CN102752769B - The indicating means and device of cyclic prefix type in a kind of wireless communication system - Google Patents
The indicating means and device of cyclic prefix type in a kind of wireless communication system Download PDFInfo
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- CN102752769B CN102752769B CN201110097762.4A CN201110097762A CN102752769B CN 102752769 B CN102752769 B CN 102752769B CN 201110097762 A CN201110097762 A CN 201110097762A CN 102752769 B CN102752769 B CN 102752769B
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- 238000004891 communication Methods 0.000 title claims abstract description 20
- 125000004122 cyclic group Chemical group 0.000 title claims description 4
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000001360 synchronised effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 abstract description 12
- 239000013256 coordination polymer Substances 0.000 abstract 8
- 238000010586 diagram Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of indicating means of CP types in wireless communication system, methods described includes：Base station is sent signal by descending synchronous signal channel, is indicated current CP types using the basic sequence combination of corresponding current CP types.The invention also discloses a kind of instruction device of CP types in wireless communication system, used basic sequence combination indicates CP types when sending signal by descending synchronous signal channel, enable the terminal to when detecting descending synchronous signal channel, CP types are known according to the combination of basic sequence in the signal of descending synchronous signal channel, detection complexity is low, the detection efficiency of CP types can be improved, and can ensure all channels can according to corresponding to configuring own channel condition CP types, so as to effectively saving channel resource.
Description
Technical Field
The invention relates to a Long Term Evolution local area Network (LTE-LAN) technology, in particular to a method and a device for indicating a Cyclic Prefix (CP) type in a wireless communication system.
Background
An LTE-LAN is a wireless communication system applied in a wireless local area network, and is based on a Time Division Duplex (TDD) operation mode, and a basic frame structure of the LTE-LAN is as shown in fig. 1, where a basic frame is divided into a downlink region, an uplink region and a guard band, where the downlink region is used for transmitting downlink signals, and the uplink region is used for transmitting uplink signals.
When a terminal accesses an LTE-LAN system, firstly, the terminal detects a downlink synchronous channel to complete the work of signal detection, Automatic Gain Control (AGC) adjustment, CP type judgment, time synchronization, frequency offset correction and the like; then, the terminal detects a Broadcast Channel (BCH) to obtain system information, where the system information includes configuration information such as an identifier of a base station or an Access Point (AP), the number of used antennas, and the like; and finally, the terminal completes uplink time synchronization through the uplink synchronization channel and completes the whole process of accessing the LTE-LAN system. The positions of the downlink synchronization channel and the broadcast channel are shown in fig. 2, the downlink synchronization channel and the broadcast channel are located in a downlink region of the basic frame, the width of the downlink synchronization channel and the broadcast channel is 20MHz, and the downlink region further includes other downlink channels.
The LTE-LAN system may support multiple CP types to accommodate different channel conditions. Currently, there are two methods for existing CP type detection: one is blind detection, that is, in the access process, the terminal detects the CP type of the synchronization channel by respectively trying various CP types to transmit the synchronization information, the method has the advantages that each channel can select the corresponding CP type according to the channel condition, and the defect is high detection complexity; the other is that the base station notifies the terminal of the currently used CP type in a specific manner, and the terminal is not required to perform blind detection, which has the advantage of low detection complexity, but before the CP type is obtained, the received signals of each channel all need to use the longest CP type, which may cause waste of resources, for example, the broadcast channel needs to use the CP type that is fixedly used longest for signal transmission.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for indicating a CP type in a wireless communication system, so as to solve the problems of high detection complexity and resource waste of the existing CP type detection method.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for indicating a CP type in a wireless communication system, which comprises the following steps:
the base station adopts a basic sequence combination mode corresponding to the current CP type, and sends signals through a downlink synchronous channel to indicate the current CP type.
In the above solution, the base station sends a signal to the terminal through the downlink synchronization channel in a basic sequence combination manner corresponding to the current CP type, where the basic sequence combination manner is:
when a signal needs to be sent through the downlink synchronization channel, the base station queries a basic sequence combination mode corresponding to the current CP type from a pre-acquired or pre-configured basic sequence combination mode and CP type corresponding relation table, and sends the signal to the terminal on the downlink synchronization channel according to the queried basic sequence combination mode.
In the above solution, before the base station sends a signal to the terminal through the downlink synchronization channel in a basic sequence combination manner corresponding to the current CP type, the method further includes:
and the base station determines the currently adopted CP type according to the channel condition of the current cell.
In the above scheme, the basic sequence combination manner is a specified number and/or a specified arrangement manner of specified kinds of basic sequences.
The present invention also provides an apparatus for indicating a CP type in a wireless communication system, the apparatus comprising: and the indicating unit is used for sending a signal through the downlink synchronous channel by adopting a basic sequence combination mode corresponding to the current CP type and indicating the current CP type.
In the foregoing aspect, the indicating unit includes: the system comprises a query module and a sending module; wherein,
the query module is used for querying the basic sequence combination mode corresponding to the current CP type from a pre-acquired or pre-configured basic sequence combination mode and CP type corresponding relation table;
and the sending module is used for sending a signal to the terminal in a downlink synchronous channel according to the basic sequence combination mode inquired by the inquiring module and indicating the current CP type to the terminal.
In the foregoing solution, the indicating unit further includes: an acquisition module and/or a configuration module; wherein,
the acquisition module is used for acquiring a corresponding relation table of the basic sequence combination mode and the CP type in advance;
the configuration module is used for pre-configuring a corresponding relation table of the basic sequence combination mode and the CP type;
the query module is further configured to query the basic sequence combination mode corresponding to the current CP type from the table of correspondence between the basic sequence combination mode and the CP type, which is obtained in advance by the obtaining module and/or is configured in advance by the configuration module.
In the above solution, the apparatus further comprises: a determining unit, configured to determine a currently-used CP type according to a channel condition of a current cell;
the indicating unit is further configured to send a signal through a downlink synchronization channel in the basic sequence combination manner determined by the determining unit to indicate the current CP type.
The method and the device for indicating the CP type in the wireless communication system indicate the CP type through the basic sequence combination mode adopted when the downlink synchronous channel sends the signal, so that the terminal can acquire the CP type according to the basic sequence combination mode in the signal of the downlink synchronous channel when detecting the downlink synchronous channel, the detection complexity is low, the detection efficiency of the CP type can be improved, and all channels can be ensured to be configured with the corresponding CP type according to the self channel condition, thereby effectively saving channel resources.
Drawings
FIG. 1 is a schematic structural diagram of an LTE-LAN basic frame;
fig. 2 is a schematic diagram of the positions of a downlink synchronization channel and a broadcast channel;
FIG. 3 is a schematic diagram of the structure of a CP type indicating device in the wireless communication system according to the present invention;
fig. 4 is a time domain waveform diagram of a downlink synchronization channel according to a first embodiment of the present invention;
fig. 5 is a time domain waveform diagram of a downlink synchronization channel according to a second embodiment of the present invention.
Detailed Description
The basic idea of the invention is: the base station indicates the currently adopted CP type to the terminal through the combination mode of the basic sequence in the downlink synchronous channel, so that the terminal can acquire the CP type according to the combination mode of the basic sequence in the downlink synchronous channel when detecting the downlink synchronous channel, and the CP type judgment is completed.
The method for indicating the CP type in the wireless communication system mainly comprises the following steps: the base station adopts a basic sequence combination mode corresponding to the current CP type, and sends signals through a downlink synchronous channel to indicate the CP type.
Specifically, when a signal needs to be sent through the downlink synchronization channel, the base station queries the basic sequence combination mode corresponding to the current CP type from the table of correspondence between the basic sequence combination mode and the CP type, which is obtained in advance or configured in advance, sends the signal to the terminal on the downlink synchronization channel according to the queried basic sequence combination mode, and indicates the CP type to the terminal.
Here, the correspondence table between the base sequence combination scheme and the CP type may be configured in advance in the base station, or the correspondence table between the base sequence combination scheme and the CP type may be configured in advance in another network side device, and the base station acquires the correspondence table between the base sequence combination scheme and the CP type from the network side device.
In practical application, the downlink synchronization channel is composed of a plurality of, one or more than one basic sequence in time domain. The basic sequence combination mode can be a specified number and/or a specified arrangement mode of the basic sequences of a specified kind. For example, the basic sequence combination mode may be one or more of seven in the following table 1, where the basic sequence a and the basic sequence B are respectively two basic sequences specified, a represents a phase rotation for the basic sequence a, that is, a basic sequence obtained by phase-rotating the basic sequence a by pi, and B represents a phase rotation for the basic sequence B, that is, a basic sequence phase obtained by phase-rotating the basic sequence B by pi. For example, the base sequence combination method numbered 1 is a designated arrangement method in which 10 designated base sequences a are designated, and the base sequence combination method numbered 6 is a designated arrangement method in which 10 designated base sequences a and base sequences B are designated. Here, the time domain duration of the specified base sequence a, and/or the specified base sequence B may be 0.4us, or 0.8us, or 1.6 us.
| Numbering of base sequence combinations | Basic sequence combination mode |
| 1 | A，A，A，A，A，A，A，A，A，A |
| 2 | A，A，A，A，A，A，A，A，A，-A |
| 3 | A，-A，A，-A，A，-A，A，-A，A，-A |
| 4 | A，-A，A，-A，-A，A，-A，A，-A，-A |
| 5 | A，A，A，A，-A |
| 6 | A，A，A，A，-A，B，B，B，B，-B |
| 7 | A，-A，A，-A，-A，B，B，B，B，-B |
TABLE 1
For example, the base station obtains or configures a table of correspondence between the CP type and the basic sequence combination manner that corresponds to the CP type one by one in advance, and when the CP type 1 is currently used, the base station may send a signal on a downlink synchronization channel in the basic sequence combination manner 1 corresponding to the CP type 1; when the CP type 2 is currently used, the base station may transmit a signal in a downlink synchronization channel in a basic sequence combination mode 2 corresponding to the CP type 2; when the CP type M is currently used, the base station may transmit a signal on a downlink synchronization channel in a basic sequence combination manner M corresponding to the CP type M, where M represents the number of types of the CP type.
Here, before the base station transmits a signal to the terminal through the downlink synchronization channel in a basic sequence combination manner corresponding to the current CP type, the method further includes: and the base station determines the currently adopted CP type according to the channel condition of the current cell.
Here, the channel condition of the cell may include parameters such as delay spread of a channel.
Accordingly, the present invention also provides an apparatus for indicating a CP type in a wireless communication system, as shown in fig. 1, the apparatus comprising: an indicating unit 11, configured to send a signal through a downlink synchronization channel in a basic sequence combination manner corresponding to the current CP type, to indicate the current CP type.
Wherein, the indicating unit 11 includes: a query module 111 and a sending module 112; the query module 111 is configured to query a basic sequence combination mode corresponding to the current CP type from a pre-obtained or pre-configured basic sequence combination mode and CP type correspondence table; a sending module 112, configured to send a signal to a terminal in a downlink synchronization channel according to the basic sequence combination manner queried by the querying module 111, and indicate the current CP type to the terminal.
Here, the indication unit 111 may further include: an acquisition module 113, and/or a configuration module 114; the obtaining module 113 is configured to obtain a correspondence table between a basic sequence combination manner and a CP type in advance; a configuration module 114, configured with 0 for pre-configuring the table of correspondence between the basic sequence combination mode and the CP type; the query module is further configured to query the basic sequence combination mode corresponding to the current CP type from the table of correspondence between the basic sequence combination mode and the CP type, which is obtained in advance by the obtaining module 113 and/or is configured in advance by the configuring module 114.
In practical applications, the obtaining module 113 may obtain the correspondence table between the basic sequence combination manner and the CP type from the network side device in which the correspondence table between the basic sequence combination manner and the CP type is stored.
Further, the apparatus may further include: a determining unit 12, configured to determine a currently used CP type according to a channel condition of a current cell. Here, the indicating unit 11 is further configured to transmit a signal through a downlink synchronization channel by using the basic sequence combination method determined by the determining unit 12, so as to indicate the current CP type.
Example one
In this embodiment, 3 CP types are represented by 3 combination modes of 10 base station sequences a. Specifically, as shown in fig. 4, the first basic sequence combination method: a, A, A, A, A, A, corresponding to CP type 1; and a second basic sequence combination mode: a, -A, A, -A, A, -A, A, -A, A, -A, corresponding to CP type 2; basic sequence combination mode three: a, -a, -a, representing CP type 3, wherein the duration of the base sequence a is 0.8us and the duration of the synchronization signal consisting of 10 base sequences a is 8 us.
In this embodiment, the process of indicating the CP type to the terminal by the base station may specifically include the following steps:
step 1: configuring a corresponding relation table of 3 combination modes of the 10 base station sequences A and 3 CP types in a base station in advance;
step 2: the base station configures the CP type of each channel according to the channel condition of each channel;
and step 3: when a signal needs to be sent through a downlink synchronization channel, a base station queries a basic sequence combination form corresponding to a CP type according to the currently configured CP type, and sends the signal on the downlink synchronization channel by adopting the queried basic sequence combination form.
For example, if the CP type configured by the base station is CP type 3, the base station may query that the corresponding basic sequence combination form is the above basic sequence combination form three, and transmit a signal on the downlink synchronization channel by using the above basic sequence combination form three.
Thus, after receiving the downlink synchronization channel signal, the terminal analyzes the downlink synchronization channel signal to obtain a basic sequence combination form in the downlink synchronization channel signal, and queries a CP type corresponding to the basic sequence combination form in the downlink synchronization channel signal from a pre-obtained or pre-configured table of correspondence between the basic sequence combination form and the CP type to obtain the CP type of the downlink synchronization channel.
In practical application, the terminal may obtain the correspondence table between the basic sequence combination manner and the CP type from the base station, or may also obtain the correspondence table between the basic sequence combination manner and the CP type from other network side devices in which the correspondence table between the basic sequence combination manner and the CP type is stored, or may also directly configure the correspondence table between the basic sequence combination manner and the CP type on the terminal.
Example 2
In this embodiment, 3 CP types are represented by two basic sequences, i.e., a base station sequence a and a basic sequence B, and 3 combinations of 10 basic sequences in total.
Specifically, as shown in fig. 5, the basic sequence combination form one: a, A, A, A, A, A, A, A, A, -A, representing CP type 1; basic sequence combination type two: a, -A, A, -A, -A, B, B, B, B, -B, representing CP type 2; basic sequence combination type three: a, A, A, A, -A, B, B, B, B, -B, representing CP type 3, wherein the duration of both base sequence A and base sequence B is 0.8us, and the duration of the synchronization signal, consisting of 10 base sequences A and B, is 8 us. Wherein, -A is the basic sequence after the phase of the basic sequence A is rotated by pi, -B is the basic sequence after the phase of the basic sequence B is rotated by pi.
In this embodiment, the process of performing CP type indication may specifically include the following steps:
step 1: the base station acquires a corresponding relation table of 3 combination modes of the 10 base station sequences A and 3 CP types;
step 2-3: the same as step 2-3 in the first embodiment, except that, when the base station transmits a signal on the downlink synchronization channel, the base sequence combination method used by the base station is obtained by querying the correspondence table between 3 combination methods of 10 base station sequences a and B and 3 CP types as shown in fig. 5.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A method for indicating a Cyclic Prefix (CP) type in a wireless communication system, the method comprising:
the base station adopts a basic sequence combination mode corresponding to the current CP type, and sends signals through a downlink synchronous channel to indicate the current CP type;
the downlink synchronous channel consists of a plurality of basic sequences and one or more basic sequences in a time domain; the basic sequence combination mode is a specified arrangement mode of a specified number and/or a specified kind of basic sequences.
2. The method for indicating the CP type in the wireless communication system according to claim 1, wherein the base station sends a signal to the terminal through the downlink synchronization channel in a basic sequence combination manner corresponding to the current CP type, and the method comprises:
when a signal needs to be sent through the downlink synchronization channel, the base station queries a basic sequence combination mode corresponding to the current CP type from a pre-acquired or pre-configured basic sequence combination mode and CP type corresponding relation table, and sends the signal to the terminal on the downlink synchronization channel according to the queried basic sequence combination mode.
3. The method for indicating a CP type in a wireless communication system according to claim 1, wherein before the base station transmits a signal to the terminal through the downlink synchronization channel in a basic sequence combination manner corresponding to a current CP type, the method further comprises:
and the base station determines the currently adopted CP type according to the channel condition of the current cell.
4. An apparatus for indicating a CP type in a wireless communication system, the apparatus comprising: an indication unit, configured to send a signal through a downlink synchronization channel in a basic sequence combination manner corresponding to a current CP type, and indicate the current CP type; the downlink synchronous channel consists of a plurality of basic sequences and one or more basic sequences in a time domain; the basic sequence combination mode is a specified arrangement mode of a specified number and/or a specified kind of basic sequences.
5. The apparatus for indicating the CP type in the wireless communication system according to claim 4, wherein the indicating unit comprises: the system comprises a query module and a sending module; wherein,
the query module is used for querying the basic sequence combination mode corresponding to the current CP type from a pre-acquired or pre-configured basic sequence combination mode and CP type corresponding relation table;
and the sending module is used for sending a signal to the terminal in a downlink synchronous channel according to the basic sequence combination mode inquired by the inquiring module and indicating the current CP type to the terminal.
6. The apparatus for indicating a CP type in a wireless communication system according to claim 5, wherein the indicating unit further comprises: an acquisition module and/or a configuration module; wherein,
the acquisition module is used for acquiring a corresponding relation table of the basic sequence combination mode and the CP type in advance;
the configuration module is used for pre-configuring a corresponding relation table of the basic sequence combination mode and the CP type;
the query module is further configured to query the basic sequence combination mode corresponding to the current CP type from the table of correspondence between the basic sequence combination mode and the CP type, which is obtained in advance by the obtaining module and/or is configured in advance by the configuration module.
7. The apparatus for indicating a CP type in a wireless communication system according to any of claims 4 to 6, wherein the apparatus further comprises: a determining unit, configured to determine a currently-used CP type according to a channel condition of a current cell;
the indicating unit is further configured to send a signal through a downlink synchronization channel in the basic sequence combination manner determined by the determining unit to indicate the current CP type.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110097762.4A CN102752769B (en) | 2011-04-19 | 2011-04-19 | The indicating means and device of cyclic prefix type in a kind of wireless communication system |
| PCT/CN2012/071666 WO2012142874A1 (en) | 2011-04-19 | 2012-02-27 | Method and apparatus for indicating cyclic prefix type in wireless communication system |
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| CN201110097762.4A CN102752769B (en) | 2011-04-19 | 2011-04-19 | The indicating means and device of cyclic prefix type in a kind of wireless communication system |
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| CN102752769A CN102752769A (en) | 2012-10-24 |
| CN102752769B true CN102752769B (en) | 2018-02-09 |
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| CN201110097762.4A Expired - Fee Related CN102752769B (en) | 2011-04-19 | 2011-04-19 | The indicating means and device of cyclic prefix type in a kind of wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014110815A1 (en) | 2013-01-18 | 2014-07-24 | 华为技术有限公司 | Detection method, transmission method and apparatus for common control channel |
| WO2015042916A1 (en) * | 2013-09-29 | 2015-04-02 | 华为技术有限公司 | Information sending method and cp type determination method |
| CN106061572A (en) | 2014-01-24 | 2016-10-26 | 华为技术有限公司 | Information transmission method, user equipment and base station |
| EP3509259B1 (en) * | 2016-09-26 | 2023-05-03 | Huawei Technologies Co., Ltd. | Method and device for transmitting parameter set of cell |
| CN108282430B (en) * | 2017-01-05 | 2021-01-01 | 华为技术有限公司 | Method for configuring cyclic prefix CP type, terminal equipment and network equipment |
| CN109151846B (en) * | 2017-06-16 | 2020-09-11 | 华为技术有限公司 | CP type determination method, terminal device and base station |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005477A (en) * | 2007-01-04 | 2007-07-25 | 中兴通讯股份有限公司 | Synchronous signal sending and detecting method for orthogonal frequency division complex system |
| WO2010145861A1 (en) * | 2009-06-19 | 2010-12-23 | Alcatel Lucent | Joint processing of uplink data in a wireless communication network |
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| JP4463780B2 (en) * | 2005-06-14 | 2010-05-19 | 株式会社エヌ・ティ・ティ・ドコモ | Transmitting apparatus and transmitting method |
| CN100556195C (en) * | 2007-04-29 | 2009-10-28 | 中兴通讯股份有限公司 | The detection of time division duplexing system circulation prefix types and cell initial search method |
| CN101656700B (en) * | 2008-08-19 | 2013-03-20 | 中兴通讯股份有限公司 | Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system |
| CN101729138B (en) * | 2008-10-15 | 2013-05-08 | 电信科学技术研究院 | Uplink and downlink transmission method, base station and user equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005477A (en) * | 2007-01-04 | 2007-07-25 | 中兴通讯股份有限公司 | Synchronous signal sending and detecting method for orthogonal frequency division complex system |
| WO2010145861A1 (en) * | 2009-06-19 | 2010-12-23 | Alcatel Lucent | Joint processing of uplink data in a wireless communication network |
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| WO2012142874A1 (en) | 2012-10-26 |
| CN102752769A (en) | 2012-10-24 |
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