CN107734599B - Method and device for determining system information - Google Patents
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- 230000000694 effects Effects 0.000 abstract description 3
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- 101150096310 SIB1 gene Proteins 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 101150014328 RAN2 gene Proteins 0.000 description 2
- 101150039363 SIB2 gene Proteins 0.000 description 2
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- H—ELECTRICITY
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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Abstract
The invention provides a method and a device for determining system information, wherein the method comprises the following steps: acquiring at least one cell characteristic information for describing cell characteristics; and determining system information corresponding to the cell characteristic information according to the acquired cell characteristic information. The invention solves the problems that the increase of the system information in the related technology causes the time of the user equipment for obtaining the effective system information to be prolonged, and the base station needs more resources to send the system information, thereby reducing the effectiveness of the resources and increasing the signaling overhead of the system, thereby achieving the effects of more effectively utilizing the resources and reducing the signaling overhead.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for determining system information.
Background
Currently, System Information is divided into a Master Information Block (MIB) and a System Information Block (SIB) according to the importance of broadcast Information content and different transmission modes. The MIB mainly carries the most basic information of a cell, such as a system frame number, a cell bandwidth, and Physical Hybrid ARQ Indicator Channel (PHICH) Channel information. SIB1-SIB20 are used as SIB classification according to the content. The MIB message is broadcasted on a Physical broadcast Channel (PBCH for short), and a Radio Resource Control (RRC for short) message of a Physical Downlink shared Channel (PDSCH for short) is issued. The SIB1 is carried by a "SystemInformationBlockType 1" message, and the SIB2 and other SIBs are carried by a "systeminformation- (si)" message. One SI message may contain one or more SIBs. The MIB is adjacent to the synchronization channel in the time domain, retransmitted 4 times with a period of 10ms, and located on 72 subcarriers in the center of the system bandwidth in the frequency domain. SIB2 is fixed to be retransmitted 4 times at a 20ms period, that is, SIB1 is retransmitted once (SFN mod2 ═ 0, SFNmod8 ≠ 0) in subframe #5 of each radio frame (20ms), and if a Single Frequency Network (SFN) mod8 ═ 0 is satisfied, the content of SIB1 may be changed and newly transmitted once. The transmission of the SIB1 is completed by scheduling a Physical Downlink Control channel (PDCCH for short) carrying the SI-RNTI (each cell of the SI-RNTI is the same), the scheduling info list in the SIB1 carries scheduling information of all SIs, and after receiving the SIB1, other SI messages can be received.
Table 1 summarizes the definition of MIBs and SIBs in Rel-13LTE RRC 36.413, as shown in Table 1:
TABLE 1
At the 93b meeting of TSG RAN2 in the third Generation Partnership Project (3rd Generation Partnership Project, 3GPP for short), Samsung et al propose that RAN2 should investigate a mechanism that can reduce system information signaling and improve energy efficiency. The number of SIBs in the system information of the existing LTE, in addition to the MIB information, is as large as 20, and with the continuous evolution of wireless technology, SIBs still have an increasing trend. Some SIBs are set for specific users in a specific scenario, for example, SIB19 is set for D2D, SIB20 is set for private network, so it is useless for other ordinary UEs to monitor the information, and it also makes time delay for obtaining valid system information, it is necessary for the base station to allocate certain resources for broadcasting the system information, and if there is no need for broadcasted system information for the UEs in the next cell, the resources are wasted, which affects resource utilization of the cell.
In view of the above technical problems, no effective solution has been proposed in the related art.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining system information, which are used for at least solving the problems that the increase of the system information in the related technology causes the time for obtaining effective system information by user equipment to be prolonged, and simultaneously, a base station needs more resources to send the system information, so that the effectiveness of the resources is reduced and the signaling overhead of a system is increased.
According to an embodiment of the present invention, there is provided a method for network access, including: acquiring at least one cell characteristic information for describing cell characteristics; and determining system information corresponding to the cell characteristic information according to the acquired cell characteristic information.
Optionally, the cell characteristic information includes at least one of: cell identification information, subframe type.
Optionally, the system information includes at least one of: random access information, system bandwidth information.
Optionally, determining, according to the obtained cell characteristic information, random access information corresponding to the cell characteristic information includes: acquiring a configuration index number of a PRACH (random access channel) by a formula (cell ID) mod (N +1), and acquiring a time-frequency resource position for sending a preamble, wherein the cell ID is the cell identifier, and N is the number of PRACH configurations in a Frequency Division Duplex (FDD) mode or a Time Division Duplex (TDD) mode; and determining the index number rootsequency index of the root sequence according to the configured index number of the PRACH by the following formula: (rootsequenceindex) ═ cell ID mod (M +1), where M is the total number of root sequences; generating a preamble set according to the rootsequency index; and the time-frequency resource is used for sending one preamble in the preamble set.
Optionally, determining, according to the obtained cell characteristic information, system bandwidth information corresponding to the cell characteristic information includes: acquiring downlink bandwidth information through a formula int [ cell ID/100], wherein the cell ID is the cell identifier; and acquiring the system index information according to the downlink bandwidth information.
In another embodiment of the present invention, there is also provided a system information determining apparatus, including: an obtaining module, configured to obtain at least one type of cell feature information used for describing a cell feature; and the determining module is used for determining the system information corresponding to the cell characteristic information according to the acquired cell characteristic information.
Optionally, the cell characteristic information includes at least one of: cell identification information, subframe type.
Optionally, the system information includes at least one of: random access information, system bandwidth information.
Optionally, when determining the random access information corresponding to the cell characteristic information according to the obtained cell characteristic information, the determining module includes: a first obtaining unit, configured to obtain a configuration index number of a PRACH (random access channel) by a formula (cell ID) mod (N +1), and obtain a time-frequency resource location for sending a preamble, where the cell ID is the cell identifier, and N is the number of PRACH configurations in an FDD (frequency division duplex) mode or a TDD (time division duplex) mode; a determining unit, configured to determine, according to the configured index number of the PRACH, an index number rootsequencinindex of a root sequence by using the following formula: (rootsequenceindex) ═ cell ID mod (M +1), where M is the total number of root sequences; the generating unit is used for generating a preamble set according to the rootsequency index; and the time-frequency resource is used for sending one preamble in the preamble set.
Optionally, when determining the system bandwidth information corresponding to the cell characteristic information according to the obtained cell characteristic information, the determining module includes: a second obtaining unit, configured to obtain downlink bandwidth information through a formula int [ cell ID/100], where the cell ID is the cell identifier; and a third obtaining unit, configured to obtain the system index information according to the downlink bandwidth information.
According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the above steps.
According to the invention, the system information is determined according to the cell identification information after the cell identification information is acquired, and the network is accessed according to the system information. Therefore, the problems that the time for the user equipment to obtain the effective system information is prolonged due to the increase of the system information in the related technology, the effectiveness of the resources is reduced and the signaling overhead of the system is increased due to the fact that the base station needs more resources to send the system information are solved, and the effects of more effectively utilizing the resources and reducing the signaling overhead are achieved.
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 block diagram of a hardware configuration of a mobile terminal of a system information determination method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of determining system information according to an embodiment of the present invention;
fig. 3 is a flow diagram of a UE obtaining random access information in accordance with a particular embodiment;
fig. 4 is a flow diagram of a UE obtaining system bandwidth information in accordance with a particular embodiment;
fig. 5 is a block diagram of a system information determination apparatus according to an embodiment of the present invention;
FIG. 6 is a block diagram (one) of the structure of the system information determination module 54 according to an embodiment of the present invention;
fig. 7 is a block diagram (two) of the structure of the determination module 54 in the apparatus for determining system information according to the embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "1", "first", "second", etc. in the description and claims of the present invention and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The method provided by the embodiment of the application can be executed in a mobile terminal, a computer terminal or a similar operation device. Taking an example of the method running on a mobile terminal, fig. 1 is a block diagram of a hardware structure of the mobile terminal according to the method for determining system information in the embodiment of the present invention. As shown in fig. 1, the mobile terminal 10 may include one or more (only one shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data, and a transmitting device 106 for communication functions. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration and is not intended to limit the structure of the electronic device. For example, the mobile terminal 10 may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
The memory 104 may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the method for determining system information in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by executing the software programs and modules stored in the memory 104, so as to implement the method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal 10. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
In this embodiment, a method for determining system information running in the mobile terminal is provided, and fig. 2 is a flowchart of a method according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:
step S202, obtaining at least one cell characteristic information for describing cell characteristics;
step S204, determining system information corresponding to the cell characteristic information according to the acquired cell characteristic information.
In the above embodiments, different system information may correspond to different processing operations, for example, the system information may be used for accessing the network, or may be used for other purposes, such as cell selection/reselection, etc., and the terminal may derive the required system information according to its current requirements.
Through the steps, the problems that the time for the user equipment to obtain the effective system information is prolonged due to the increase of the system information in the related technology, the effectiveness of the resources is reduced and the signaling overhead of the system is increased due to the fact that the base station needs more resources to send the system information are solved, and the effects of more effectively utilizing the resources and reducing the signaling overhead are achieved.
Optionally, the main body of the above steps may be a terminal, but is not limited thereto.
In an optional embodiment, the cell characteristic information includes at least one of: cell identification information, subframe type. In this embodiment, the cell identification information is a cell ID, and the system information may be PRACH configuration information. In this embodiment, the subframe type may be an FDD subframe type or a TDD subframe type.
In an optional embodiment, the system information may include at least one of: random access information, system bandwidth information.
In an optional embodiment, determining, according to the obtained cell characteristic information, random access information corresponding to the cell characteristic information may include: acquiring a configuration index number of a PRACH (random access channel) by a formula (cell ID) mod (N +1), and acquiring a time-frequency resource position for sending a preamble, wherein the cell ID is the cell identifier, and the N is the number of PRACH configurations in a Frequency Division Duplex (FDD) mode or a Time Division Duplex (TDD) mode; and determining the root sequence index number rootsequency index according to the configured index number of the PRACH by the following formula: (rootsequenceindex) ═ cell ID mod (M +1), where M is the total number of root sequences; generating a preamble set according to the rootsequency index; and the time-frequency resource is used for sending one preamble in the preamble set.
In an optional embodiment, determining, according to the obtained cell characteristic information, system bandwidth information corresponding to the cell characteristic information may include: acquiring downlink bandwidth information through a formula int [ cell ID/100], wherein the cell ID is the cell identifier; and acquiring the system index information according to the downlink bandwidth information.
The invention is illustrated below with reference to specific examples:
the first embodiment is as follows:
fig. 3 is a flowchart of the UE obtaining random access information according to the present embodiment, and as shown in fig. 3, the method includes the following steps:
an idle User Equipment (UE) a is turned on, initially accesses to a network, and establishes a connection with the network (i.e., a Radio Resource Control (RRC) connection in Long-Term Evolution (LTE);
1. UE a starts up to search for a frequency point, and after the strongest frequency point is found, searches for a Packet Switching Service (PSS) and a user Service System (SSS) to obtain a physical cell identifier and a subframe type, such as FDD.
2. After obtaining a Physical layer cell identity (cell ID), UE a obtains a Random Access CHannel (PRACH) configuration index number through a formula (cell ID) mod (N +1), thereby obtaining Time-Frequency resource information of preamble, where N represents the number of PRACH configurations in a Frequency Division Duplex (FDD)/Time Division Duplex (TDD) mode.
3. UE a obtains a root sequence index (rootsequency index) (cell ID) mod (M +1), thereby generating a preamble set, where M is the total number of root sequences.
4. And the UE A sends a preamble in a randomly selected and generated preamble set on the acquired time-frequency resources.
5. And the base station monitors the preamble and sends a random access response to the UE to complete the random access process.
The second embodiment is as follows: starting up the UE B to obtain system bandwidth information:
fig. 4 is a flowchart of obtaining system bandwidth information by a UE in this embodiment, and as shown in fig. 4, the method includes the following steps:
1. and starting the UE B to search frequency points, and searching the PSS and the SSS after searching the strongest frequency point to obtain the cell identifier of the physical layer and the subframe type, such as FDD.
2. After obtaining a physical layer cell identity (cell ID), UE B obtains downlink Bandwidth information through a formula int [ cell ID/100], for example, there are 6 Bandwidth types dl-Bandwidth estimated { n6, n15, n25, n50, n75, n100} in LTE, then int [ cell ID/100] ═ 0 represents a first Bandwidth, that is, n6, and int [ cell ID/100] ═ 5 represents a 6 th Bandwidth, that is, n 100.
3. And the UE deduces system bandwidth index information according to the obtained information, and the UE B obtains the system bandwidth information.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a device for accessing a network is further provided, where the device is used to implement the foregoing embodiments and preferred embodiments, and details of the description already made are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 5 is a block diagram illustrating a structure of an apparatus for determining system information according to an embodiment of the present invention, and as shown in fig. 5, the apparatus may include: an acquisition module 52 and a determination module 54, which are described below:
an obtaining module 52, configured to obtain at least one type of cell characteristic information for describing a cell characteristic; a determining module 54, connected to the acquiring module 52, configured to determine, according to the acquired cell characteristic information, system information corresponding to the cell characteristic information.
In an optional embodiment, the cell characteristic information includes at least one of: cell identification information, subframe type.
In an optional embodiment, the system information comprises at least one of: random access information, system bandwidth information.
In an alternative embodiment, fig. 6 is a block diagram (one) of a structure of the determining module 54 of the system information determining apparatus according to an embodiment of the present invention, and as shown in fig. 6, the determining module 54 may include: the first acquisition unit 62, the determination unit 64 and the generation unit 66, the determination module 54 is explained below:
a first obtaining unit 62, configured to obtain a configuration index number of a PRACH (random access channel) through a formula (cell ID) mod (N +1) when determining random access information corresponding to the cell characteristic information according to the obtained cell characteristic information, and obtain a time-frequency resource location for sending a preamble, where the cell ID is the cell identifier, and N is the number of PRACH configurations in an FDD (frequency division duplex) mode or a TDD (time division duplex) mode; a determining unit 64, connected to the first obtaining unit 62, configured to determine, according to the configured index number of the PRACH, an index number rootsequency index of the root sequence by using the following formula: (rootsequenceindex) ═ cell ID mod (M +1), where M is the total number of root sequences; a generating unit 66, connected to the determining unit 64, for generating a preamble set according to the rootsequency index; and the time-frequency resource is used for sending one preamble in the preamble set.
In an alternative embodiment, fig. 7 is a block diagram (ii) of a structure of the determining module 54 of the system information determining apparatus according to an embodiment of the present invention, and as shown in fig. 7, the determining module 54 may include: the second obtaining unit 72 and the third obtaining unit 74, the determining module 54 is explained as follows:
a second obtaining unit 72, configured to obtain downlink bandwidth information through a formula int [ cell ID/100] when determining, according to the obtained cell characteristic information, system bandwidth information corresponding to the cell characteristic information, where the cell ID is the cell identifier; a third obtaining unit 74, connected to the second obtaining unit 72, for obtaining the system index information according to the downlink bandwidth information.
According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the above steps.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for executing the above steps.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Alternatively, in the present embodiment, the processor executes the above steps according to the program code stored in the storage medium.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
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 alternatively, they may 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, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. 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 (8)
1. A method for determining system information, comprising:
acquiring at least one cell characteristic information for describing cell characteristics;
determining system information corresponding to the cell characteristic information according to the acquired cell characteristic information;
determining random access information corresponding to the cell characteristic information according to the acquired cell characteristic information comprises: acquiring a configuration index number of a PRACH (random access channel) by a formula (cell ID) mod (N +1), and acquiring a time-frequency resource position for sending a preamble, wherein the cell ID is the cell identifier, and N is the number of PRACH configurations in a Frequency Division Duplex (FDD) mode or a Time Division Duplex (TDD) mode; the root sequence index rootsequency index is determined by the following formula: (rootsequenceindex) ═ cell ID mod (M +1), where M is the total number of root sequences; generating a preamble set according to the rootsequency index; and the time-frequency resource is used for sending one preamble in the preamble set.
2. The method of claim 1, wherein the cell characteristic information comprises at least one of:
cell identification information, subframe type.
3. The method according to claim 1 or 2, wherein the system information comprises at least one of:
random access information, system bandwidth information.
4. The method of claim 3, wherein determining system bandwidth information corresponding to the cell characteristic information according to the obtained cell characteristic information comprises:
acquiring downlink bandwidth information through a formula int [ cell ID/100], wherein the cell ID is the cell identifier;
and acquiring system index information according to the downlink bandwidth information.
5. An apparatus for determining system information, comprising:
an obtaining module, configured to obtain at least one type of cell feature information used for describing a cell feature;
a determining module, configured to determine, according to the acquired cell characteristic information, system information corresponding to the cell characteristic information;
wherein, when determining the random access information corresponding to the cell characteristic information according to the acquired cell characteristic information, the determining module includes: a first obtaining unit, configured to obtain a configuration index number of a PRACH (random access channel) by a formula (cell ID) mod (N +1), and obtain a time-frequency resource location for sending a preamble, where the cell ID is the cell identifier, and N is the number of PRACH configurations in an FDD (frequency division duplex) mode or a TDD (time division duplex) mode; a determining unit, configured to determine the root sequence index rootsequency index according to the following formula: (rootsequenceindex) ═ cell ID mod (M +1), where M is the total number of root sequences; the generating unit is used for generating a preamble set according to the rootsequency index; and the time-frequency resource is used for sending one preamble in the preamble set.
6. The apparatus of claim 5, wherein the cell characteristic information comprises at least one of:
cell identification information, subframe type.
7. The apparatus of claim 5 or 6, wherein the system information comprises at least one of:
random access information, system bandwidth information.
8. The apparatus of claim 7, wherein when determining system bandwidth information corresponding to the cell characteristic information according to the acquired cell characteristic information, the determining module comprises:
a second obtaining unit, configured to obtain downlink bandwidth information through a formula int [ cell ID/100], where the cell ID is the cell identifier;
and a third obtaining unit, configured to obtain system index information according to the downlink bandwidth information.
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