CN105451302B - Synchronous method and device is realized in wireless network - Google Patents
Synchronous method and device is realized in wireless network Download PDFInfo
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- CN105451302B CN105451302B CN201511031194.2A CN201511031194A CN105451302B CN 105451302 B CN105451302 B CN 105451302B CN 201511031194 A CN201511031194 A CN 201511031194A CN 105451302 B CN105451302 B CN 105451302B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Abstract
The invention discloses realize synchronous method in a kind of wireless network, during accessing wireless network, including finding physical frame on sub-channels, parse the system information channel SICH and control channel CCH in the physical frame searched out, using parsing as a result, obtaining systematic parameter from physical frame；Wherein, the SICH indicates the structure of the physical frame, the distribution of the CCH instructions system resource；A sub-channels are selected from the subchannel for obtained systematic parameter；Physical frame is continually looked in the subchannel selected, parses SICH and CCH in the physical frame searched out, BCF is detected from the physical frame searched out using analysis result, to obtain systematic parameter.It is synchronous with holding that acquisition is realized for the dynamically configurable situation of frame structure.
Description
It is on March 7th, 2012 that the application, which is application No. is the 201280012764.1, applying date, entitled " for accessing nothing
The divisional application of the Chinese invention patent application of the method and device of gauze network ".
Technical field
The invention belongs to realize synchronous method and device in wireless communication field more particularly to a kind of wireless network.
Background technology
In recent years, wireless communication system rapidly develops, such as wireless local area network technology WiFi, base based on 802.11 standards
Bluetooth (Bluetooth) system in 802.15 and the Femto towards indoor application that is derived by mobile communication system
Technology etc. is obtained for and is widely applied.
It is to use a kind of most wide wireless network transmission technology now based on 802.11 WiFi technology.Due to WiFi system
Use carrier sense/conflict avoidance (CSMA/CA, Carrier Sense MultipleAccess with
CollisionAvoidance) mechanism, system effectiveness is relatively low, larger to waste of radio resources.Lead to the basic original of this problem
It is a kind of random multi-access channel mechanism competition-based, central access point (CAP, Access Point) because being CSMA/CA mechanism
Between website (STA, Station), or difference STA, the right to use of radio resource can be competed by CSMA/CA mechanism, together
Shi Jingzheng wireless channels, just collide at this time, lead to the waste of radio resource.In order to avoid collision, the requirement of CSMA/CA mechanism
CAP or STA needs random back when competing wireless channel, when all CAP and STA keep out of the way, though wireless channel is available free,
But and be not used by, this is also the significant wastage to wireless channel.802.11 system effectivenesies are relatively low due to the above reasons,.Such as：
802.11g system physical layers peak rate is up to 54Mbps, but TCP layer achievable rate under big data packet downloading service is not higher than
30Mbps.Although there are disadvantages mentioned above, 802.11 systems are flexible, do not depend on centralized control mechanism, thus can also realize compared with
Low equipment cost.
Femto technologies based on 3GPP standards be from mobile communication system evolution come it is a kind of towards the new of in-door covering
Technology.Based on the data statistics to 3G systems, about 70% data service all occurs indoors, therefore indoor high-speed rate data
Access scheme is with regard to particularly important.The base stations Femto, referred to as femto base station, compact (approximate with Wi-Fi), deployment are flexible.Due to
From mobile communication system evolution, the base stations Femto almost inherit all features of mobile communication system.Femto equipment is only
It is to combine its limited coverage area, the application scenarios feature such as less accessing user to reduce equipment disposal ability, and then drop
Low equipment cost.Consider from duplex mode, identical as mobile communication system, the base stations Femto can be divided into FDD and TDD two classes duplexs
Mechanism.FDD uplink and downlink carrier resources are symmetrical, and the asymmetrical service feature of data service uplink and downlink data traffic makes FDD systems
There are certain wastings of resources when system is in face of data service.TDD system uplink downlink is operated on same carrier wave, passes through division
Time resource is that uplink downlink distributes different radio resources, therefore can preferably be adapted to uplink and downlink business demand compared with FDD
Asymmetrical data service.However, the TDD duplex modes of mobile communication system (including Femto systems), uplink and downlink resource is static
Distribution, the Various types of data business different in face of demand, such as：Browse webpage, mobile video, moving game etc., it is difficult to realize industry
The dynamic adaptation that business demand is divided with resource.Compared with Wi-Fi, since Femto uses the centralized control mechanism based on scheduling,
It is not present between base station or CAP and terminal or terminal and conflicts and waste of radio resources caused by random back due to competing, because
This link efficiency is higher.
For wireless communication system, there is the demand of access wireless network.
Invention content
In view of this, it is an object of the present invention to provide synchronous method and device is realized in wireless network, for connecing
During entering wireless network, the dynamically configurable situation reality of Physical Frame Structure cannot be directed to solve to exist in the prior art
Now synchronous problem.
In order to the embodiment to disclosure some aspects there are one basic understanding, simple summary is shown below.It should
Summarized section is not extensive overview, nor to determine key/critical component or describe the protection domain of these embodiments.
Its sole purpose is that some concepts are presented with simple form, in this, as the preamble of following detailed description.
The embodiment of the present invention provides in a kind of wireless network and realizes synchronous method, the process for accessing wireless network
In, including：
Physical frame is found on sub-channels, parses system information channel SICH and control channel in the physical frame searched out
CCH, using parsing as a result, obtaining systematic parameter from physical frame；Wherein, the SICH indicates the structure of the physical frame,
The distribution of the CCH instructions system resource；
A sub-channels are selected from the subchannel for obtained systematic parameter；
Physical frame is continually looked in the subchannel selected, parses SICH and CCH in the physical frame searched out, is utilized
Analysis result detects BCF from the physical frame searched out, to obtain systematic parameter.
In some optional embodiments, the process that systematic parameter is obtained from physical frame specifically includes：
Physical frame is found on current sub-channel, is parsed SICH and CCH in the physical frame searched out, is utilized the knot of parsing
Fruit obtains systematic parameter from physical frame；
After obtaining systematic parameter, it is transferred to the step of next sub-channels continue to execute the searching physical frame, until
Each sub-channels in ergodic channels list.
It is described that physical frame is found on current sub-channel in some optional embodiments, it specifically includes：
By detecting the frame head of physical frame, to find physical frame.
In some optional embodiments, when frame head is not detected on current sub-channel, continue on current sub-channel
Detection is executed, until when being more than the stand-by period of subchannel, next sub-channels is transferred to and continues to execute the searching physical frame
The step of.
In some optional embodiments, when parsing the SICH and CCH unsuccessful, continuation executes on current sub-channel
The step of searching physical frame, is transferred to next sub-channels and continues to execute institute until when being more than the stand-by period of subchannel
State the step of finding physical frame.
It is described to obtain systematic parameter from physical frame in some optional embodiments, including：
Using the analysis result, broadcast message frame BCF is detected from the physical frame；
Systematic parameter is obtained from the BCF.
In some optional embodiments, when BCF is not detected from the physical frame, continuation is held on current sub-channel
It the step of row searching physical frame, until when being more than the stand-by period of subchannel, is transferred to next sub-channels and continues to execute
The step of searching physical frame.
In some optional embodiments, the above method further includes：
When beginning look for physical frame in the subchannel selected, start SICH timers and BCF timers；
Judge whether successfully parse SICH before the SICH timer expiries, if so, resetting SICH timers, otherwise
It using the subchannel selected as starting point, is re-executed according to the channel list and obtains synchronous flow, until in a son letter
After obtaining systematic parameter on road, the subchannel which alternatively goes out directly is re-executed to the flow for keeping synchronous；
Judge whether detect BCF before the BCF timer expiries, if so, resetting BCF timers and selecting
Subchannel on continually look for physical frame, otherwise using the subchannel selected as starting point, re-executed according to the channel list
Synchronous flow is obtained, until after obtaining systematic parameter on a sub-channels, the son that directly alternatively goes out the subchannel
Channel re-executes the flow for keeping synchronous.
In some optional embodiments, the above method further includes：
When beginning look for physical frame in the subchannel selected, start SICH timers and BCF timers；
Judge whether successfully parse SICH before the SICH timer expiries, if so, resetting SICH timers, otherwise
It is re-executed according to the channel list and obtains synchronous flow；
Judge whether detect BCF before the BCF timer expiries, if so, resetting BCF timers and selecting
Subchannel on continually look for physical frame, otherwise re-executed according to the channel list and obtain synchronous flow.
In some optional embodiments, the above method further includes：
When beginning look for physical frame in the subchannel selected, start SICH timers and BCF timers；
Judge whether successfully parse SICH before the SICH timer expiries, if so, resetting SICH timers, otherwise
One is reselected from available subchannel executes the flow for keeping synchronous；
Judge whether detect BCF before the BCF timer expiries, if so, resetting BCF timers and selecting
Subchannel on continually look for physical frame, one is otherwise reselected from available subchannel and executes the flow for keeping synchronous.
In some optional embodiments, using the SICH in the present physical frame searched out, next physical frame is determined
At the beginning of.
The embodiment of the present invention also provides in a kind of wireless network and realizes synchronous device, including：
First detection unit, for finding physical frame on sub-channels；
First resolution unit, for parsing SICH and CCH in the physical frame that the first detection unit searches out, wherein
The structure of the SICH instructions physical frame, the distribution of the CCH instructions system resource；
First acquisition unit, for using first resolution unit parse as a result, being sought from the first detection unit
Systematic parameter is obtained in the physical frame found；And a sub-channels are selected from the subchannel for obtained systematic parameter；
Second detection unit, for continually looking for physical frame in the subchannel selected.
Second resolution unit, for parsing SICH and CCH in the physical frame that second detection unit is found.
Second acquisition unit, for the analysis result using the second resolution unit, from the physics of second detection unit searching
BCF is detected in frame, to obtain systematic parameter.
In some optional embodiments, the first detection unit finds physical frame on current sub-channel；
First acquisition unit triggers the first detection unit and is transferred to next sub-channels after obtaining systematic parameter
Physical frame is continually looked for, until each sub-channels in traversal predetermined channel list.
In some optional embodiments, the first detection unit is specifically used for：
By detecting the frame head of physical frame, to find physical frame.
In some optional embodiments, the first detection unit when frame head is not detected on current sub-channel, after
Continue and execute detection on current sub-channel, until when being more than the stand-by period of subchannel, is transferred to next sub-channels and continues institute
State searching physical frame.
In some optional embodiments, when the first resolution unit parses the SICH and CCH unsuccessful, the first inspection of triggering
Unit is surveyed to continue the step of executing the searching physical frame on current sub-channel, until when being more than the stand-by period of subchannel,
Triggering first detection unit is transferred to next sub-channels and continually looks for physical frame.
In some optional embodiments, first acquisition unit utilizes the analysis result, is detected from the physical frame
Broadcast message frame BCF；Systematic parameter is obtained from the BCF.
In some optional embodiments, when BCF is not detected from the physical frame in first acquisition unit, triggering first
Detection unit continues the step of executing the searching physical frame on current sub-channel, until more than the stand-by period of subchannel
When, triggering first detection unit is transferred to next sub-channels and continually looks for physical frame.
In some optional embodiments, above-mentioned apparatus further includes：SICH timers, BCF timers and judging unit；
The second detection unit starts the SICH timings when beginning look for physical frame in the subchannel selected
Device and BCF timers；
The judging unit, for judging whether second resolution unit successfully solves before the SICH timer expiries
SICH is analysed, if so, resetting the SICH timers, otherwise trigger the module for obtaining synchronization is with the subchannel selected
Starting point simultaneously re-executes operation according to the channel list；Judge whether the second acquisition unit is super in the BCF timers
When before detect BCF, if so, resetting the BCF timers and triggering the second detection unit in the subchannel selected
On continually look for physical frame, otherwise trigger described obtaining synchronous module using the subchannel selected as starting point and according to described
Channel list re-executes operation；
The first acquisition unit obtains system further during re-executing operation on a sub-channels
After parameter, directly triggers the module for keeping synchronization and operation is re-executed with the subchannel that the subchannel alternatively goes out.
In some optional embodiments, above-mentioned apparatus further includes：SICH timers, BCF timers and judging unit；
The second detection unit starts the SICH timings when beginning look for physical frame in the subchannel selected
Device and BCF timers；
The judging unit, for judging whether second resolution unit successfully solves before the SICH timer expiries
SICH is analysed, if so, resetting the SICH timers, otherwise triggers the module for obtaining synchronization according to the channel list weight
Newly execute operation；Judge whether the second acquisition unit before the BCF timer expiries detects BCF, if so, resetting
The BCF timers simultaneously trigger the second detection unit and continually look for physical frame in the subchannel selected, and otherwise trigger
The module for obtaining synchronization re-executes operation according to the channel list.
In some optional embodiments, above-mentioned apparatus further includes：SICH timers, BCF timers and judging unit；
The second detection unit starts the SICH timings when beginning look for physical frame in the subchannel selected
Device and BCF timers；
The judging unit, for judging whether second resolution unit successfully solves before the SICH timer expiries
SICH is analysed, if so, reset the SICH timers, otherwise triggers the first acquisition unit again in available subchannel
Selection one；Judge whether the second acquisition unit before the BCF timer expiries detects BCF, if so, resetting institute
It states BCF timers and triggers the second detection unit and continually look for physical frame in the subchannel selected, otherwise trigger institute
It states first acquisition unit and selects one in available subchannel again.
In some optional embodiments, the second detection unit is worked as in the subchannel selected using what is searched out
SICH in preceding physical frame, at the beginning of determining next physical frame.
As it can be seen that synchronous method is realized in wireless network provided by the invention, when for accessing wireless network, for physics
The dynamically configurable situation of frame structure realizes acquisition system synchronization.
For above-mentioned and relevant purpose, one or more embodiments include being particularly described below and in claim
In the feature that particularly points out.Certain illustrative aspects are described in detail in the following description and the annexed drawings, and its instruction is only
Some modes in the utilizable various modes of principle of each embodiment.Other benefits and novel features will be under
The detailed description in face is considered in conjunction with the accompanying and becomes apparent, the disclosed embodiments be all such aspects to be included and they
Be equal.
Figure of description
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the method flow diagram that wireless network is accessed in the present invention；
Fig. 2 is the method for accessing wireless network in the present invention；
Fig. 3 is the reference model of enhanced ultrahigh speed WLAN (EUHT) system；
Fig. 4 is the access system composition of EUHT systems；
Fig. 5 is the process of protocol data between STA and CAP in EUHT systems sent and received；
Fig. 6 is the method flow diagram for accessing wireless network in the embodiment of the present invention；
Fig. 7 is the flow chart that STA keeps down-going synchronous；
Fig. 8 is the structural schematic diagram for the terminal side equipment that wireless network is accessed in the present invention；
Fig. 9 is a kind of structural schematic diagram for the device that system synchronization is obtained in the embodiment of the present invention；
Figure 10 is another structural schematic diagram for the device that system synchronization is obtained in the embodiment of the present invention.
Specific implementation mode
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Put into practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual component and function are optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, these embodiments of the invention can individually or generally be indicated that this is only with term " invention "
For convenience, it and if in fact disclosing the invention more than one, is not meant to automatically limit ranging from appointing for the application
What single invention or inventive concept.
Fig. 1 is the method flow diagram that wireless network is accessed in the present invention, which includes：
Step 11：Obtain system synchronization.
Here acquisition systematic parameter is equivalent to the process for carrying out system initialization.
Step 12：Random access carries out capability negotiation to CAP, and with the CAP.
Method in the present invention for accessing wireless network, refers to the process of the acquisition system synchronization in flow shown in Fig. 1.
Fig. 2 is the method for accessing wireless network in the present invention, and this method includes obtaining synchronous flow, the acquisition
Synchronous flow includes：
Step 21：Physical frame is found on current sub-channel.
Step 22：The system information channel (SICH) and control channel (CCH) in the physical frame searched out are parsed, it is described
SICH indicates the structure of the physical frame, the distribution of the CCH instructions system resource.
Method in the present invention for accessing wireless network proposes, object for the dynamically configurable situation of Physical Frame Structure
Manage the structure configuration of the SICH instruction physical frames in frame, such as the presence or absence of each channel and duration in instruction physical frame.
The distribution of CCH instruction system resources in physical frame, including the instruction for the resource distributed for systematic parameter.
Step 23：Using analysis result, systematic parameter is obtained from physical frame.
As it can be seen that provided by the present invention for accessing in the method for wireless network, it is dynamically configurable for Physical Frame Structure
Situation realizes acquisition system synchronization.
Before the alternative embodiment of the method for the present invention is discussed in detail, the application scenarios of alternative embodiment are provided first, it should
Application scenarios are only a kind of specific citing, can not limit protection scope of the present invention.
Fig. 3 is the reference model of EUHT systems.
System reference model shown in Fig. 3 is primarily referred to as air interface reference model, including：Media access control (MAC)
Layer and physics (PHY) layer, the major function of each layer are summarized as follows：
1. MAC layer includes adaptation sublayer and media access control sublayer.
It is adapted to sublayer：Mapping between external network data and MAC layer service agreement unit (MSDU) is mainly provided and is turned
The function of changing.MSDU refers to the information delivered as unit between MAC service accessing points (SAP).
Media access control sublayer：Further include management to system and control and to PHY other than taking on media access control function
The support of the specific function of layer.
2. PHY layer：It is main that the PHY transmission mechanisms that MPDU is mapped to corresponding physical channel, such as orthogonal frequency are provided
(OFDM) and multiple-input, multiple-output (MIMO) technology of multiplexing.MPDU utilizes PHY layer service to be exchanged between referring to two peer MAC entities
Data cell.
Fig. 4 is the access system composition of EUHT systems, including central access point (CAP) and website (STA), and wherein STA can
Think various data equipments, such as：PDA, notebook, camera, video camera, mobile phone, tablet computer and pad etc..Such as Fig. 4 institutes
Show, STA1 and STA2 access CAP by air interface protocol, CAP by it is wired or wirelessly with existing external network (such as IP
Backbone network, Ethernet) establish communication.The agreement composition of wherein CAP includes MAC layer and PHY layer.STA agreements composition includes application
(Application) layer, transmission control (TCP) layer, network (IP) layer, MAC layer and PHY layer.
Agreement composition based on shown in Fig. 4, Fig. 5 give the mistake of protocol data between STA and CAP sent and received
Journey, such as：STA wants to send data to CAP, and STA will apply data (such as VoIP, video) by application layer, TCP/IP first
Layer is handled and is packaged, and being sent to IP in the form of IP is grouped is adapted to sublayer, is converted and is mapped by IP adaptation sublayers, is sent to
Media access control sublayer, media access control sublayer issue PHY layer, are finally mapped to wireless communication by PHY by operations such as fragment, encryption, framing, polymerizations
Carry out data transmission on road.
In EUHT systems, STA and CAP can support 20MHz, 40MHz and 80MHz, system predetermined channel list instruction
The subchannel of system may include the work subchannel of one or more CAP in these subchannels.
Table 1 below gives a kind of citings of predetermined channel list under 2.4GHz frequency ranges.
Table 1
Fig. 6 is the method flow diagram for accessing wireless network in the embodiment of the present invention, and this method includes obtaining synchronization
Flow, the flow for obtaining synchronization include：
Step 61：Physical frame is found on current sub-channel, specifically, judging whether detect object on current sub-channel
The frame head of frame is managed, if so, executing step 62, detection is otherwise continued to execute, until when being more than the stand-by period of subchannel, shifts
Step 61 is continued to execute to next sub-channels.
Step 62：Judge whether to parse the SICH and CCH in physical frame, if so, executing step 63, otherwise continues
Step 61 is executed, until when being more than the stand-by period of subchannel, next sub-channels is transferred to and continues to execute step 61.
In the targeted physical frame of the present invention, the position and duration of targeting sequencing and SICH are preset, without dynamic
Configuration, CCH are located at adjacent position after SICH, and the duration of CCH can be with dynamic configuration.
SICH indicates the structure configuration of physical frame, can specifically indicate in present physical frame the presence or absence of each channel and/or when
It is long.For example, for the fixed channel of some durations, the presence or absence of the channel, implicit indication can be indicated using 1 bit in SICH
The duration of the channel；For the unfixed channel of some durations, can be indicated using more bits in SICH, by taking CCH as an example,
6 bits, maximum can be used to may indicate that 63 OFDM symbols, 1 OFDM symbol are minimum resource allocation unit in SICH, such as
This 6 bit is 010000, and it is 16 to be converted to decimal number, that is, corresponds to 16 OFDM symbols.
Positions and duration of the CCH in physical frame can be determined by parsing SICH, then wide from the CCH detections in physical frame
Dispatch is broadcast, to be detected as the resource of broadcast message frame (BCF) distribution.Following table 2 gives the one of broadcast scheduling signaling
Kind citing, BCF are transmitted in signaling/feedback channel shown in table 2, and signaling/feedback channel is included in transmission channel.
Work as b3b2b1b0It is determined as downlink signaling/feedback channel resources instruction when taking 0000, if b310 determination is taken there are BCF frames,
b36b35…b32Indicate the position of resource, b39b38b37Indicate the length of resource.
Table 2
Step 63：Judge whether to detect BCF, if it is realize down-going synchronous, otherwise return to step 61, until
More than the subchannel stand-by period when, be transferred to next sub-channels and continue to execute step 61.
BCF is broadcast configuration message, by CAP in all working subchannel periodic broadcast, wherein carrying the MAC of CAP
Address so that STA identifies the transmitting terminal of BCF.Carrying system parameter is gone back in BCF.
The systematic parameter that BCF is carried may include playing instruction in other flows to networking follow-up process or after networking
The various parameters of effect.
Following table 3 shows a kind of citings that the frame of BCF carries information.
Table 3
As shown in table 3, the information carried in BCF can be divided into following a few classes：
1) MAC Address of CAP, STA can identify the CAP for sending BCF according to the MAC Address.
2) working channel number and bandwidth of operation of CAP, in conjunction with working channel number and bandwidth of operation here, STA can be true
Determine in addition to the subchannel of currently detected BCF, broadcasts other work subchannels of the CAP of the BCF.
3) antenna configuration of CAP, STA will use the parameter after access wireless network success.
4) network alias indicates network name so that STA can select the network to be added.
5) network alias length indicates that the length of network alias field, the length fixation of network alias field can save
Expense reduces parsing deviation.
6) indicate that the timestamp of system common clock, STA can adjust the clock of oneself according to the timestamp.
7) intervals BCF of BCF broadcast cycles are indicated, after obtaining systematic parameter for the first time, STA needs to pass through not disconnecting STA
It receives SICH and BCF to keep in touch with CAP always to confirm oneself, according to the intervals BCF, STA can periodically obtain BCF.
8) conflict avoidance parameter, including：Maximized window that the minimum window and random access that random access is kept out of the way are kept out of the way and
The maximized window that the minimum window and scheduling request that scheduling request is kept out of the way are kept out of the way.The minimum that STA can evade according to random access
The maximized window that window and random access are kept out of the way is moved back when multiple STA are clashed in subsequent random access procedure
It keeps away.The maximized window that STA can also keep out of the way according to the minimum window and scheduling request that scheduling request is kept out of the way occurs in scheduling request
When conflict, kept out of the way.The method kept out of the way specifically is executed to be described in detail below.
9) transmission power of CAP, after access wireless network success, STA can carry out open loop work(according to the transmission power
Control.
10) physical frame structure parameters, including：
Be used to indicate the DGI of the conversion time of downlink and uplink, the conversion time for being used to indicate uplink and downlink UGI；
It is used to indicate the position of the downlink sounding channel of initial position of the downlink sounding channel in descending transmission channel；
It is used to indicate the downlink detecting pilot frequency pattern of downlink detecting pilot frequency pattern picture index；
And it is used to indicate the demodulation pilot tone time domain interval at demodulation pilot time domain interval.
The physical frame structure parameters carried in BCF frames indicate the part-structure in physical frame, this part-structure is in dynamic
It generally will not change when configuring Physical Frame Structure, so carrying the unified instruction in BCF, be thus not necessarily to repeat to refer in the sich
Show, saves the expense of SICH.
11) it is used to indicate uplink random access channel (UL-RACH) format of random access format.For not in the present invention
The format that same random access distance sets different uplink random access channels is passed through with supporting to cover farther distance
Indicate that uplink random accesses channel format in BCF so that STA is selected with random access apart from matched format.
According to specific application demand, CAP can carry one or several of information shown in table 3 in the BCF of generation,
Then the BCF of generation is broadcasted.
After STA obtains systematic parameter on certain sub-channels, transfers to next sub-channels and continue to execute step 61, directly
It was carried out single pass to all subchannels in channel list, completes to obtain synchronous flow.
After being carried out overscanning to every sub-channels in channel list, STA may be in one or more subchannels
On all obtain systematic parameter, the one or more subchannel may be the work subchannel of the same CAP, it is also possible to including not
With the work subchannel of CAP.STA will obtain all subchannels of systematic parameter as available subchannel, and therefrom select
Go out any one and keep the subchannel of synchronous flow as subsequent execution, while also defining the CAP to be accessed.
The method of the present invention further includes the synchronous flow of holding, including：Physics is continually looked in the subchannel selected
Frame；Parse the SICH and CCH in the physical frame searched out；BCF is detected from the physical frame searched out using analysis result, to obtain
Take systematic parameter.
Specifically, Fig. 7 is that STA keeps synchronous flow chart in the embodiment of the present invention.From figure 7 it can be seen that keeping same
In the flow of step, SICH timers and BCF timers are set, and STA continually looks for physical frame in the subchannel selected, and opens
Dynamic SICH timers and BCF timers.If successfully parsing SICH before SICH timer expiries, SICH timers are reset,
If successfully being detected BCF before BCF timer expiries, resets BCF timers and continue to seek in the subchannel selected
Look for physical frame.When any one time-out in the two timers but detects corresponding information not successfully, then it is assumed that STA loses
Step, needs to scan channel again.Here the channel of scanning again specifically includes the following two kinds realization method：
The first, it using the subchannel selected as starting point, is re-executed according to channel list and obtains synchronous flow, until
After obtaining systematic parameter on one sub-channels, the subchannel for directly alternatively going out the subchannel executes holding synchronization again
Flow continues to scan on channel list if scanning arrives the last one subchannel of channel list still without available subchannel
The first sub-channels；
The second, it is re-executed according to channel list and obtains synchronous flow, be equivalent to each channel in channel list all
It is scanned, then an available subchannel is selected to execute the flow for keeping synchronous again.
Both the above realization method can be applied in the following two kinds scene：
1) after obtaining synchronous flow, an available subchannel is only determined；
2) after obtaining synchronous flow, if it exceeds setting time, does not just consider further that the acquisition synchronizes in flow
The available subchannel determined, it is expired that such case is also referred to as channel list.
Certainly, both the above realization method is not necessarily to apply in both scenes, any of which realization method
It all can serve as set operation mode.
As optional another realization method, STA can be by another available subchannel alternatively after step-out
The subchannel gone out executes the flow for keeping synchronous again.This realization method can be applied in following application scenarios：It obtains same
Available subchannel more than one is determined after the flow of step, and present channel list is not out of date.Certainly, if in system
There is no the limitation that channel list is expired, this realization method can also be used as set operation mode, be obtained when in execution for the first time
When taking the available subchannel more than one determined when synchronous flow, so that it may to use the operation mode.
The timing length of SICH timers and BCF timers can be flexibly arranged according to application demand.
As can be seen that it is that STA constantly looks for physical frame in the subchannel selected, and constantly parses SICH to keep synchronizing
And the process of detection BCF.Since SICH indicates the structure of affiliated physical frame, STA can be utilized during keeping synchronous
The analysis result of current SICH, at the beginning of knowing next physical frame.
Fig. 8 is the structural schematic diagram of the terminal side equipment of access wireless network in the present invention, which includes：Acquisition system
Synchronous device 81, random access terminal side device 82 and capability negotiation end side device 83.
The device 81 for obtaining system synchronization, for executing the process for obtaining system synchronization with CAP.
Random access terminal side device 82, for random access to above-mentioned CAP.
Capability negotiation end side device 83, for carrying out capability negotiation with above-mentioned CAP.
Device in the present invention for accessing wireless network, refers to the device 81 of above-mentioned acquisition system synchronization.
The device of acquisition system synchronization includes in the present invention：Synchronous module is obtained, the module for obtaining synchronization includes：
First detection unit, the first resolution unit and first acquisition unit.
The first detection unit, for finding physical frame on current sub-channel.
First resolution unit, for parsing SICH and CCH in the physical frame that the first detection unit searches out,
The structure of the wherein described SICH instructions physical frame, the distribution of the CCH instructions system resource.
The first acquisition unit is used for using first resolution unit parsing as a result, single from first detection
Systematic parameter is obtained in the physical frame that member searches out.
Fig. 9 is a kind of structural schematic diagram for the device that system synchronization is obtained in the embodiment of the present invention, which includes：It obtains
Synchronous module 91, obtaining synchronous module 91 includes：First detection unit 911, the first resolution unit 912 and first obtain single
Member 913.
First detection unit 911, for finding physical frame on current sub-channel.
First resolution unit 912, for parsing SICH and CCH in the physical frame that first detection unit 911 searches out,
Described in SICH instruction physical frames structure, the distribution of CCH instruction system resource.
First acquisition unit 913, for using the first resolution unit 912 parse as a result, being sought from first detection unit 911
Systematic parameter is obtained in the physical frame found.
Further, first acquisition unit 913 can trigger first detection unit 911 and shift after obtaining systematic parameter
Physical frame is continually looked for next sub-channels, until each sub-channels in traversal predetermined channel list.
Further, first acquisition unit 913 can will obtain all subchannels of systematic parameter as available son
Channel, and therefrom select any one subchannel.
The frame for passing through the detection physical frame on current sub-channel as a kind of optional embodiment, first detection unit 911
Head, to find physical frame.
Further, first detection unit 911 is when being not detected frame head on current sub-channel, continue to execute detection, until
More than subchannel stand-by period when, be transferred to next sub-channels and continually look for physical frame.
As a kind of optional embodiment, when the first resolution unit 912 parses SICH and CCH unsuccessful, the first inspection of triggering
It surveys unit 911 and continues to execute operation, until when being more than the stand-by period of subchannel, triggering first detection unit 911 is transferred to down
One sub-channels continually look for physical frame.
As a kind of optional embodiment, first acquisition unit 913 detects broadcast message frame BCF from the physical frame,
Again systematic parameter is obtained from the BCF.
Further, when BCF is not detected in first acquisition unit 913, triggering first detection unit 911 continues to execute operation,
Until when being more than the stand-by period of subchannel, triggering first detection unit 911 is transferred to next sub-channels and continually looks for physics
Frame.
Based on synchronous module 91 is obtained, the device that system synchronization is obtained in the embodiment of the present invention further includes keeping synchronous
Module 92, keeps the synchronous module 92 to include：Second detection unit 921, the second resolution unit 922 and second acquisition unit 923.
Second detection unit 921, for continually looking for physical frame in the subchannel selected.
Second resolution unit 922, for parsing SICH and CCH in the physical frame that second detection unit 921 is found.
Second acquisition unit 923 is sought for the analysis result using the second resolution unit 922 from second detection unit 921
BCF is detected in the physical frame looked for, to obtain systematic parameter.
As the first optional embodiment for keeping synchronous module 92, the synchronous module 92 is kept to further include：SICH
Timer 924, BCF timers 925 and judging unit 926.
Second detection unit 921 starts SICH timers 924 and BCF timers further when beginning look for physical frame
925。
Judging unit 926, for judging whether the second resolution unit 922 successfully parses before 924 time-out of SICH timers
SICH, if so, resetting SICH timers 924, otherwise triggering obtains synchronous module 91 and is held again according to the channel list
Row operation；Judge whether second acquisition unit 923 before 925 time-out of BCF timers detects BCF, if so, resetting BCF is fixed
When device 925 and trigger second detection unit 921 and continually look for physical frame in the subchannel selected, otherwise triggering obtains same
The module 91 of step re-executes operation according to the channel list.
It is identical as structure shown in Fig. 9 as second of optional embodiment for keeping synchronous module 92, it keeps synchronizing
Module 91 further include：SICH timers 924, BCF timers 925 and judging unit 926.
Second detection unit 921 starts SICH timers 924 and BCF timers further when beginning look for physical frame
925。
Judging unit 926, for judging whether the second resolution unit 922 successfully parses before 924 time-out of SICH timers
SICH, if so, resetting SICH timers 924, otherwise triggering obtain synchronous module 91 using the subchannel selected as starting point,
And re-execute operation according to the channel list；Judge whether second acquisition unit 923 is examined before 925 time-out of BCF timers
BCF is measured, continues to seek in the subchannel selected if so, resetting BCF timers 925 and triggering second detection unit 921
Physical frame is looked for, otherwise triggering obtains synchronous module 91 using the subchannel selected as starting point and according to the channel list weight
Newly execute operation.
On this basis, first acquisition unit 913, further during re-executing operation, in a sub-channels
After upper acquisition systematic parameter, the module 92 that directly triggering keeps synchronous is re-executed with the subchannel that the subchannel alternatively goes out
Operation.
As the third optional embodiment for keeping synchronous module 92, structure as shown in Figure 10 keeps synchronization
Module 92 further includes：SICH timers 924, BCF timers 925 and judging unit 926.
Second detection unit 921 starts SICH timers 924 and BCF timers further when beginning look for physical frame
925。
Judging unit 926, for judging whether the second resolution unit 922 successfully parses before 924 time-out of SICH timers
SICH, if so, resetting SICH timers 924, otherwise trigger first acquisition unit 913 and selected in available subchannel again
One；Judge whether second acquisition unit 923 before 925 time-out of BCF timers detects BCF, if so, resetting BCF timings
Device 925 simultaneously triggers second detection unit 921 and continually looks for physical frame in the subchannel selected, and otherwise triggers first and obtains
Unit 913 selects one in available subchannel again.
In three kinds of alternative embodiments of the module 92 that above-mentioned holding synchronizes, if it is considered that the applied field that channel list is expired
Scape limits, and can also include the module for determining whether channel list is expired in the device, which, which can monitor, obtains synchronization
The operation of module 91 starts timing after it completes channel list scanning, after reaching setting time, show that channel list is expired
As a result.Alternatively, if end side itself has the module for determining whether channel list is expired, keep synchronous module 92 can be straight
Connect the whether expired result of the channel list obtained using the module.
In three kinds of alternative embodiments of the module 92 that above-mentioned holding synchronizes, second detection unit 921 can selected
Subchannel using the SICH in the present physical frame that searches out, at the beginning of determining next physical frame.
It is same to keep synchronous module, can integrate as in figure 9 above and three kinds of embodiments shown in Fig. 10 structure and
Function.
Synchronous with CAP settling times in order to realize, being obtained in the embodiment of the present invention can also wrap in the device of system synchronization
It includes：Synchronization unit, it is synchronous with CAP foundation using the system common clock in systematic parameter.
It should be understood that the particular order or level of the step of during disclosed are the examples of illustrative methods.Based on setting
Count preference, it should be appreciated that in the process the step of particular order or level can be in the feelings for the protection domain for not departing from the disclosure
It is rearranged under condition.Appended claim to a method is not illustratively sequentially to give the element of various steps, and not
It is to be limited to the particular order or level.
In above-mentioned detailed description, various features are combined together in single embodiment, to simplify the disclosure.No
This published method should be construed to reflect such intention, that is, the embodiment of theme claimed needs clear
The more features of feature stated in each claim to Chu.On the contrary, that reflected such as appended claims
Sample, the present invention are in the state fewer than whole features of disclosed single embodiment.Therefore, appended claims is special
This is expressly incorporated into detailed description, and wherein each claim is used as alone the individual preferred embodiment of the present invention.
Described above includes the citing of one or more embodiments.Certainly, in order to describe above-described embodiment and description portion
The all possible combination of part or method is impossible, but it will be appreciated by one of ordinary skill in the art that each implementation
Example can do further combinations and permutations.Therefore, embodiment described herein is intended to cover fall into the appended claims
Protection domain in all such changes, modifications and variations.In addition, with regard to the term used in specification or claims
The mode that covers of "comprising", the word is similar to term " comprising ", just as " including " solved in the claims as link word
As releasing.In addition, the use of any one of specification in claims term "or" being to indicate " non-exclusionism
Or ".
Claims (10)
1. synchronous method is realized in a kind of wireless network, during accessing wireless network, which is characterized in that including：
Physical frame is found on sub-channels, parses system information channel SICH and control channel CCH in the physical frame searched out,
Using parsing as a result, obtaining systematic parameter from physical frame；Wherein, the SICH indicates the structure of the physical frame, described
CCH indicates the distribution of system resource；
A sub-channels are selected from the subchannel for obtained systematic parameter；
Physical frame is continually looked in the subchannel selected, SICH and CCH in the physical frame searched out is parsed, utilizes parsing
As a result BCF is detected from the physical frame searched out, to obtain systematic parameter.
2. the method as described in claim 1, which is characterized in that the process for obtaining systematic parameter from physical frame specifically includes：
Find physical frame on current sub-channel, parse SICH and CCH in the physical frame searched out, using parsing as a result,
Systematic parameter is obtained from physical frame；
After obtaining systematic parameter, it is transferred to the step of next sub-channels continue to execute the searching physical frame, until traversal
Each sub-channels in channel list.
3. method as claimed in claim 2, which is characterized in that it is described that physical frame is found on current sub-channel, it specifically includes：
By detecting the frame head of physical frame, to find physical frame.
4. method as claimed in claim 3, which is characterized in that when frame head is not detected on current sub-channel, continuation is being worked as
Execute detection in preceding subchannel, until more than subchannel stand-by period when, be transferred to next sub-channels continue to execute it is described
The step of finding physical frame.
5. method as claimed in claim 2, which is characterized in that when parsing the SICH and CCH unsuccessful, continue in current son
The step of searching physical frame is executed on channel is transferred to next sub-channels until when being more than the stand-by period of subchannel
The step of continuing to execute the searching physical frame.
6. method as claimed in claim 2, which is characterized in that it is described to obtain systematic parameter from physical frame, including：
Using the analysis result, broadcast message frame BCF is detected from the physical frame；
Systematic parameter is obtained from the BCF.
7. realizing synchronous device in a kind of wireless network, which is characterized in that the device includes：Obtain synchronous module and holding
Synchronous module, the module for obtaining synchronization include：First detection unit, the first resolution unit and first acquisition unit；Institute
Stating the module for keeping synchronous includes：Second detection unit, the second resolution unit and second acquisition unit；
First detection unit, for finding physical frame on sub-channels；
First resolution unit, for parsing SICH and CCH in the physical frame that the first detection unit searches out, wherein described
SICH indicates the structure of physical frame, the distribution of the CCH instructions system resource；
First acquisition unit, for using first resolution unit parse as a result, being searched out from the first detection unit
Physical frame in obtain systematic parameter；And a sub-channels are selected from the subchannel for obtained systematic parameter；
Second detection unit, for continually looking for physical frame in the subchannel selected；
Second resolution unit, for parsing SICH and CCH in the physical frame that second detection unit is found；
Second acquisition unit, for the analysis result using the second resolution unit, from the physical frame that second detection unit is found
BCF is detected, to obtain systematic parameter.
8. device as claimed in claim 7, which is characterized in that further include：SICH timers, BCF timers and judging unit；
The second detection unit, when beginning look for physical frame in the subchannel selected, start the SICH timers and
BCF timers；
The judging unit, for judging whether second resolution unit successfully parses before the SICH timer expiries
SICH, if so, resetting the SICH timers, otherwise trigger the module for obtaining synchronization is with the subchannel selected
Point simultaneously re-executes operation according to the channel list；Judge the second acquisition unit whether in the BCF timer expiries
Before detect BCF, if so, resetting the BCF timers and triggering the second detection unit in the subchannel selected
Physical frame is continually looked for, otherwise triggers the module for obtaining synchronization using the subchannel selected as starting point and according to the letter
Road list re-executes operation；
The first acquisition unit obtains systematic parameter further during re-executing operation on a sub-channels
Afterwards, it directly triggers the module for keeping synchronization and operation is re-executed with the subchannel that the subchannel alternatively goes out.
9. device as claimed in claim 7, which is characterized in that further include：SICH timers, BCF timers and judging unit；
The second detection unit, when beginning look for physical frame in the subchannel selected, start the SICH timers and
BCF timers；
The judging unit, for judging whether second resolution unit successfully parses before the SICH timer expiries
Otherwise SICH triggers described obtaining synchronous module according to the channel list again if so, reset the SICH timers
Execute operation；Judge whether the second acquisition unit before the BCF timer expiries detects BCF, if so, resetting institute
It states BCF timers and triggers the second detection unit and continually look for physical frame in the subchannel selected, otherwise trigger institute
It states the synchronous module of acquisition and re-executes operation according to the channel list.
10. device as claimed in claim 7, which is characterized in that further include：SICH timers, BCF timers and judgement are single
Member；
The second detection unit, when beginning look for physical frame in the subchannel selected, start the SICH timers and
BCF timers；
The judging unit, for judging whether second resolution unit successfully parses before the SICH timer expiries
Otherwise SICH triggers the first acquisition unit and is selected in available subchannel again if so, resetting the SICH timers
Select one；Judge whether the second acquisition unit before the BCF timer expiries detects BCF, if so, described in resetting
BCF timers simultaneously trigger the second detection unit and continually look for physical frame in the subchannel selected, otherwise described in triggering
First acquisition unit selects one in available subchannel again.
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| CN201280012764.1A CN103583075B (en) | 2011-03-31 | 2012-03-07 | Method and device for accessing wireless network |
| CN201511031194.2A CN105451302B (en) | 2012-03-07 | 2012-03-07 | Synchronous method and device is realized in wireless network |
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