CN102378129A - Method for transmitting and receiving system message, device and equipment thereof - Google Patents
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Abstract
The invention discloses a method for transmitting and receiving a system message, a device for transmitting and receiving the system message, and equipment for transmitting and receiving the system message, which are used for reducing the occupied public search space resources when a system message is transmitted, and lowering the energy consumption when the system message is received. The method for transmitting the system message comprises the steps of: generating a system message block 1 on a system carrier wave, wherein the system message block 1 comprises 2-N scheduling information of the other system message blocks, and each scheduling information indicates a time frequency position which corresponds to each other system message block; and carrying the generated system message block 1 on the system carrier cave so as to be transmitted.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method, an apparatus, and a device for sending and receiving a system message.
Background
MTC (Machine-Type Communication) refers to Communication between machines (devices and equipments), also referred to as M2M Communication, and as shown in fig. 1, an MTC application scenario includes an MTC terminal, an Operator domain and an MTC server, which is a Communication scenario requiring no human participation. Currently, 3GPP (3rd Generation Partnership Project, third Generation mobile communication standardization organization) has started to discuss the relevant study item, and is studying whether it is necessary to optimize MTC in terms of network, especially whether it will affect the communication between people, also referred to as H2H (Human to Human) communication when massive MTC terminals are applied to practical networks in the future. Considering the wide application prospect of future MTC, how to optimize a network based on H2H communication for different application scenarios is one of the important directions of MTC research.
Currently, the core network specification 3GPP 22.368 defines 16 important features of MTC, including low mobility, time control type, delay tolerant type, online small data transmission type, and the like. Aiming at different application scenes, including meter reading application, remote control and the like, one characteristic or a combination of several characteristics can be provided.
The MTC terminal accesses the small-bandwidth dedicated carrier to carry the small-data MTC service, so that the mutual influence of the MTC service and H2H communication can be reduced, and the resource utilization rate of the system can be improved. Therefore, designing a dedicated carrier for MTC is an important research direction, and the transmission and reception of system messages on the dedicated carrier is the first step of research.
In the following, taking an LTE (Long Term Evolution ) system as an example, a method for sending and receiving a system message in the prior art is described.
The LTE TDD system employs a frame structure as shown in fig. 2 a: a 10ms radio Frame (Frame) is composed of two 5ms fields, each field is composed of 8 0.5ms Traffic Slots (TS) and three special areas, which are respectively: the length of the three special areas can be flexibly configured by high-level signaling, but the total length is kept unchanged at 1 ms. Two continuous service time slots form a Subframe (SF), the length of each subframe is 1ms, each half Frame comprises 4 subframes, one radio Frame comprises 8 subframes, the subframes are subframe #0 and subframe #1.
The LTE FDD system employs a frame structure as shown in fig. 2 b: a 10ms radio Frame (Frame) is composed of two 5ms half-frames, each half-Frame is composed of 10 traffic slots (Time slots, TS) of 0.5ms, two consecutive traffic slots constitute a subframe (Sub-Frame, SF), the length of each subframe is 1ms, each half-Frame includes 5 subframes, one radio Frame includes 10 subframes, which are subframe #0 and subframe #1.
The LTE system is based on an Orthogonal Frequency Division Multiplexing (OFDM) technology, each subframe in the time domain is further divided into a plurality of resource blocks according to Frequency, and the minimum unit of resource scheduling in the LTE system is a resource block.
In the LTE system, system messages are divided into different message blocks according to different assumed functions, including a primary system message, a system message block 1, and a system message block 2. The method for sending the system message comprises the following steps:
1. transmission of host system messages
The main system message is carried on the fixed resource block position of the sub-frame 0 of each radio frame of the system carrier, that is, the fixed time-frequency position terminal equipment of the main system message can know in advance. The primary system message includes carrier bandwidth information, a system frame number, and PHICH (Physical HARQ Indicator channel) configuration information.
2. Transmission of System message Block 1
The system message block 1 is carried on the No. 5 sub-frame of an even wireless frame of a system carrier, and specific resource block position terminal equipment is not known and needs to be obtained through blind detection; in the common search space of the subframe, a PDCCH (Physical Downlink Control Channel) including an SI-RNTI (System Information-Radio Network Temporary Identifier) needs to be placed to indicate a resource block position occupied by the System message block 1. The system message block 1 includes the access permission of the user, the related identification of the system, the scheduling information of other system message blocks (system message blocks 2-12), and the length of the scheduling window. Wherein scheduling information for other system message blocks (system message blocks 2-12) is provided by the base station scheduler including a start position and an end position (represented by the start frame and the end frame, and a subframe number) at which the system message blocks 2-12 may occur.
3. Transmission of other System message blocks (System message blocks 2-12)
The base station equipment places the system message block on a certain section of resource block between a starting position and an ending position which are possibly appeared and correspond to the system message block with a certain identification number according to scheduling information of other system message blocks (the system message blocks 2-12) provided by a base station scheduling device. The system message block may be placed multiple times on different resource blocks between the starting location and the ending location. And in the public search space of the subframe in which the system message block is placed, a PDCCH (physical downlink control channel) comprising an SI-RNTI (system information temporary identifier) is placed for indicating the resource block position occupied by the system message block.
The receiving method of the system message comprises the following steps:
1. reception of host system messages
The terminal equipment firstly receives the main system message, and the terminal equipment only needs to receive the main system message at a pre-known fixed time-frequency position (the fixed resource block position of the No. 0 sub-frame of each radio frame).
2. Reception of System message Block 1
After receiving the main system message, the terminal device acquires the system frame number and the subframe number, and receives the system message block 1 on the subframe No. 5 of the even radio frame. However, since the terminal device does not know the resource block location of the system message block 1 in the sub-frame No. 5 of the even radio frame, blind detection is required. The blind detection means that the terminal device searches a PDCCH including the SI-RNTI in the common search space of the subframe of the system carrier, and after the PDCCH is searched, the position of the resource block of the system message block 1 on the current subframe can be known by analyzing the position of the resource block carried by the PDCCH, so that the specific time-frequency position of the system message block 1 can be known. After the specific time-frequency position of the system message block 1 is known, the terminal device can receive the system message block 1.
3. Reception of other System message blocks (System message blocks 2-12)
After receiving the system message block 1, the terminal device obtains the starting position and the ending position of the system message blocks 2-12. If the terminal equipment needs to acquire the system message block n (n is an integer between 2 and 12), blind detection needs to be performed in a common search space of all subframes between a specified starting position and an ending position of the terminal equipment, a PDCCH (physical downlink control channel) including SI-RNTI (SI-radio network temporary identifier) is searched, once the PDCCH is searched, the position of a resource block of the system message block n on the current subframe can be acquired by analyzing the position of the resource block carried by the PDCCH, and the specific time-frequency position of the system message block n can be acquired. After the specific time-frequency position of the system message block n is known, the terminal device can receive the system message block n.
Aiming at the sending of system message blocks 1-12, the sending and receiving method of the system message provided in the prior art needs base station equipment to send a PDCCH (physical downlink control channel) comprising SI-RNTI (SI-radio network temporary identifier) in a common search space of a system carrier, thereby occupying the common search space resource of the system carrier; for receiving the system message blocks 1-12, the terminal equipment is required to perform blind detection in a common search space of a subframe in a certain range, and the energy of the terminal equipment is consumed. For a system with large bandwidth and supporting H2H communication, the common search space is large, and the requirement of the terminal device on energy consumption is not strict, and the defects can be tolerated. However, for a system with a small bandwidth and supporting MTC, the above disadvantage is particularly significant because the common search space is narrow and the requirement of the terminal device for energy consumption is relatively strict.
Disclosure of Invention
The embodiment of the invention provides a method, a device and equipment for sending and receiving system messages, which are used for reducing public search space resources occupied when the system messages are sent and reducing energy consumption when the system messages are received.
The embodiment of the invention provides a method for sending a system message, which comprises the following steps:
generating a system message block 1 on a system carrier, wherein the system message block 1 comprises scheduling information of other system message blocks 2 to N, and the scheduling information indicates a time-frequency position corresponding to each other system message block;
and carrying the generated system message block 1 on the system carrier for transmission.
The embodiment of the invention provides a method for receiving a system message, which comprises the following steps:
receiving a system message block 1 on a system carrier according to a system frame number extracted from a received main system message and a subframe number determined according to a fixed time-frequency position of the main system message;
and extracting scheduling information of other system message blocks 2 to N from the received system message block 1, wherein the scheduling information indicates the time-frequency position corresponding to each other system message block.
The embodiment of the invention provides a system message sending device, which comprises:
a system message block 1 generating unit, configured to generate a system message block 1 on a system carrier, where the system message block 1 includes scheduling information of other system message blocks 2 to N, and the scheduling information indicates a time-frequency position corresponding to each other system message block;
and a system message block 1 sending unit, configured to send the generated system message block 1 carried on the system carrier.
The embodiment of the invention provides base station equipment which comprises a sending device of the system message.
The embodiment of the invention provides a receiving device of system messages, which comprises:
a system message block 1 receiving unit, configured to receive a system message block 1 on a system carrier according to a system frame number extracted from a received primary system message and a subframe number determined according to a fixed time-frequency position of the primary system message;
and the extracting unit is used for extracting the scheduling information of the other system message blocks 2 to N from the received system message block 1, wherein the scheduling information indicates the time-frequency position corresponding to each other system message block.
The embodiment of the invention provides terminal equipment which comprises a receiving device of the system message.
When the system message is sent, the scheduling information of other system message blocks (system message blocks 2 to N) is carried in the system message block 1, and the scheduling information indicates the time-frequency position corresponding to each other system message block; when other system message blocks are sent, the other system message blocks are carried at the time-frequency position indicated by the scheduling information and sent; therefore, the PDCCH comprising the SI-RNTI does not need to be placed in the common search space of the corresponding subframe to indicate the resource block position occupied by other system message blocks, and the common search space of the corresponding subframe does not need to be occupied, so that the common search space resources occupied when the system messages are sent are reduced. When receiving the system message, the corresponding other system message blocks are received at the indicated time-frequency positions according to the scheduling information of the other system message blocks carried in the system message block 1, blind detection in the public search space of the corresponding subframe is not needed, and energy consumption when receiving the system message is reduced. The method, the device and the equipment for sending and receiving the system message are particularly suitable for a communication system with small bandwidth and limited public search space.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a diagram illustrating an MTC application scenario in the prior art;
fig. 2a is a schematic diagram of a radio frame structure of an LTE TDD system in the prior art;
fig. 2b is a schematic diagram of a radio frame structure of an LTE FDD system in the prior art;
fig. 3 is a flowchart illustrating an implementation of a method for sending a system message according to an embodiment of the present invention;
fig. 4 is a flowchart of an embodiment of a method for receiving a system message according to the present invention;
FIG. 5 is a schematic structural diagram of a system message sending apparatus according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a structure of a system message receiving apparatus according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating an implementation of a method for sending a primary system message in a system supporting MTC according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating an implementation of a method for sending a system message block 1 in a system supporting MTC according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating an implementation of sending method of other system message blocks 2 to N in the system supporting MTC according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating an implementation of a method for receiving a primary system message in a system supporting MTC according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating an implementation of a receiving method of a system message block 1 in a system supporting MTC according to an embodiment of the present invention;
fig. 12 is a flowchart illustrating an implementation of receiving methods for other system message blocks 2 to N in a system supporting MTC according to an embodiment of the present invention.
Detailed Description
In order to reduce the public search space resources occupied when the system message is sent and reduce the energy consumption when the system message is received, the embodiment of the invention provides a method, a device and equipment for sending and receiving the system message.
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are merely for illustrating and explaining the present invention, and are not intended to limit the present invention, and that the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
As shown in fig. 3, an embodiment of the present invention provides a method for sending a system message, including the following steps:
s301, generating a system message block 1 on a system carrier, wherein the system message block 1 comprises scheduling information of other system message blocks (system message blocks 2 to N), and the scheduling information indicates a time-frequency position corresponding to each other system message block;
in a specific implementation, the generated system message block 1 may include the scheduling information and the scheduling window length of whether to grant the user access, the relevant identification of the system, and other system message blocks. Generally, the scheduling information of other system message blocks is generated according to the indication information of the base station scheduler, and is used to indicate the time-frequency position corresponding to each other system message block, where the scheduling information indicates the system frame number and subframe number that may occur in other system message blocks, the resource block position information on the subframe, and the period in which the information block repeatedly appears (referred to as a repetition period for short). Specifically, one other system message block scheduling table may be set in the system message block 1, where each scheduling entry in the scheduling table includes a scheduling entry number, a system message block identification number corresponding to the scheduling entry, resource block indication information, and a cycle in which the system message block repeatedly appears, where the scheduling entry number may be provided in an explicit manner or an implicit manner, where the explicit manner is to directly give the scheduling entry number, and the implicit manner is to implicitly give the scheduling entry number according to an order in which the scheduling entry appears in the scheduling information.
And S302, carrying the generated system message block 1 on the system carrier wave and sending the system message block.
In specific implementation, the generated system message block 1 may be carried on the subframe No. 5 of the radio frame with the system frame number of the system carrier being an even number and transmitted; or, the generated system message block 1 is carried on a fixed resource block position of the No. 5 sub-frame of the radio frame with the system frame number of the system carrier being an even number and is transmitted.
In a specific implementation, the sending method of the system message may further include:
generating other system message blocks on the system carrier;
and respectively carrying each generated other system message block on the time-frequency position corresponding to the other system message block indicated by the scheduling information and transmitting the other system message blocks.
In specific implementation, other system message blocks on the system carrier are generated, the system frame number and the subframe number of the other system message blocks and the resource block positions of the other system message blocks on the subframe are determined according to the indication information provided by the base station scheduler, and the other system message blocks are placed on the fixed resource block positions of the corresponding subframe and are sent.
In particular implementations, the system carrier may be an MTC (machine type communication) dedicated carrier. The main system message sent on the MTC dedicated carrier includes identification information indicating that the current system carrier is an MTC dedicated carrier, and the identification information may be implemented by setting carrier bandwidth information included in the main system message to a carrier bandwidth value that can be identified only by an MTC terminal; and the main system message sent on the MTC special carrier is carried and sent on a fixed resource block position of the No. 0 sub-frame of each wireless frame.
Correspondingly, as shown in fig. 4, an embodiment of the present invention provides a method for receiving a system message, including the following steps:
s401, receiving a system message block 1 on a system carrier according to a system frame number extracted from a received main system message and a subframe number determined according to a fixed time-frequency position of the main system message;
s402, extracting scheduling information of other system message blocks 2 to N from the received system message block 1, wherein the scheduling information indicates the time-frequency position corresponding to each other system message block.
In specific implementation, after receiving the main system message, the subframe number is determined according to the system frame number carried in the main system message and the fixed time-frequency position of the main system message.
Corresponding to the sending method of the system message block 1:
if the terminal equipment does not know the position of a resource block where the system message block 1 is located, searching a PDCCH (physical Downlink control channel) comprising SI-RNTI (SI-radio network temporary identifier) in a public search space of a No. 5 subframe of a wireless frame of which the system frame number of a system carrier is an even number; once the PDCCH is found, the position of the resource block of the system message block 1 on the current subframe can be obtained by analyzing the position of the resource block carried by the PDCCH, and the specific time-frequency position of the system message block 1 is obtained; after the specific time-frequency position is obtained, the terminal equipment can receive the system message block 1;
if the terminal equipment knows the position of the resource block where the system message block 1 is located, the terminal equipment can directly receive the resource block at the position corresponding to the sub-frame No. 5 of the wireless frame of which the system frame number of the system carrier is an even number without blind detection.
After receiving the system message block 1, the scheduling information of other system message blocks can be extracted from the system message block 1, and the scheduling information includes the system frame number and subframe number that may occur in other system message blocks, and the position information of the fixed resource block on the subframe and the period in which other system message blocks repeatedly occur.
In a specific implementation, the method for receiving the system message may further include:
determining time-frequency positions corresponding to other system message blocks needing to be received according to scheduling information of other system message blocks extracted from the system message block 1;
and receiving the other system message blocks needing to be received at the determined time frequency position according to the system frame number extracted from the main system message and the subframe number determined according to the fixed time frequency position of the main system message.
In specific implementation, after receiving the system message block 1, according to the scheduling information of other system message blocks carried in the system message block 1, a fixed time-frequency position for bearing other system message blocks is determined, and according to the system frame number in the received main system message and the subframe number determined according to the fixed time-frequency position of the main system message, a fixed time-frequency position corresponding to the other system message block to be received can be determined, so that the other system message block can be received at the fixed resource block position of the corresponding subframe of the determined system carrier.
Preferably, at least one scheduling entry may be included in the system message block 1, and each scheduling entry includes a scheduling entry number or a scheduling entry number implicitly given by an order in which the scheduling entry appears in the scheduling information, and an identification number of a system message block, resource block indication information, and a cycle in which the system message block repeatedly appears, which correspond to the scheduling entry. The terminal equipment can determine a scheduling parameter value according to a scheduling item number corresponding to an identification number of other system message blocks needing to be received, and determine a system frame number of a wireless frame where the other system message blocks are located according to the determined scheduling parameter value and a cycle of repeated occurrence of the system message blocks, thereby determining a subframe number of a subframe where the other system message blocks are located according to the determined scheduling parameter value, and finally determining the position of a fixed resource block where the other system message blocks are located according to the resource block indication information.
In specific implementation, the system carrier may be an MTC (machine type communication) dedicated carrier, and the main system message received at a fixed time-frequency position of the MTC dedicated carrier known in advance includes identification information indicating that the current system carrier is the MTC dedicated carrier; and when the identification information included in the main system message can be identified, extracting the system frame number included in the main system message and determining the subframe number according to the fixed time frequency position.
Based on the same inventive concept, the embodiment of the present invention further provides a device and an apparatus for sending and receiving a system message, and because the principles of these sending and receiving devices and apparatuses for solving the problems are similar to the method for sending and receiving the system message, the implementation of these devices and apparatuses may refer to the implementation of the method, and repeated details are omitted.
As shown in fig. 5, an apparatus for sending a system message according to an embodiment of the present invention includes:
a generating unit 501, configured to generate a system message block 1 on a system carrier, where the system message block 1 includes scheduling information of other system message blocks (system message blocks 2 to N), and the scheduling information indicates a time-frequency position corresponding to each other system message block;
a sending unit 502, configured to send the generated system message block 1 carried on the system carrier.
In a specific implementation, the generating unit 501 is configured to generate a system message block 1 on a system carrier, where the system message block 1 includes scheduling information of other system message blocks, and the scheduling information indicates a time-frequency position corresponding to each other system message block. A sending unit 502, configured to specifically bear the system message block 1 generated by the generating unit 501 on the subframe No. 5 of the radio frame with the system frame number of the system carrier being an even number, and send the system message block; or, the sending unit 502 is specifically configured to load the generated system message block 1 on a fixed resource block of a subframe No. 5 of a radio frame with a system frame number of an even number of a system carrier, and send the system message block.
In a specific implementation, the generating unit 501 may also be configured to generate other system message blocks on a system carrier; the sending unit 502 may further be configured to respectively carry each other system message block generated by the generating unit 501 at a time-frequency position corresponding to the other system message block indicated by the scheduling information.
In specific implementation, the system carrier may be an MTC (machine type communication) dedicated carrier, and the generating unit 501 may be further configured to generate a main system message on the MTC dedicated carrier, where the main system message includes identification information indicating that a current system carrier is the MTC dedicated carrier; the sending unit 502 may further be configured to send the primary system message generated by the generating unit 501 in a fixed resource block of subframe 0 of each radio frame.
As shown in fig. 6, an apparatus for receiving a system message according to an embodiment of the present invention includes:
a receiving unit 601, configured to receive a system message block 1 on a system carrier according to a system frame number extracted from a received primary system message and a subframe number determined according to a fixed time-frequency position of the primary system message;
an extracting unit 602, configured to extract scheduling information of other system message blocks (system message blocks 2 to N) from the received system message block 1, where the scheduling information indicates a time-frequency position corresponding to each other system message block.
In a specific implementation, the apparatus for receiving a system message may further include:
a determining unit 603, configured to determine, according to scheduling information of other system message blocks extracted from the system message block 1, a time-frequency position corresponding to the other system message block that needs to be received; and
the receiving unit 601 may also be configured to receive the other system message blocks that need to be received at the determined time-frequency position according to the system frame number extracted from the primary system message and the subframe number determined according to the time-frequency position of the primary system message.
The scheduling information comprises at least one scheduling item, and each scheduling item comprises a scheduling item number or a scheduling item number implicitly given by the sequence of the scheduling item appearing in the scheduling information, an identification number of a system message block corresponding to the scheduling item, resource block indication information and a cycle of repeated appearance of the system message block; the determining unit 603 specifically includes:
a first determining subunit 6031, configured to determine a scheduling parameter value according to a corresponding scheduling entry number of another system message block that needs to be received;
a second determining subunit 6032, configured to determine, according to the scheduling parameter value determined by the first determining subunit 6031 and the cycle in which the system message block repeatedly appears, the system frame number of the wireless frame in which the other system message block is located;
a third determining sub-unit 6033, configured to determine, according to the scheduling parameter value determined by the first determining sub-unit 6031, a subframe number of a subframe in which the other system message block is located;
a fourth determining subunit 6034, configured to determine, according to the resource block indication information, the position of the fixed resource block where the other system message block is located.
In a specific implementation, the system carrier may be an MTC (machine type communication) dedicated carrier, and the system message receiving apparatus may further include:
a determining unit 604, configured to determine whether identification information indicating that a current system carrier included in a received primary system message is an MTC dedicated carrier can be identified, where the identification information is included in the primary system message received at a pre-known fixed time-frequency position of the MTC dedicated carrier;
an obtaining unit 605, configured to, if the determination result is yes, extract a system frame number included in the primary system message, and determine a subframe number according to the fixed time-frequency position.
The transmitter of each system message is generally provided in the base station device, and the receiver of each system message is generally provided in the terminal device.
The method for sending and receiving the system message provided by the embodiment of the invention can be applied to a system supporting H2H (Human to Human) communication, a system supporting MTC (machine type communication), and the like. The present invention is particularly applicable to a system supporting MTC with a small bandwidth and a limited common search space, and for better understanding of the present invention, a specific implementation of the embodiment of the present invention is described below by taking an application in the system supporting MTC as an example.
Considering that a new system message block may be introduced for MTC services, in the embodiment of the present invention, in a system with a small bandwidth and supporting MTC, the system message is divided into: a system message block N, where N is an integer greater than or equal to 12.
Based on the division of the system message blocks, the embodiment of the invention provides a method for sending system messages in a system supporting MTC, which includes sending a main system message, sending a system message block 1, and sending other system message blocks 2 to N, which are described below.
As shown in fig. 7, a method for sending a primary system message in a system supporting MTC includes the following steps:
s701, generating a main system message on an MTC (machine type communication) dedicated carrier, wherein the main system message comprises identification information indicating that the current system carrier is the MTC dedicated carrier;
the generated main system message includes carrier bandwidth information, a system frame number of a radio frame and configuration information of a PHICH (physical hybrid automatic repeat request indicator channel), and the generated main system message also includes identification information indicating that the current system carrier is an MTC dedicated carrier.
In a specific implementation, an implementation scheme for indicating that the current system carrier is an MTC dedicated carrier may be that carrier bandwidth information in a main system message is set to a carrier bandwidth value that cannot be identified by a common terminal, and only the MTC terminal may identify the carrier bandwidth value, where the carrier bandwidth value not only represents that the current carrier is an MTC dedicated carrier, but also represents a bandwidth of the current carrier.
S702, the generated main system message is carried on the fixed time frequency position of the MTC special carrier wave to be sent.
In specific implementation, the main system message is placed in a fixed resource block position of the sub-frame 0 of each radio frame of the dedicated carrier for transmission, and the fixed time-frequency position terminal device is known in advance.
As shown in fig. 8, a method for transmitting a system message block 1 in a system supporting MTC includes the following steps:
s801, generating a system message block 1 on an MTC (machine type communication) dedicated carrier, wherein the system message block 1 comprises scheduling information of other system message blocks (system message blocks 2 to N), and the scheduling information is used for indicating a time-frequency position corresponding to each other system message block;
and S802, carrying the generated system message block 1 on the MTC dedicated carrier and sending the system message block.
The following describes the transmission of the system message block 1 in the MTC-enabled system for a small bandwidth, taking the scheduling information as an example to set one other system message block scheduling table in the system message block 1. The scheduling information in implementation takes a scheduling table as an example because the scheduling of other system message blocks is easier to manage in the method, which is also a common management method; however, in theory, other manners are also possible, as long as other manners of scheduling and managing other system message blocks are possible, and the embodiment of establishing the schedule table of other system message blocks is only used for explaining how to implement the present invention, but does not mean that only the schedule table can be used, and the implementation process can be combined with practical needs to determine the corresponding manner.
The schedule table for carrying the time-frequency positions of other system message blocks adopted in this embodiment may be set to the following format, as shown in table 1.
TABLE 1
| Scheduling entry numbering | Corresponding system message block identification number | Resource block indication information | Repetition period |
| 1 | System message block 2 | X | 80ms |
| 2 | System message blocks 3, 4, 5 | Y | 160ms |
The number of the schedule items can also be given in an implicit mode, namely, the number is given by the sequence of each schedule item in the schedule table appearing in the schedule table. The system message block identification number corresponding to the schedule entry is used to indicate which system message block or blocks the current schedule entry corresponds to. The Resource Block indication information is used to indicate that the corresponding system message Block is carried at a specific position on the PDSCH (Physical downlink shared channel), that is, the position and number of PRBs (Physical Resource blocks) on the PDSCH occupied by the corresponding system message Block. The Resource Block indication information may be set according to an RIV (Resource indicator value) or a Resource Block Assignment value carried in a PDCCH (physical downlink control channel) in 3GPP protocols 36.213 and 36.212. The repetition period is used to indicate the period of the system message block occurring repeatedly. The terminal device can receive the required system message block according to the repeated cycle of the system message block as required.
For example, as shown in table 1, a system message block corresponding to a scheduling entry with a scheduling entry number of 1 is a system message block 2, and according to the resource block indication information, the system message block 2 is carried at the X position of the PDSCH, and the system message block 2 is repeatedly transmitted every 80 ms; the system message blocks corresponding to the scheduling entry with the scheduling entry number of 2 are system message blocks 3, 4, 5, and according to the resource block indication information, the 3 system message blocks are carried at the Y position of the PDSCH, and the 3 system message blocks are repeatedly transmitted once every 160 ms.
The sending method of other system message blocks (system message blocks 2 to N) in the system supporting MTC, as shown in fig. 9, includes the following steps:
s901, generating other system message blocks 2 to N on an MTC (machine type communication) dedicated carrier;
and S902, respectively carrying each generated other system message block on the time-frequency position corresponding to the other system message block indicated by the scheduling information, and transmitting.
Correspondingly, the embodiment of the invention provides a method for receiving system messages in a system supporting MTC, which includes receiving a main system message, receiving a system message block 1, and receiving other system message blocks 2 to N, which are described below.
As shown in fig. 10, a method for receiving a primary system message in a system supporting MTC includes the following steps:
s1001, receiving a main system message at a pre-known fixed time frequency position, wherein the main system message comprises identification information indicating that a current system carrier is an MTC (machine type communication) dedicated carrier;
s1002, when the identification information included in the main system message is confirmed to be capable of being identified, acquiring a system frame number carried in the main system message and determining a subframe number according to the fixed time frequency position.
In specific implementation, a main system message is received at a fixed resource block position of a 0 th subframe of each radio frame of a dedicated carrier, where the main system message includes identification information indicating that a current system carrier is an MTC dedicated carrier. The terminal equipment confirms whether the identification information can be identified, if so, the system frame number carried in the main system message is acquired and the subframe number carrying the main system message is determined.
As shown in fig. 11, a method for receiving a system message block 1 in a system supporting MTC includes the following steps:
s1101, receiving a system message block 1 on an MTC (machine type communication) dedicated carrier according to a system frame number extracted from a primary system message and a subframe number determined according to the primary system message;
and S1102, extracting scheduling information of other system message blocks (system message blocks 2 to N) from the received system message block 1, wherein the scheduling information is used for indicating the time-frequency position corresponding to each other system message block.
The receiving method of other system message blocks (system message blocks 2 to N) in the system supporting MTC communication, as shown in fig. 12, includes the following steps:
s1201, according to scheduling information of other system message blocks extracted from the system message block 1, determining time-frequency positions corresponding to the other system message blocks needing to be received;
s1202, receiving the other system message blocks needing to be received at the determined time-frequency positions according to the system frame number extracted from the main system message and the determined subframe number of the main system message.
The following description will be given of the receiving method of other system message blocks by taking the scheduling information of the time-frequency positions of other system message blocks as an example in the form of a scheduling table. In this embodiment, a method for determining a resource block carrying a system message block N (N is an integer greater than or equal to 2) includes: and finding the number N of the scheduling item corresponding to the system message block N in the scheduling table, and if the number of the scheduling item is in an implicit mode, obtaining the number N of the scheduling item by observing the position of the scheduling item in the whole scheduling table. Calculating x ═ N-1 × w, where w is the scheduling window length, x is an integer, and the SFN (System Frequency Number) of the radio frame carrying the System message block N should satisfy: SFN mod T ═ FLOOR (x/10), where T is the repetition period of the other system message blocks in the schedule, and the subframe number SUB at which the system message block N occurs should satisfy SUB ═ x mod 10. And after the SFN and the SUB are determined, the fixed resource block position of the system message block N on the subframe is determined according to the resource block indication information in the scheduling table. After the terminal device determines the time-frequency position of other system message blocks to be received, the terminal device can receive the other system message blocks at the determined time-frequency position, so that blind detection is not needed when the terminal device receives the other system message blocks.
When the system message is sent, the scheduling information of other system message blocks (system message blocks 2 to N) is carried in the system message block 1, and the scheduling information indicates the time-frequency position corresponding to each other system message block; when other system message blocks are sent, the other system message blocks are carried at the time-frequency position indicated by the scheduling information and sent; therefore, the PDCCH comprising the SI-RNTI does not need to be placed in the common search space of the corresponding subframe to indicate the resource block position occupied by other system message blocks, and the common search space of the corresponding subframe does not need to be occupied, so that the common search space resources occupied when the system messages are sent are reduced. When receiving the system message, the corresponding other system message blocks are received at the indicated time-frequency positions according to the scheduling information of the other system message blocks carried in the system message block 1, blind detection in the public search space of the corresponding subframe is not needed, and energy consumption when receiving the system message is reduced. The method, the device and the equipment for sending and receiving the system message are particularly suitable for a communication system with small bandwidth and limited public search space.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (22)
1. A method for sending a system message, comprising:
generating a system message block 1 on a system carrier, wherein the system message block 1 comprises scheduling information of other system message blocks 2 to N, and the scheduling information indicates a time-frequency position corresponding to each other system message block;
and carrying the generated system message block 1 on the system carrier for transmission.
2. The method of claim 1, wherein the sending the generated system message block 1 carried on the system carrier comprises:
the generated system message block 1 is carried on the No. 5 subframe of the wireless frame with the system frame number of the system carrier as an even number and is sent; or,
and carrying the generated system message block 1 on a fixed resource block position of a No. 5 subframe of a wireless frame with the system frame number of the system carrier being an even number, and sending the system message block.
3. The method of claim 1, wherein the scheduling information includes at least one scheduling entry, and each scheduling entry includes a scheduling entry number or a scheduling entry number implicitly given by an order in which the scheduling entry appears in the scheduling information, an identification number of another system message block corresponding to the scheduling entry, resource block indication information, and a cycle in which the other system message block appears repeatedly.
4. The method of claim 1, further comprising:
generating other system message blocks 2 to N on the system carrier;
and respectively carrying each generated other system message block on the time-frequency position corresponding to the other system message block indicated by the scheduling information and transmitting the other system message blocks.
5. The method of any of claims 1 to 4, wherein the system carrier comprises a Machine Type Communication (MTC) dedicated carrier.
6. The method of claim 5, wherein a primary system message on the MTC dedicated carrier includes identification information indicating that a current system carrier is an MTC dedicated carrier; and
and the main system message sent on the MTC special carrier is carried and sent on a fixed resource block position of the No. 0 subframe of each radio frame.
7. The method of claim 6, wherein the identification information indicating that the current system carrier is an MTC-dedicated carrier is implemented by setting carrier bandwidth information included in the primary system message to a carrier bandwidth value that can be recognized only by MTC terminals.
8. A method for receiving a system message, comprising:
receiving a system message block 1 on a system carrier according to a system frame number extracted from a received main system message and a subframe number determined according to a fixed time-frequency position of the main system message;
and extracting scheduling information of other system message blocks 2 to N from the received system message block 1, wherein the scheduling information indicates the time-frequency position corresponding to each other system message block.
9. The method of claim 8, further comprising:
determining time-frequency positions corresponding to other system message blocks needing to be received according to scheduling information of other system message blocks 2 to N extracted from the system message block 1;
and receiving the other system message blocks needing to be received at the determined time frequency position according to the system frame number extracted from the main system message and the subframe number determined according to the fixed time frequency position of the main system message.
10. The method of claim 9, wherein the scheduling information includes at least one scheduling entry, and each scheduling entry includes a scheduling entry number or a scheduling entry number implicitly given by an order in which the scheduling entry appears in the scheduling information, an identification number of another system message block corresponding to the scheduling entry, resource block indication information, and a cycle in which the other system message block appears repeatedly; and
the determining, according to the scheduling information of the other system message blocks 2 to N extracted from the system message block 1, the time-frequency position corresponding to the other system message block that needs to be received specifically includes:
determining a scheduling parameter value according to a scheduling item number corresponding to the identification number of other system message blocks needing to be received;
determining the system frame number of the wireless frame where the other system message blocks needing to be received are located according to the determined scheduling parameter value and the cycle of the other system message blocks appearing repeatedly;
determining the subframe number of the subframe where the other system message block needing to be received is located according to the determined scheduling parameter value;
and determining the position of the fixed resource block where the other system message blocks needing to be received are located according to the resource block indication information.
11. The method of claim 8, 9 or 10, wherein the system carrier comprises a Machine Type Communication (MTC) dedicated carrier.
12. The method according to claim 11, wherein the primary system message received at the pre-known fixed time-frequency location of the MTC dedicated carrier includes identification information indicating that the current system carrier is the MTC dedicated carrier; and
and when the identification information included in the main system message can be identified, extracting the system frame number included in the main system message and determining a subframe number according to the fixed time-frequency position.
13. An apparatus for sending a system message, comprising:
a generating unit, configured to generate a system message block 1 on a system carrier, where the system message block 1 includes scheduling information of other system message blocks 2 to N, and the scheduling information indicates a time-frequency position corresponding to each other system message block;
and a sending unit, configured to send the generated system message block 1 carried on the system carrier.
14. The apparatus of claim 13,
the sending unit is specifically configured to send the generated system message block 1 carried on the subframe No. 5 of the even radio frame of the dedicated carrier; or,
the sending unit is specifically configured to load the generated system message block 1 on a fixed resource block of a subframe No. 5 of an even radio frame of the dedicated carrier and send the system message block.
15. The apparatus of claim 13,
the generating unit is further configured to generate other system message blocks 2 to N on a system carrier;
the sending unit is further configured to respectively carry each generated other system message block in the time-frequency position corresponding to the other system message block indicated by the scheduling information, and send the other system message blocks.
16. The apparatus of claim 13, 14 or 15, wherein the system carrier comprises a machine type communication, MTC, dedicated carrier; and
the generating unit is further configured to generate a main system message on the MTC dedicated carrier, where the main system message includes identification information indicating that a current system carrier is the MTC dedicated carrier;
the sending unit is further configured to bear the generated primary system message on a fixed resource block position of a 0 th subframe of each radio frame and send the primary system message.
17. A base station device, characterized in that it comprises a transmitting apparatus according to any one of claims 14 to 16.
18. An apparatus for receiving a system message, comprising:
a receiving unit, configured to receive a system message block 1 on a system carrier according to a system frame number extracted from a received primary system message and a subframe number determined according to a fixed time-frequency position of the primary system message;
and the extracting unit is used for extracting the scheduling information of the other system message blocks 2 to N from the received system message block 1, wherein the scheduling information indicates the time-frequency position corresponding to each other system message block.
19. The apparatus of claim 18, further comprising:
a determining unit, configured to determine, according to scheduling information of other system message blocks 2 to N extracted from the system message block 1, time-frequency positions corresponding to the other system message blocks that need to be received; and
the receiving unit is further configured to receive the other system message blocks that need to be received at the determined time-frequency positions according to the system frame number extracted from the main system message and the subframe number determined according to the time-frequency position of the main system message.
20. The apparatus of claim 19, wherein the scheduling information includes at least one scheduling entry, each scheduling entry including a scheduling entry number or a scheduling entry number implicitly given by an order in which the scheduling entry appears in the scheduling information, an identification number of another system message block corresponding to the scheduling entry, resource block indication information, and a cycle in which the other system message block appears repeatedly; and
the determining unit specifically includes:
the first determining subunit is used for determining a scheduling parameter value according to a scheduling item number corresponding to the identification number of the other system message block required to be received;
the second determining subunit is used for determining the system frame number of the wireless frame where the other system message block which needs to be received is located according to the determined scheduling parameter value and the cycle where the other system message block repeatedly appears;
a third determining subunit, configured to determine, according to the determined scheduling parameter value, a subframe number of a subframe in which the other system message block that needs to be received is located;
and the fourth determining subunit is configured to determine, according to the resource block indication information, the position of the fixed resource block where the other system message block that needs to be received is located.
21. The apparatus of claim 18, 19 or 20, wherein the system carrier comprises a machine type communication, MTC, dedicated carrier, the apparatus further comprising:
the system comprises a judging unit and a judging unit, wherein the judging unit is used for judging whether identification information indicating that a current system carrier included in a received main system message is a Machine Type Communication (MTC) special carrier can be identified or not, and the identification information is included in the main system message received at a fixed time-frequency position of the MTC special carrier known in advance;
and the acquisition unit is used for extracting the system frame number included in the main system message and determining the subframe number according to the fixed time-frequency position when the judgment result is yes.
22. A terminal device, characterized in that it comprises a receiving apparatus according to any one of claims 18 to 21.
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