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 PDF

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Publication number
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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types
basic sequence
sequence combination
descending synchronous
synchronous signal
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CN102752769A (en
Inventor
梁春丽
郝鹏
郁光辉
夏树强
鲁照华
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2012/071666 priority patent/WO2012142874A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements
    • H04L27/2666Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/2605Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607Cyclic extensions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements
    • H04L27/2689Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692Link 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

The indicating means and device of cyclic prefix type in a kind of wireless communication system
Technical field
The present invention relates to Long Term Evolution LAN (LTE-LAN, Advanced Long-Term Evolution Local Area Network) cyclic prefix (CP, Cyclic Prefix) type in technology, more particularly to a kind of wireless communication system Indicating means and device.
Background technology
LTE-LAN is a kind of wireless communication system being applied in WLAN, based on time division duplex (TDD, Time Division Duplex) mode of operation, its basic frame structure as shown in figure 1, a basic frame be divided into descender, up area and Protection band, wherein, descender is used for transmission of downlink signal, and up area is used to transmit upward signal.
When terminal accesses LTE-LAN systems, first, terminal detection descending synchronous signal channel, signal detection, automatic gain are completed Control the work such as (AGC, Auto Gain Control) adjustment, the judgement of CP types, time synchronized and frequency offset correction;Then, eventually End detection broadcast channel (BCH, Broadcast Channel), obtains system information, and system information includes base station or access point The mark of (AP, Access Point), use the configuration informations such as antenna number;Finally, terminal is completed by uplink synchronous channel Up time synchronized, complete all processes of access LTE-LAN systems.Wherein, the position of descending synchronous signal channel and broadcast channel Put as shown in Fig. 2 descending synchronous signal channel and broadcast channel are located at the descender of basic frame, width 20MHz, descender also includes There are other down channels.
LTE-LAN systems can support a variety of CP types, to adapt to different channel conditions.At present, existing CP types Detection has two methods:One kind is blind Detecting, i.e., in access procedure, terminal is synchronized by attempting various CP types respectively The transmission of information, it is that each channel can select according to channel condition the advantages of this method to detect the CP types of synchronizing channel Corresponding CP types, shortcoming is that detection complexity is higher;Another kind is that base station notifies that terminal is currently employed by specific mode CP types, it is not necessary to terminal carries out blind Detecting, and advantage is that detection complexity is low, but before CP types are obtained, receives respectively The signal of channel is required for using most long CP types, can cause the waste of resource, for example, broadcast channel is just needed using fixation Signal transmission is carried out using most long CP types.
The content of the invention
In view of this, it is a primary object of the present invention to provide in a kind of wireless communication system the indicating means of CP types and Device, to solve the problems, such as existing CP type detections method detection complexity height and the wasting of resources.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way:
The invention provides 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, referred to using the basic sequence combination of corresponding current CP types Show current CP types.
In such scheme, the base station is using the basic sequence combination for corresponding to current CP types, by descending same Walk channel and send signal to terminal, be:
When needing to send signal by descending synchronous signal channel, the base station is from the basic sequence for obtaining or being pre-configured with advance In combination and CP type mapping tables, the basic sequence combination of the corresponding current CP types of inquiry, and according to being looked into The basic sequence combination ask sends signal in descending synchronous signal channel to terminal.
In such scheme, the basic sequence combination in the base station using corresponding current CP types, by descending Before synchronizing channel sends signal to terminal, methods described also includes:
Base station determines currently employed CP types according to the channel condition of current area.
In such scheme, the basic sequence combination is the finger of specified quantity, and/or given category basic sequence Determine arrangement mode.
Present invention also offers a kind of instruction device of CP types in wireless communication system, described device includes:Instruction is single Member, for the basic sequence combination using corresponding current CP types, signal is sent by descending synchronous signal channel, instruction is current CP types.
In such scheme, the indicating member, including:Enquiry module and sending module;Wherein,
Enquiry module, for from the basic sequence combination that obtains or be pre-configured with advance and CP type mapping tables In, the basic sequence combination of the corresponding current CP types of inquiry;
Sending module, for the basic sequence combination that is inquired according to the enquiry module descending synchronous signal channel to Terminal sends signal, and current CP types are indicated to the terminal.
In such scheme, the indicating member, in addition to:Acquisition module, and/or configuration module;Wherein,
Acquisition module, for obtaining basic sequence combination and CP type mapping tables in advance;
Configuration module, for being pre-configured with basic sequence combination and CP type mapping tables;
The enquiry module, it is additionally operable to from base that the acquisition module obtains in advance, and/or that configuration module is pre-configured with This combined sequence mode and CP type mapping tables, the basic sequence combination of the corresponding current CP types of inquiry.
In such scheme, described device also includes:Determining unit, for the channel condition according to current area, it is determined that Currently employed CP types;
The indicating member, the basic sequence combination determined using the determining unit is additionally operable to, by descending same Walk channel and send signal, indicate current CP types.
The indicating means and device of CP types, signal is sent by descending synchronous signal channel in the wireless communication system of the present invention When used basic sequence combination instruction CP types so that terminal can be when detecting descending synchronous signal channel, under The combination of basic sequence knows CP types in the signal of row synchronizing channel, and detection complexity is low, it is possible to increase CP types Detection efficiency, and can ensure all channels can according to own channel condition configure corresponding to CP types, so as to effectively Save channel resource.
Brief description of the drawings
Fig. 1 is the structural representation of the basic frames of LTE-LAN;
Fig. 2 is the position view of descending synchronous signal channel and broadcast channel;
Fig. 3 is the composition structural representation of CP type instruction devices in wireless communication system of the present invention;
Fig. 4 is the descending synchronous signal channel time domain beamformer of the embodiment of the present invention one;
Fig. 5 is the descending synchronous signal channel time domain beamformer of the embodiment of the present invention two.
Embodiment
The present invention basic thought be:Base station is referred to by the combination of basic sequence in descending synchronous signal channel to terminal Show currently employed CP types so that terminal can be when detecting descending synchronous signal channel, according to basic in descending synchronous signal channel The combination of sequence knows CP types, completes CP types and judges.
The indicating means of CP types, mainly includes in the wireless communication system of the present invention:Base station is using corresponding current CP classes The basic sequence combination of type, signal is sent by descending synchronous signal channel, indicates CP types.
In particular it is required that when sending signal by descending synchronous signal channel, base station is basic from what is obtained or be pre-configured with advance Combined sequence mode and the basic sequence combination in CP type mapping tables, inquiring corresponding current CP types, and press Signal is sent to terminal in descending synchronous signal channel according to the basic sequence combination inquired, CP classes are indicated to the terminal Type.
Here, basic sequence combination can be pre-configured in base station with CP types mapping table, or can also Basic sequence combination and CP type mapping tables are pre-configured on other network side equipments, base station is from the net Network side apparatus obtains basic sequence combination and CP type mapping tables.
In practical application, descending synchronous signal channel is made up of in time domain multiple, one or more basic sequences.It is described basic Combined sequence mode can be the specified arrangement mode of specified quantity, and/or given category basic sequence.It is for example, described basic Combined sequence mode can be the one or more among seven kinds in table 1 below, wherein, basic sequence A and basic sequence B difference For two kinds of specified basic sequences ,-A represents a phase place to basic sequence A, be i.e. obtained after basic sequence A phase places π The basic sequence arrived ,-B represent a phase place to basic sequence B, be i.e. obtained after basic sequence B-phase rotation π basic Sequence phase.For example, the basic sequence combination that numbering is 1, which is the one kind for specifying 10 specified basic sequence A, specifies arrangement Mode, the basic sequence combination that numbering is 6 are specified 10, specifying basic sequence A and basic sequence B, a kind of specify Arrangement mode.Here, the basic sequence A specified, and/or the basic sequence B specified temporal duration can be 0.4us, Or 0.8us or 1.6us.
Basic sequence combination is numbered Basic sequence combination
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, base station is obtained ahead of time or configured basic sequence combination and CP types are one-to-one basic sequence groups Conjunction mode and CP type mapping tables, in currently used CP Class1, base station can be with the basic sequence of corresponding CP Class1 Combination 1, signal is sent in descending synchronous signal channel;In currently used CP types 2, base station can be with corresponding CP types 2 Basic sequence combination 2, signal is sent in descending synchronous signal channel;In currently used CP types M, base station can be with corresponding CP Type M basic sequence combination M, signal is sent in descending synchronous signal channel, wherein, M represents the species number of CP types.
Here, the basic sequence combination in the base station using corresponding current CP types, passes through descending synchronous signal channel Before sending signal to terminal, methods described also includes:Base station determines currently employed CP according to the channel condition of current area Type.
Here, the channel condition of the cell can include the parameters such as the delay spread of channel.
Accordingly, present invention also offers a kind of instruction device of CP types in wireless communication system, as shown in figure 1, institute Stating device includes:Indicating member 11, for the basic sequence combination using corresponding current CP types, believed by down-going synchronous Road sends signal, indicates current CP types.
Wherein, the indicating member 11, including:Enquiry module 111 and sending module 112;Wherein, enquiry module 111, use In from the basic sequence combination for obtaining or being pre-configured with advance and CP type mapping tables, inquiry corresponds to current CP classes The basic sequence combination of type;Sending module 112, for the basic sequence combination inquired according to the enquiry module 111 Mode sends signal in descending synchronous signal channel to terminal, and current CP types are indicated to the terminal.
Here, the indicating member 111 can also include:Acquisition module 113, and/or configuration module 114;Wherein, obtain Module 113, for obtaining basic sequence combination and CP type mapping tables in advance;Configuration module 114, with 0 in advance Configure basic sequence combination and CP type mapping tables;The enquiry module, it is additionally operable to pre- from the acquisition module 113 The basic sequence combination that first obtain, and/or configuration module 114 is pre-configured with and CP type mapping tables, inquiry pair Should before CP types basic sequence combination.
In practical application, acquisition module 113 can the basic sequence combination is corresponding with CP types to close from being stored with It is the network side equipment of table, obtains basic sequence combination and CP type mapping tables.
In addition, described device can also include:Determining unit 12, for the channel condition according to current area, it is determined that working as The CP types of preceding use.Here, the indicating member 11, it is additionally operable to the basic sequence combination determined using the determining unit 12 Mode, signal is sent by descending synchronous signal channel, indicates current CP types.
Embodiment one
In the present embodiment, by 10 base station sequence A 3 kinds of combinations, 3 kinds of CP types are represented.Specifically, such as Fig. 4 It is shown, basic sequence combination one:A, A, A, A, A, A, A, A, A, A, corresponding CP Class1;Basic sequence combination two: A ,-A, A ,-A, A ,-A, A ,-A, A ,-A, corresponding CP types 2;Basic sequence combination three:A ,-A, A ,-A ,-A, A ,-A, A ,- A ,-A, CP types 3 are represented, wherein, basic sequence A duration is 0.8us, the synchronous letter being made up of 10 basic sequence A Number duration is 8us.
In the present embodiment, base station indicates the process of CP types to terminal, specifically may comprise steps of:
Step 1:Above-mentioned 10 base station sequence A 3 kinds of combinations and the corresponding pass of 3 kinds of CP types are configured in base station in advance It is table;
Step 2:Base station configures the CP types of each channel according to the channel condition of each channel;
Step 3:When needing to send signal by descending synchronous signal channel, base station inquires according to the CP types being currently configured Basic sequence combining form corresponding to the CP types, using the basic sequence combining form inquired, believe in down-going synchronous Road sends signal.
For example, if the CP types of base station configuration are CP types 3, base station can inquire corresponding basic sequence combination shape Formula is above-mentioned basic sequence combining form three, then using above-mentioned basic sequence combining form three, is sent out in descending synchronous signal channel The number of delivering letters.
In this way, terminal after the descending synchronous signal channel signal is received, parses the descending synchronous signal channel signal, obtained To the basic sequence combining form in the descending synchronous signal channel signal, from the basic sequence combination for obtaining or being pre-configured with advance Mode and CP type mapping tables, inquire about CP classes corresponding to basic sequence combining form in the descending synchronous signal channel signal Type, obtain the CP types of descending synchronous signal channel.
In practical application, terminal can obtain basic sequence combination and CP type mapping tables from base station, or It can also be obtained from other network side equipments for being stored with the basic sequence combination and CP type mapping tables, or Basic sequence combination and CP type mapping tables can also be configured directly in the terminal.
Embodiment 2
In the present embodiment, pass through two kinds of basic sequences of base station sequence A and basic sequence B and 10 basic sequences altogether 3 kinds of combinations, represent 3 kinds of CP types.
Specifically, as shown in figure 5, basic sequence combining form one:A, A, A, A, A, A, A, A, A ,-A, represent CP Class1; Basic sequence combining form two:A ,-A, A ,-A ,-A, B, B, B, B ,-B, represent CP types 2;Basic sequence combining form three:A, A, A, A ,-A, B, B, B, B ,-B, CP types 3 are represented, wherein, basic sequence A and basic sequence B duration are 0.8us, Be made up of 10, basic sequence A and basic sequence B, the synchronizing signal duration is 8us.Wherein ,-A is basic sequence A phases Basic sequence after position rotation π ,-B are that basic sequence B-phase rotates the basic sequence after π.
In the present embodiment, the process of CP type instructions is carried out, specifically may comprise steps of:
Step 1:Base station obtains the mapping table of above-mentioned 10 base station sequence A 3 kinds of combinations and 3 kinds of CP types;
Step 2-3:It is identical with the step 2-3 in embodiment one, except that, base station is sent on descending synchronous signal channel During signal, used basic sequence combination is 3 kinds of combinations from 10 base station sequence A and basic sequence B as shown in Figure 5 Mode, the mapping table with 3 kinds of CP types, inquiry obtain basic sequence combination used by transmission signal.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (7)

1. the indicating means of cyclic prefix (CP) type in a kind of wireless communication system, it is characterised in that methods described includes:
Base station sends signal, instruction is worked as using the basic sequence combination of corresponding current CP types by descending synchronous signal channel Preceding CP types;
The descending synchronous signal channel is made up of in time domain multiple, one or more basic sequences;The basic sequence combination side Formula is the specified arrangement mode of specified quantity, and/or given category basic sequence.
2. according to claim 1 in wireless communication system CP types indicating means, it is characterised in that the base station uses The basic sequence combination of corresponding current CP types, signal is sent to terminal by descending synchronous signal channel, is:
When needing to send signal by descending synchronous signal channel, the base station is combined from the basic sequence for obtaining or being pre-configured with advance In mode and CP type mapping tables, the basic sequence combination of the corresponding current CP types of inquiry, and according to being inquired Basic sequence combination descending synchronous signal channel to terminal send signal.
3. according to claim 1 in wireless communication system CP types indicating means, it is characterised in that adopted in the base station With the basic sequence combination of corresponding current CP types, before sending signal to terminal by descending synchronous signal channel, the side Method also includes:
Base station determines currently employed CP types according to the channel condition of current area.
4. the instruction device of CP types in a kind of wireless communication system, it is characterised in that described device includes:Indicating member, use In the basic sequence combination using corresponding current CP types, signal is sent by descending synchronous signal channel, indicates current CP classes Type;The descending synchronous signal channel is made up of in time domain multiple, one or more basic sequences;The basic sequence combination It is the specified arrangement mode of specified quantity, and/or given category basic sequence.
5. according to claim 4 in wireless communication system CP types instruction device, it is characterised in that the instruction is single Member, including:Enquiry module and sending module;Wherein,
Enquiry module, for from the basic sequence combination that obtains or be pre-configured with advance with CP type mapping tables, The basic sequence combination of the corresponding current CP types of inquiry;
Sending module, for the basic sequence combination that is inquired according to the enquiry module in descending synchronous signal channel to terminal Signal is sent, current CP types are indicated to the terminal.
6. according to claim 5 in wireless communication system CP types instruction device, it is characterised in that the instruction is single Member, in addition to:Acquisition module, and/or configuration module;Wherein,
Acquisition module, for obtaining basic sequence combination and CP type mapping tables in advance;
Configuration module, for being pre-configured with basic sequence combination and CP type mapping tables;
The enquiry module, it is additionally operable to from basic sequence that the acquisition module obtains in advance, and/or that configuration module is pre-configured with Row combination and CP type mapping tables, the basic sequence combination of the corresponding current CP types of inquiry.
7. according to the instruction device of CP types in any one of claim 4 to 6 wireless communication system, it is characterised in that institute Stating device also includes:Determining unit, for the channel condition according to current area, determine currently employed CP types;
The indicating member, the basic sequence combination determined using the determining unit is additionally operable to, is believed by down-going synchronous Road sends signal, indicates current CP types.
CN201110097762.4A 2011-04-19 2011-04-19 The indicating means and device of cyclic prefix type in a kind of wireless communication system Expired - Fee Related CN102752769B (en)

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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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CN104685848A (en) * 2013-09-29 2015-06-03 华为技术有限公司 Information sending method and cp type determination method
WO2015109513A1 (en) 2014-01-24 2015-07-30 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

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