

According to the invention, the base station is adopted to determine the resources for repeatedly sending the control information according to the predefined information, wherein the predefined information comprises at least one of the following information: coverage level, repetition level/number of times, aggregation level; the method that the base station repeatedly sends the control information on the determined resources solves the problem that the coverage-enhanced MTC terminal cannot correctly receive and detect the control channel under the condition of transmission with different repetition times, thereby ensuring the normal communication requirement of the terminal equipment.

Drawings

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

fig. 1 is a flowchart illustrating a transmission method of control information according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating another method for transmitting control information according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a transmission apparatus of control information according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another apparatus for transmitting control information according to an embodiment of the present invention;

fig. 5 is a diagram illustrating the repetition level/number of control information and the start position of service information according to a preferred embodiment of the present invention;

fig. 6 is a diagram illustrating control information retransmission and traffic information retransmission according to a preferred embodiment of the present invention.

Detailed Description

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

In order to enable a coverage-enhanced MTC terminal to correctly receive and detect a control channel under the condition of transmission with different repetition times, the invention provides a control information transmission method suitable for the coverage-enhanced MTC terminal, so as to solve the problem that a terminal user with a coverage enhancement requirement receives and detects the control channel with transmission with different repetition times and ensure the normal communication requirement of terminal equipment.

The steps illustrated in the flow charts of the drawings may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.

The embodiment provides a transmission method of control information, which is used for a network side. Fig. 1 is a schematic flowchart of a transmission method of control information according to an embodiment of the present invention, and as shown in fig. 1, the flowchart includes the following steps:

step S102, the base station determines the resources for repeatedly sending the control information according to the predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level;

step S104, the base station repeatedly sends the control information on the determined resources.

Through the steps, the base station determines the resource for repeatedly sending the control information according to the predefined information, and sends the control information on the resource, wherein the predefined information at least comprises one of the following information: coverage level, repetition level/number, aggregation level. Compared with the prior art, the user equipment determines the resource for the base station to send the control information according to the predefined information by adopting the same strategy, so that the user equipment can determine the repetition level/frequency according to the predefined information, the problem that the user equipment demodulates the control information when trying to repeat the frequency which is less than the actual use frequency of the base station, and the service information scheduled by the control information is received according to the interval k subframe relation to cause the wrong receiving and detecting of the service information is solved, the problem that the coverage enhanced MTC terminal cannot correctly receive and detect the control channel under the condition of different repetition frequency transmission is solved, and the normal communication requirement of the terminal equipment is ensured.

Optionally, the repetition level/number and the aggregation level satisfy at least one of the following relationships:

the product of the aggregation level and the repetition level/times is a fixed value, and the fixed value corresponds to the coverage level;

only one aggregation level is provided, and one aggregation level corresponds to a plurality of repetition levels/times;

the method comprises the following steps that a plurality of aggregation levels are provided, one aggregation level corresponds to one repetition level/frequency, and the repetition levels/frequencies corresponding to different aggregation levels are not all the same;

the method comprises the following steps that (1) a plurality of repetition levels/times are provided, one repetition level/time corresponds to one aggregation level, and the aggregation levels corresponding to different repetition levels/times are not all the same;

there are multiple aggregation levels, one aggregation level corresponding to multiple repetition levels/times;

there are multiple repetition levels/times, one repetition level/time corresponds to multiple aggregation levels;

optionally, in step S102, in an access process of the ue, the base station determines a resource for repeatedly sending the control information according to first predefined information, where a repetition level/number of times and an aggregation level in the first predefined information satisfy one of the above relations; and after establishing RRC connection with the user equipment, the base station determines resources for repeatedly sending the control information according to second predefined information, wherein the repetition level/times and the aggregation level in the second predefined information meet one of the relations. The relation between the repetition level/frequency and the aggregation level may be the same or different during the access process and after the RRC is established.

Optionally, when the control information is transmitted on the resource, padding bits (e.g. 0bit) are added to the control information, and the padding bits may not carry any data information, and have an effect of making the size (size) of the Downlink Control Information (DCI) different at different repetition times.

Optionally, when the control information is transmitted on the resource, the control information is scrambled at least according to the repetition level/number. Wherein the repetition level/number may be determined according to one of the above-mentioned relations.

Optionally, when the sending control information is transmitted repeatedly, the added scrambling code needs to ensure that each subframe of the repeated transmission remains the same.

Optionally, when other information is sent by repeated transmission, the used scrambling code also needs to ensure that each subframe of the repeated transmission remains the same; or different in the continuous four subframes, and the same scrambling code is used by each four subframe groups of repeated transmission.

Wherein the scrambling code is determined at least based on the radio frame number.

For example:

or

C is a constant. When each sub-frame k of the repeated transmission is k₀,k₀+1,...,k₀+ N-1, SFN taken k₀The number of the subframe where the radio frame is located, h is the number of available downlink subframes in the radio frame, and N is the number of repeated transmission times.

Optionally, different scrambling sequence initial values c are calculated according to different repetition levels/times (RL)_initSo that the scrambling sequences differ for different repetition levels/times.

For example:

or

Wherein m is preferably 3 or 4 or 5 or 6, and k is preferably 2 or 3 or 4.

Optionally, the scrambling sequences c (n) at different positions are truncated according to different repetition levels/times RL, so that the scrambling sequences at different repetition levels/times are different.

For example: c (n)_RL＝c(n)n＝N_RL,N_RL+1,...,N_RL+M_PN-1。

Optionally, when the control information is transmitted on the resource, the control information is cyclically shifted according to at least the repetition level/number.

For example:

or,

wherein i is 0,1, … M_quad-1，M_quadDenotes w^(p)The length of the sequence.

Optionally, the control information is sent on the resource, and the starting subframe position of the plurality of subframes occupied by the service information indicated by the control information is a fixed value or indicated by a high-level signaling from the starting subframe position of the control information, wherein the fixed value is not less than the repetition times of the control information.

The embodiment also provides a transmission method of control information, which is used for a terminal (namely user equipment) side. Fig. 2 is a schematic flowchart of another method for transmitting control information according to an embodiment of the present invention, where as shown in fig. 2, the flowchart includes the following steps:

step S202, the user equipment determines a resource for repeatedly receiving the control information according to predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level;

in step S204, the ue repeatedly receives the control information on the determined resource.

Through the steps, the terminal determines the resource for repeatedly receiving the control information according to the predefined information, and receives the control information on the resource, wherein the predefined information at least comprises one of the following information: compared with the prior art, the method for covering the level, the repetition level/frequency and the aggregation level has the advantages that the user equipment determines the resource of the base station for sending the control information according to the predefined information, so that the user equipment can determine the repetition level/frequency according to the predefined information, the problem that the user equipment demodulates the control information when trying the repetition frequency which is less than the actual use of the base station, and the problem that the service information receiving detection is wrong due to the fact that the user equipment receives the service information scheduled by the control information according to the interval k subframe relation is solved, the problem that the coverage-enhanced MTC terminal cannot correctly receive and detect the control channel under the condition of different repetition frequency transmission is solved, and the normal communication requirement of the terminal equipment is guaranteed.

the aggregation level and the repetition level/times product are in a one-to-one correspondence relationship and are constant values;

only one repetition level/frequency is provided, and one repetition level/frequency corresponds to a plurality of aggregation levels;

optionally, when receiving the control information on the resource, the repetition level/number used by the current control information is obtained according to the bit field in the received control information with different size. The control information with different sizes is distinguished by adding filling bits (for example, 0bit), so that the sizes of the downlink control information are different when the repetition times are different.

Optionally, the control information is descrambled at least according to the repetition level/number when received on the resource.

Optionally, when the receiving control information is repeatedly transmitted, the scrambling code used for demodulation needs to ensure that each subframe of the repeated transmission remains the same.

Optionally, when other information is received through repeated transmission, the scrambling code used for demodulation also needs to ensure that each subframe of the repeated transmission remains the same; or different in the continuous four subframes, and the same scrambling code is used by each four subframe groups of repeated transmission.

For example:

or

Optionally, different descrambling sequence initial values c are calculated according to different repetition levels/times (RL)_initSo that different repetition levels/descrambling sequences are different.

For example:

or

Wherein m is preferably 3 or 4 or 5 or 6, and k is preferably 2 or 3 or 4.

Optionally, the descrambling sequences c (n) at different positions are truncated according to different Repetition Levels (RL) so that the descrambling sequences at different repetition levels/times are different.

For example: c (n)_RL＝c(n)n＝N_RL,N_RL+1,...,N_RL+M_PN-1。

Optionally, when receiving the control information on the resource, the demodulation control information is de-cyclically shifted at least according to the repetition level/number.

For example:

or,

optionally, the control information is received on the resource, and the starting subframe position of the plurality of subframes occupied by the service information indicated by the control information is a fixed value or indicated by a high-level signaling, where the fixed value is not less than the number of times of control information repetition.

By using the control information transmission method provided by the above embodiment of the present invention, the frequency domain position is determined by the predefined information, so that the blocking rate of the control information when the coverage enhancement MTC terminal repeatedly transmits can be reduced, thereby ensuring normal transmission and reception of data information, and reducing system overhead and time delay.

The embodiment of the invention also provides a device for transmitting the control information, which is used for realizing the method for transmitting the control information applied to the network side. Fig. 3 is a schematic structural diagram of a transmission apparatus for control information according to an embodiment of the present invention, as shown in fig. 3, the apparatus includes: a determining module 32 and a transmitting module 34, wherein the determining module 32 is configured to determine a resource for repeatedly transmitting the control information according to predefined information, and the predefined information includes at least one of: coverage level, repetition level/number of times, aggregation level; the sending module 34 is coupled to the determining module 32 for repeatedly sending the control information on the determined resources.

The modules and units related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware. The modules and units described in this embodiment may also be disposed in the processor, and for example, may be described as: a processor includes a determination module 32 and a transmission module 34. The names of these modules do not constitute a limitation to the module itself in some cases, for example, the determination module 32 may also be described as a "module for determining resources for repeatedly transmitting control information according to predefined information".

Optionally, the determining module 32 includes: a first determining unit 322, configured to determine, according to first predefined information, a resource for repeatedly sending control information during an access procedure of a user equipment, where a repetition level/number of times and an aggregation level in the first predefined information satisfy one of relationships; a second determining unit 324, configured to determine, after establishing an RRC connection with the user equipment, a resource for repeatedly sending the control information according to second predefined information, where a repetition level/number of times and an aggregation level in the second predefined information satisfy one of the relationships.

It should be noted that, the embodiments of the present invention are as follows: the "first" and "second" of the "first determination unit" and "second determination unit" are used only for functionally identifying the two units, and are not used for indicating the limitation of the operation and connection order of the units. In addition, in some cases, these units and modules may be combined or separated, and are not limited in the embodiments of the present invention, which are not specifically described.

Optionally, the apparatus further comprises: the padding module 36 is coupled to the transmitting module 34, and is configured to add padding bits to the control information to be transmitted with different repetition times, where the size of the control information transmitted with different repetition times is different.

Optionally, in case that the predefined information comprises a repetition level/number, the transmitting module 34 further comprises a scrambling unit 346 for scrambling the control information at least according to the repetition level/number in case that the control information is repeatedly transmitted on the determined resource.

Optionally, the scrambling unit 346 is further configured to, in case of repeated transmission of the control information/other information, keep the same scrambling code added for scrambling the control information/other information on each subframe; and/or a scrambling unit 346, further configured to, in case of repeatedly transmitting other information except control information, scramble other information on each subframe, add a scrambling code that is different for each subframe within a group in a group of subframes, and employ the same scrambling code configuration among a plurality of groups of subframe groups.

Optionally, the scrambling unit 346 is further configured to scramble the control information at least also according to the radio frame number.

Optionally, the scrambling unit 346 is further configured to obtain different initial values c of scrambling codes according to at least different repetition levels/times_init。

Optionally, the scrambling unit 346 is further configured to truncate the scrambling code c (n) at different positions according to different repetition levels/times.

Optionally, the sending module 34 further includes a cyclic shift unit 348, configured to, in a case that the control information is sent on the resource, cyclically shift the control information at least according to the repetition level/number.

Optionally, when the sending module 34 sends the control information on the resource, distances between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information are fixed values, or a distance between the first position and the second position is indicated by a high-level signaling, where the fixed value is not less than the number of times of repetition of the control information.

The embodiment of the present invention further provides another apparatus for transmitting control information, which is located on a terminal (user equipment) side, for example, in a user equipment, and is used for implementing the method for transmitting control information applied to the terminal side. Fig. 4 is a schematic structural diagram of a transmission apparatus for control information according to an embodiment of the present invention, as shown in fig. 4, the apparatus includes: a first determining module 42 and a receiving module 44, wherein the first determining module 42 is configured to determine a resource for repeatedly receiving the control information according to predefined information, and the predefined information includes at least one of: coverage level, repetition level/number of times, aggregation level; the receiving module 44 is coupled to the first determining module 42 for repeatedly receiving the control information on the determined resources.

Optionally, the apparatus further comprises: a second determining module 46, configured to determine a repetition level/number used by the control information according to a bit field in the received control information, wherein sizes of the received control information with different repetition numbers are different by adding padding bits.

Optionally, in case the predefined information comprises a repetition level/number, the first determining module 42 further comprises a descrambling unit 422 for descrambling the control information at least according to the repetition level/number in case the control information is repeatedly received on the determined resource.

Optionally, the descrambling unit 422 is further configured to, in the case of repeatedly transmitting the control information/other information, keep the same scrambling code used for descrambling the control information/other information on each subframe; and/or a descrambling unit 422, further configured to, in case that other information except the control information is repeatedly transmitted, descramble the other information on each subframe using a scrambling code different for each subframe within a group in a group of subframes, and use the same scrambling code configuration between groups of subframes.

Optionally, the descrambling unit 422 is further configured to descramble the control information at least also according to the radio frame number.

Optionally, the descrambling unit 422 is further configured to calculate different scrambling code initial values c according to at least different repetition levels/times_init。

Optionally, the descrambling unit 422 is further configured to truncate the scrambling code c (n) at different positions according to different repetition levels/times.

Optionally, the first determining module 42 further includes: a de-cyclic shift unit 424, configured to, in case of receiving the control information on the resource, de-cyclically shift the control information at least according to the repetition level/number.

Optionally, when the receiving module 44 receives the control information on the resource, distances between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information are fixed values, or a distance between the first position and the second position is indicated by a high-level signaling, where the fixed value is not less than the number of times of repetition of the control information.

In order to make the technical solution of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. In the present application, the embodiments and various aspects of the embodiments may be combined with each other without conflict.

Since the number of times of retransmission is not necessarily a fixed value, for example, the coverage performance changes according to the channel condition or the change of the terminal location, and the number of times of using the retransmission also changes, when the terminal receives and detects the control information, the terminal faces the problem of detecting the number of times of repetition in addition to detecting different aggregation levels, and further needs to determine the location of the service information indicated by the control information. If the base station side uses a larger number of times of repetition to transmit the control information, and the terminal demodulates the control information when trying the number of times of repetition which is less than the actual number of times of use of the base station, and receives the service information scheduled by the control information according to the interval k subframe relation, thereby causing a service information receiving detection error and causing a communication process that the base station transmits data to the terminal to fail. Therefore, it is necessary to further design the reception detection in the case of repeated transmission.

The base station determines a resource for repeatedly transmitting the control information according to predefined information, which may also be a total aggregated resource, and transmits the control information on the resource, wherein the predefined information at least includes one of the following: coverage level, repetition level/number, aggregation level.

Optionally, the Coverage Level (CL) defines the performance requirement corresponding to the maximum coverage requirement as the maximum coverage level according to the coverage scenario requirements, and assuming that the maximum coverage target is coverage enhancement by 15dB (or 20dB), and assuming that there are 3 coverage levels, the maximum coverage level CL3 corresponds to the performance requirement coverage enhancement by 15dB corresponding to the maximum coverage requirement, CL2 corresponds to 10dB, and CL1 corresponds to 5 dB. The repetition level/number corresponds to a coverage level, e.g. Repetition Level (RL)3 corresponds to coverage level CL3, Repetition Level (RL)2 corresponds to coverage level CL2, Repetition Level (RL)1 corresponds to coverage level CL1, where the repetition level may also be exchanged for a repetition number (RT), e.g. repetition number RT3 corresponds to coverage level CL3, repetition number RT2 corresponds to coverage level CL2, repetition number RT1 corresponds to coverage level CL 1. Aggregation levels are the respective Aggregation Levels (AL) of the control channel, such as AL1, 2, 4, 8 being 1CCE, 2CCE, 4CCE and 8CCE, respectively.

The total aggregated resource is a single value or multiple values.

Preferably, when the total aggregation resource is a single value, the repetition level/number and the aggregation level are in a one-to-one correspondence relationship.

Alternatively, as shown in table 3, the Total Aggregation Resource (TAR) is a single value, that is, the Total sum of the Resource of the Repetition Level (RL) corresponding to the TAR and the Aggregation Level (AL) is a single value, for example, the Repetition Level (RL)3 (for example, repeated 8 times) corresponds to AL2, the RL2 (for example, repeated 4 times) corresponds to AL4, and the RL1 (for example, repeated 2 times) corresponds to AL8, where the TAR is 16 CCEs. The number of blind tests in this case depends on the number of repetition levels (or aggregation levels). The method is suitable for covering the scene with basically unchanged channel state of the enhanced scene. Has certain scheduling flexibility. The timing relationship is fixed or variable, and the condition that the judgment of the timing relationship is wrong due to the judgment of the blind detection repetition level (the reason is that the smaller repetition level is different from the aggregation level used by the larger repetition level) does not occur.

TABLE 3

TAR(CCE)	AL(CCE)	RL(times)
			16	8	2
16	4	4
			16	2	8

Preferably, when the total aggregation resource has a plurality of values, the repetition level/number and the aggregation level have a predefined relationship, and are at least one of the following six types:

the Total Aggregation Resource (TAR) has a plurality of values, i.e. the sum of the resources of the Repetition Level (RL) and the Aggregation Level (AL) has a plurality of values.

One, as shown in table 4, TAR has multiple values and only 1 AL, one AL for each RL. The number of blind tests in this case depends on the number of repetition levels. The method is suitable for covering the scene of the channel state change of the enhanced scene. There is no scheduling flexibility. The timing relationship is fixed or variable, and the condition of wrong timing relationship judgment caused by wrong blind detection repetition level judgment can occur.

TABLE 4

TAR(CCE)	AL(CCE)	RL(times)
			16	8	2
32	8	4
			64	8	8

Second, as shown in table 5, the TAR has multiple values and only 1 RL, one RL for multiple ALs. The number of blind tests in this case depends on the number of aggregation levels. The method is suitable for covering the scene of the channel state change of the enhanced scene. Has certain scheduling flexibility. The timing relation is fixed, and the condition that the judgment of the timing relation is wrong due to the judgment of the blind detection repetition level is not wrong can be avoided. This situation is consistent with the existing protocol blind test.

TABLE 5

TAR(CCE)	AL(CCE)	RL(times)
			64	8	8
32	4	8
			16	2	8

Third, as shown in table 6, there are multiple values for TAR and multiple AL, one AL for each TAR and one RL, and the RL for different AL are not all the same. The number of blind tests in this case depends on the number of aggregation levels. The method is suitable for covering the scene of the channel state change of the enhanced scene. Has certain scheduling flexibility. The timing relation is fixed or variable, and the condition that the judgment of the timing relation is wrong due to the judgment of the blind detection repetition level is not wrong can be avoided.

TABLE 6

TAR(CCE)	AL(CCE)	RL(times)
			64	8	8
16	4	4
			8	2	4

Fourth, as shown in table 7, there are multiple values for TAR and multiple RLs, one RL for each TAR and one AL, and not all the same AL for different RLs. The number of blind tests in this case depends on the number of repetition levels. The method is suitable for covering the scene of the channel state change of the enhanced scene. Has certain scheduling flexibility. The timing relationship is fixed or variable, and the condition of wrong timing relationship judgment caused by wrong blind detection repetition level judgment can occur.

TABLE 7

TAR(CCE)	AL(CCE)	RL(times)
			64	8	8
16	4	4
			8	4	2

And fifthly, the TAR has a plurality of values and a plurality of AL, one AL corresponds to a plurality of TAR, and one AL corresponds to a plurality of RL. The number of blind tests in this case depends on the number of the correspondence between the repetition levels and the aggregation levels. The method is suitable for covering the scene of the channel state change of the enhanced scene. Has certain scheduling flexibility. The timing relationship is fixed or variable, and the condition of wrong timing relationship judgment caused by wrong blind detection repetition level judgment can occur.

For example: as shown in Table 8, TARs are the same for different AL's.

TABLE 8

TAR(CCE)	AL(CCE)	RL(times)
			16	8	2
32	8	4
			16	4	4
32	4	8

For example, as shown in table 9, the case where the TAR is different for different AL is shown.

TABLE 9

TAR(CCE)	AL(CCE)	RL(times)
			64	8	8
32	8	4
			32	4	8
8	4	2

And sixthly, the TAR has a plurality of values and a plurality of RLs, one RL corresponds to a plurality of TARs, and one RL corresponds to a plurality of ALs. The number of blind tests in this case depends on the number of the correspondence between the repetition levels and the aggregation levels. The method is suitable for covering the scene of the channel state change of the enhanced scene. Has certain scheduling flexibility. The timing relationship is fixed or variable, and the condition of wrong timing relationship judgment caused by wrong blind detection repetition level judgment can occur.

For example, as shown in table 10, the case where the TARs are the same for different RLs is shown.

Watch 10

TAR(CCE)	AL(CCE)	RL(times)
			16	8	2
8	4	2
			16	4	4
8	2	4

For example, as shown in table 11, the case where the TAR is different for different RLs is shown.

TABLE 11

TAR(CCE)	AL(CCE)	RL(times)
			16	8	2
8	4	2
			32	8	4
8	2	4

Optionally, when the control information is sent on the resource, 0bit is added to the control information, so that the sizes of the downlink control information (DCI sizes) at different repetition times are different. Wherein, the length of 0bit and the used repetition grade/times are in corresponding relation.

Optionally, 0bit is added to the control information, and the number of all 0 bits added according to different repetition levels/times is different, for example, RL1 adds 1 bit of 0, RL2 adds 2 bits of 0, and RL3 adds 3 bits of 0, so that the DCI size of each repetition level is different when the same DCI format is used.

Preferably, when the control information is transmitted on the resource, the control information is scrambled according to at least the repetition level/number.

Preferably, when the control information is transmitted in a repeated transmission mode, the added scrambling code needs to ensure that each subframe of the repeated transmission remains the same. Similarly, when other information is sent by repeated transmission, the used scrambling code also needs to ensure that each subframe of the repeated transmission is the same; or different in the continuous four subframes, and the same scrambling code is used by each four subframe groups of repeated transmission. This makes it easier for the repeatedly transmitted information to be combined and decoded at the receiving end. Wherein the scrambling code is determined at least also based on the radio frame number.

For example:

or

Furthermore, different scrambling sequence initial values c are obtained according to different repetition levels/times (RL) calculation_initSo that the scrambling sequences differ for different repetition levels/times. Therefore, the receiving end can easily distinguish the information transmitted by using different repetition levels.

For example:

or

Wherein m is preferably 3 or 4 or 5 or 6, and k is preferably 2 or 3 or 4.

Optionally, the scrambling sequences c (n) at different positions are truncated according to different repetition levels/times (RL) so that the scrambling sequences at different repetition levels/times are different. Therefore, the receiving end can easily distinguish the information transmitted by using different repetition levels.

For example: c (n)_RL＝c(n)n＝N_RL,N_RL+1,...,N_RL+M_PN-1

Optionally, when the control information is transmitted on the resource, the control information is cyclically shifted according to at least the repetition level/number. Therefore, the receiving end can easily distinguish the information transmitted by using different repetition levels.

For example:

optionally, the control information is sent on the resource, the start of the control information is a fixed value from the start subframe position of the plurality of subframes occupied by the service information indicated by the control information to the start of the control information, and the fixed value is not less than the repetition times of the control information. Therefore, the receiving end can not judge errors when determining the timing relation between the traffic channel and the control channel. As shown in fig. 5.

Optionally, the control information is sent on the resource, and the starting subframe of the control information is indicated by a high-level signaling from the starting subframe position of the plurality of subframes occupied by the service information indicated by the subframe control information to the starting subframe of the control information. Therefore, the receiving end can not judge errors when determining the timing relation between the traffic channel and the control channel. As shown in fig. 6.

Alternatively, assuming that the message in the CSS is sent by using the largest repetition level, and the requirement of the USS for blind detection of repetition levels is more obvious due to different services of each UE, a timing relationship (k represents a distance between a PDSCH starting subframe and a (E) PDCCH ending subframe) and a repetition level of a traffic channel are indicated by an RRC signaling after RRC connection establishment. As shown in table 12.

TABLE 12 timing relationship for blind duplicate rating detection for single aggregation level

RRC signaling index	PDSCH repetition level	PDSCH- (E) PDCCH timing relationship
			1	RL1	k＝1
2	RL2	k＝9
			3	RL3	k＝13

Example 1

The present embodiment describes the method for transmitting control information according to the present invention in detail.

And the base station determines the total aggregation resources for repeatedly sending the control information according to the coverage grade, the repetition grade and the aggregation grade, and sends the control information on the resources. As shown in table 13, at this time, the Total Aggregation Resource (TAR) uses multiple values and only 1 AL, there are 3 RL1-3 repetition levels, and one of the multiple total aggregation resources is used for transmission using AL4 and RL4 in the table.

Watch 13

TAR(CCE)	AL(CCE)	RL(times)
			8	4	2
16	4	4
			32	4	8

When adding scrambling code in control information processing, the Repetition Level (RL) is used as initial value c of calculation scrambling sequence_initSuch that the scrambling sequences differ for different repetition levels/times. And the added scrambling code needs to ensure that the same is maintained on each sub-frame of the repeated transmission. The initial value of the scrambling sequence is

Or

And the scrambled control information is sent to the terminal after modulation, cyclic shift and resource mapping.

The terminal blind-checks the received control information, uses the total aggregation resources of a plurality of values, and needs to blind-check 3 Repetition Levels (RL), and the blind-check times are in direct proportion to the number of the repetition levels. And the terminal respectively carries out blind detection on the control information according to different repetition levels, and respective descrambling sequences are used during the blind detection of the different repetition levels to obtain the corresponding control information.

Through the embodiment, the repeatedly transmitted control information can adapt to a coverage change scene by using different repetition levels, and the terminal obtains the control information by blindly detecting the repetition levels. Meanwhile, different scrambling codes are used in different repetition levels, the condition that the scheduled service information timing relation is judged wrongly because the demodulation is correct in advance can not occur during receiving and detecting, and the information transmission is correct under the condition of blind detection of the repetition levels.

Example 2

And the base station determines the total aggregation resources for repeatedly sending the control information according to the coverage grade, the repetition grade and the aggregation grade, and sends the control information on the resources. As shown in table 14, the coverage Class (CL) is CL1, and a single aggregation class is used to transmit using AL8 and RL2 in the table.

TABLE 14

TAR(CCE)	AL(CCE)	RL(times)
			16	8	2
16	4	4
			16	2	8

The terminal blind-checks to receive the control information, uses the total aggregation resource with a single value, and needs to blind-check 3 Repetition Levels (RL), wherein the aggregation levels correspond to the repetition levels one by one.

With the embodiment, the terminal obtains the control information by blind detection of the repetition level. Meanwhile, different repetition levels correspond to aggregation levels one to one, so that the condition that the scheduled service information timing relation is judged wrongly due to correct advanced demodulation does not occur during receiving detection, and the correct information transmission is ensured under the condition of blind detection of the repetition levels.

Example 3

And the base station determines the total aggregation resources for repeatedly sending the control information according to the coverage grade, the repetition grade and the aggregation grade, and sends the control information on the resources. As shown in table 15, the Total Aggregated Resource (TAR) uses multiple values and there are multiple RLs, one for each TAR and one for each AL, where the AL for different RLs are not all the same. There are 3 RL1-3 repetition levels, transmitted using AL8 and RL4 in the table, using one of a plurality of total aggregated resources.

Watch 15

TAR(CCE)	AL(CCE)	RL(times)
			64	4	16
32	8	4
			16	8	2

When adding a scrambling code in control information processing, a Repetition Level (RL) is taken as one item in calculating a scrambling sequence so thatThe scrambling sequences differ for different repetition levels/times. Scrambling sequence is c (n)_RL1＝c(n)n＝N_RL1,N_RL1+1,...,N_RL1+M_PN-1. And the added scrambling code needs to ensure that the same is maintained on each sub-frame of the repeated transmission. The initial value of the scrambling sequence is

Or

Example 4

And the base station determines the total aggregation resources for repeatedly sending the control information according to the coverage grade, the repetition grade and the aggregation grade, and sends the control information on the resources. As shown in table 16, in this case, the Total Aggregated Resource (TAR) uses a plurality of values and has a plurality of ALs, one AL corresponds to a plurality of TARs, one AL corresponds to a plurality of RLs, and different ALs are the same for TARs. There are 3 RL1-3 repetition levels, transmitted using AL8 and RL4 in the table, using one of a plurality of total aggregated resources.

TABLE 16

TAR(CCE)	AL(CCE)	RL(times)
			64	8	8
32	8	4
			64	4	16
32	4	8

When adding the scrambling code in the control information processing, the added scrambling code needs to ensure that each sub-frame of the repeated transmission is kept the same. The initial value of the scrambling sequence is

Or

The scrambled control information is modulated and circularly shifted, wherein the control information is revised according to the repetition grade/times when circularly shifted

And then the resource mapping is carried out and the resource mapping is sent to the terminal.

The terminal blind test receives the control information, uses the total aggregation resources of a plurality of values, and needs to blind test 3 Repetition Levels (RL), and the blind test frequency is in direct proportion to the number of corresponding relations between the repetition levels and the aggregation levels. And the terminal respectively carries out blind detection on the control information according to different repetition levels, and respective cyclic shift demodulation is used during the blind detection of different repetition levels to obtain corresponding control information.

Through the embodiment, the repeatedly transmitted control information can adapt to a coverage change scene by using different repetition levels, and the terminal obtains the control information by blindly detecting the repetition levels. Meanwhile, different cyclic shifts are used in different repetition levels, the condition that the scheduled service information timing relation is judged wrongly because the demodulation is correct in advance can not occur during receiving detection, and the information transmission is correct under the condition of blind detection of the repetition levels.

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

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

Claims

1. A method for transmitting control information, comprising:

the base station determines resources for repeatedly transmitting the control information according to predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level;

the base station repeatedly sends the control information on the determined resources;

wherein the repetition level/number and the aggregation level satisfy at least one of the following relationships: the product of the aggregation level and the repetition level/number of times is a fixed value, and the fixed value corresponds to the coverage level; in case there is only one aggregation level, this one aggregation level corresponds to a plurality of repetition levels/times; under the condition that a plurality of aggregation levels exist, one aggregation level corresponds to one repetition level/frequency, wherein the repetition levels/frequencies corresponding to different aggregation levels are not all the same; in case of multiple aggregation levels, one aggregation level corresponds to multiple repetition levels/times; in the case of multiple repetition levels/times, one repetition level/time corresponds to one aggregation level, wherein the aggregation levels corresponding to different repetition levels/times are not all the same; in the case where there are a plurality of repetition levels/times, one repetition level/time corresponds to a plurality of aggregation levels.

2. The method of claim 1, wherein the base station determines the resources for repeatedly transmitting the control information according to the predefined information comprises:

the base station determines resources for repeatedly sending the control information according to first predefined information in the access process of user equipment, wherein the repetition level/times and the aggregation level in the first predefined information meet one of the relations;

and after establishing RRC connection with the user equipment, the base station determines resources for repeatedly sending the control information according to second predefined information, wherein the repetition level/frequency and the aggregation level in the second predefined information meet one of the relations.

3. The method of claim 1, wherein before the base station repeatedly transmits the control information on the determined resources, the method further comprises:

and the base station adds padding bits in the control information to be transmitted at different repetition times, wherein the sizes of the control information transmitted at different repetition times are different.

4. The method of claim 1, wherein in case that the predefined information comprises a repetition level/number, the base station scrambles the control information at least according to the repetition level/number in case that the control information is repeatedly transmitted on the determined resources.

5. The method of claim 4,

under the condition that the control information/other information is repeatedly transmitted, scrambling codes added for scrambling the control information/other information on each subframe are kept the same by the base station; and/or

The base station scrambles other information on each subframe under the condition of repeatedly transmitting the other information except the control information, and the added scrambling code is different among the subframes in one group of subframes, and the same scrambling code configuration is adopted among the groups of subframes.

6. The method of claim 5, wherein the base station further scrambles the control information according to at least a radio frame number.

7. According to the rightThe method of claim 6, wherein the base station scrambles a scrambling code c of the control information_init is determined according to the following formula:

or

indicating the cell identity.

8. The method of claim 4, wherein the base station scrambling the control information according to at least the repetition level/number comprises:

the base station calculates to obtain different scrambling code initial values c at least according to different repetition levels/times_init。

9. The method of claim 8, wherein the base station scrambles an initial value c of a scrambling code of the control information_initDetermined according to the following formula:

or

Wherein,

or

indicating the cell identity.

10. The method of claim 4, wherein the base station scrambling the control information according to at least the repetition level/number comprises:

and the base station intercepts scrambling codes c (n) at different positions according to different repetition levels/times.

11. The method of claim 10, wherein the scrambling code c (n) for the base station to scramble the control information is determined according to the following formula:

c(n)_RL＝c(n) n＝N_RL,N_RL+1,...,N_RL+M_PN-1；

where RL represents the repetition level/number, N_RLNumerical values representing the repetition level/number, M_PNIndicates the length of the c (n) sequence.

12. The method of claim 1, wherein the base station repeatedly transmitting the control information on the determined resources comprises:

and under the condition that the base station sends the control information on the resources, performing cyclic shift on the control information at least according to the repetition level/times.

13. The method of claim 12, wherein the base station cyclically shifts the control information according to the following formula:

or,

wherein i is 0,1, … M_quad-1，M_quadDenotes w^(p)The length of the sequence;

wherein N is_RLA numerical value indicating the repetition level/number of times,

indicating the cell identity.

14. The method according to any one of claims 1 to 13, wherein when the base station sends the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the service information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or the distance between the first position and the second position is indicated by a high layer signaling, wherein the fixed value is not less than the number of times of repetition of the control information.

15. A method for transmitting control information, comprising:

the user equipment determines a resource for repeatedly receiving the control information according to predefined information, wherein the predefined information comprises at least one of the following: coverage level, repetition level/number of times, aggregation level;

the user equipment repeatedly receives the control information on the determined resources;

16. The method of claim 15, wherein after the ue repeatedly receives the control information on the determined resource, the method further comprises:

and the user equipment determines the repetition level/times used by the control information according to the bit field in the received control information, wherein the sizes of the control information received by different repetition times are different by adding padding bits.

17. The method of claim 15, wherein in case that the predefined information comprises a repetition level/number, the UE descrambles the control information at least according to the repetition level/number in case that the UE repeatedly receives the control information on the determined resources.

18. The method of claim 17,

the scrambling codes used by the user equipment for descrambling the control information/other information on each subframe are kept the same under the condition of repeatedly receiving the control information/other information; and/or

When the user equipment repeatedly receives other information except the control information, the scrambling code used for descrambling the other information on each subframe is different among the subframes in one group, and the same scrambling code configuration is adopted among the groups of subframes.

19. The method of claim 18, wherein the UE further descrambles the control information at least according to a radio frame number.

20. The method of claim 19, wherein the UE descrambles scrambling code c of the control information_initDetermined according to the following formula:

or

indicating the cell identity.

21. The method of claim 17, wherein the user equipment descrambles the control information at least according to the repetition level/number of times comprises:

the user equipment calculates to obtain different scrambling code initial values c at least according to different repetition levels/times_init。

22. The method of claim 21, wherein the UE descrambles scrambling code initial value c of the control information_initDetermined according to the following formula:

or

Wherein,

or

indicating the cell identity.

23. The method of claim 17, wherein the user equipment station descrambling the control information at least according to the repetition level/number comprises:

and the user equipment intercepts scrambling codes c (n) of different positions according to different repetition levels/times.

24. The method of claim 23, wherein the scrambling code c (n) for descrambling the control information by the ue is determined according to the following formula:

c(n)_RL＝c(n) n＝N_RL,N_RL+1,...,N_RL+M_PN-1；

25. The method of claim 15, wherein the ue repeatedly receiving the control information on the determined resources comprises:

and the user equipment performs cyclic shift de-according to the repetition level/times at least under the condition of receiving the control information on the resource.

26. The method of claim 25, wherein the user equipment de-cyclically shifts the control information according to the following formula:

or,

wherein i is 0,1, … M_quad-1，M_quadDenotes w^(p)The length of the sequence;

indicating the cell identity.

27. The method according to any one of claims 15 to 26, wherein when the ue receives the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the traffic information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or the distance between the first position and the second position is indicated by a high layer signaling, where the fixed value is not less than the number of repetitions of the control information.

28. A transmission apparatus for control information, located in a base station, comprising:

a determining module, configured to determine a resource for repeatedly transmitting control information according to predefined information, where the predefined information includes at least one of: coverage level, repetition level/number of times, aggregation level;

a sending module, configured to repeatedly send the control information on the determined resource;

29. The apparatus of claim 28, wherein the determining module comprises:

a first determining unit, configured to determine, according to first predefined information, a resource for repeatedly sending the control information during an access procedure of a user equipment, where a repetition level/number of times and an aggregation level in the first predefined information satisfy one of the relationships;

and a second determining unit, configured to determine, according to second predefined information, a resource for repeatedly sending the control information after establishing an RRC connection with a user equipment, where a repetition level/number of times and an aggregation level in the second predefined information satisfy one of the relationships.

30. The apparatus of claim 28, further comprising:

and the padding module is used for adding padding bits in the control information to be sent in different repetition times, wherein the sizes of the control information sent in different repetition times are different.

31. The apparatus of claim 28, wherein in case that the predefined information comprises a repetition level/number, the transmitting module further comprises a scrambling unit for scrambling the control information according to at least the repetition level/number in case that the control information is repeatedly transmitted on the determined resources.

32. The apparatus of claim 31,

the scrambling unit is further configured to, in the case of repeatedly transmitting the control information/other information, keep the same scrambling code added for scrambling the control information/other information on each subframe; and/or

The scrambling unit is further configured to, in the case where information other than control information is repeatedly transmitted, scramble the information on each subframe, wherein a scrambling code added to the information is different for each subframe in a group of subframes, and a same scrambling code configuration is adopted for groups of subframes.

33. The apparatus of claim 32, wherein the scrambling unit is further configured to scramble the control information further based at least on a radio frame number.

34. The apparatus according to claim 31, wherein the scrambling unit is further configured to calculate different initial values c of scrambling codes according to at least different repetition levels/times_init。

35. The apparatus of claim 31, wherein the scrambling unit is further configured to truncate the scrambling code c (n) at different positions according to different repetition levels/times.

36. The apparatus of claim 28, wherein the transmitting module further comprises a cyclic shift unit configured to cyclically shift the control information according to at least the repetition level/number when the control information is transmitted on the resource.

37. The apparatus according to any one of claims 28 to 36, wherein, when the sending module sends the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the traffic information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or the distance between the first position and the second position is indicated by a high layer signaling, where the fixed value is not less than the number of times of repetition of the control information.

38. An apparatus for transmitting control information, located in a user equipment, comprising:

a first determining module, configured to determine a resource for repeatedly receiving control information according to predefined information, where the predefined information includes at least one of: coverage level, repetition level/number of times, aggregation level;

a receiving module, configured to repeatedly receive the control information on the determined resource;

39. The apparatus of claim 38, further comprising:

and a second determining module, configured to determine, according to a bit field in the received control information, a repetition level/number used by the control information, where sizes of the control information received with different repetition numbers are different by adding padding bits.

40. The apparatus of claim 38, wherein in case that the predefined information comprises a repetition level/number, the first determining module further comprises a descrambling unit for descrambling the control information according to at least the repetition level/number in case that the control information is repeatedly received on the determined resource.

41. The apparatus of claim 40,

the descrambling unit is further configured to, under the condition that the control information/other information is repeatedly transmitted, maintain the same scrambling code used for descrambling the control information/other information on each subframe; and/or

The descrambling unit is further configured to, in the case that other information than the control information is repeatedly transmitted, descramble the other information on each subframe using a scrambling code that is different for each subframe within a group of subframes, and use the same scrambling code configuration among a plurality of groups of subframes.

42. The apparatus of claim 41, wherein the descrambling unit is further configured to descramble the control information further based at least on a radio frame number.

43. The apparatus of claim 40, wherein the descrambling unit is further configured to not count at least according to the different repetition levels/timesSame scrambling code initial value c_init。

44. The apparatus of claim 40, wherein the descrambling unit is further configured to truncate the scrambling code c (n) at different positions according to different repetition levels/times.

45. The apparatus of claim 38, wherein the first determining module further comprises:

and a de-cyclic shift unit, configured to perform de-cyclic shift on the control information at least according to the repetition level/number when the control information is received on the resource.

46. The apparatus according to any one of claims 38 to 45, wherein, when the receiving module receives the control information on the resource, a distance between a first position of a starting subframe of a plurality of subframes occupied by the traffic information indicated by the control information and a second position of the starting subframe of the control information is a fixed value, or the distance between the first position and the second position is indicated by a high layer signaling, where the fixed value is not less than the number of repetitions of the control information.