CN1391414A - Space channel selection method and device for base station system and distributed personal hand-held communication system - Google Patents
Space channel selection method and device for base station system and distributed personal hand-held communication system Download PDFInfo
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Abstract
A device for choosing space channel in the base station system of distributed hand-held communication system is composed of main controller and one or more remote units. Its method features that after the base station is turned on, the frame synchronization and channel time slices are distributed by associated devices, and after channels are scanned, the communication frequency point is obtained for the communication. Its advantages are the unified management to remote channel resources, more available frequency points, low system load, and high system stability.
Description
The present invention relates to the wireless access communication field, relate more specifically to the system of selection of base station air traffic channel in PHS (personal hand-held communication system) wireless access system.
The PHS wireless access system is made up of base station controller, base station, wireless user terminal, provides professional communication system such as speech, data between base station and wireless user terminal by air traffic channel.The aerial signal of PHS base station adopts the TDMA/TDD mode to work, the number of channel is 4, according to the STD-28 agreement, the aerial signal of PHS base station adopts time division duplex work, the number of channel is 4, comprises a control channel CCH and three Traffic Channel TCH, and wherein per 20 cycles of control channel (superframe of 100ms) occur once, therefore in a superframe, the operable time slot of control channel has 80 (shown in the aerial signal frame structure accompanying drawings 1).The PHS base station can bundle use, and basis had or not control channel can be divided into main website and slave station when binding was used.There is not control channel from the base station, with the public control channel of dominant base under it, 4 channels are all as Traffic Channel, but require and dominant base between frame synchronization, and 4 Traffic Channel time slots with to 4 slot synchronization of dominant base [the aerial signal frame structure when accompanying drawing 2 has shown that 4 base station bindings (1+15T) together].For control channel, the shared frequency in all base stations, and, have a plurality of frequencies available for Traffic Channel.Adopt each service in base station channel frequency resource of the different PHS of cellular system system of FDD duplex mode identical with other, do not have to be the different frequency set of each cell allocation.In order to improve power system capacity to greatest extent, require aerial signal frame synchronization between the base station.On this basis, realize that the control channel time slot is not overlapping, the overlapping Traffic Channel frequency of time slot is not overlapping.For improving channel utilization, the frequency of Traffic Channel will be wanted dynamic assignment in the whole operation process in base station.
The existing channel dynamic allocation method has been stipulated priority for each channel, forms a priority list, takies the channel of lower priority under good transmission conditions.Channel priority can be judged according to the record of interference that occurs in the channel and channel use in the past, need complicated algorithm, because the current channel situation of reflection that the Delay Priority table can not be real-time.Existing simultaneously algorithm is the channel resource at single base station, not with the unified management of binding base station channel resource, thereby can not effectively prevent the channel confliction of binding base station.
The objective of the invention is to propose the little base station of a kind of distributed PHS air traffic channel dynamic selection method and device, can realize the unified management of far-end channel resource under the same master control borad, effectively prevent the binding base station channel confliction; Frequency resource at each base station of PHS system is identical, and a lot of characteristics of each base station available traffic channel frequency adopt quick method for scanning to obtain available frequency, do not need to set up channel priority like this and can reflect channel conditions in real time.Adopt two kinds of sweep speeds to alleviate system burden according to channel the present situation, guaranteed the stability of system.
Purpose of the present invention can be achieved through the following technical solutions:
System of selection of a kind of distributed PHS base station system air traffic channel and device, described method adopts the following step:
A, base station electrifying startup, dominant base and other base station and dominant base and affiliated from base station frame synchronization and channel time slot distribution are realized in system controller control rf control unit base station, after the master control borad channel manager is received the far-end initiate notification of system controller, frequency point allocation is carried out in notice remote data storehouse, the beginning scan channel;
After b, remote data storehouse received notice, the control channel selection control received and obtains optional frequency resource table from database, interference threshold, quick sweep spacing T1 and slow scanning interval T 2;
C, channel controller scan by the flow process of setting, the acquisition frequency of can communicating by letter, and notification database also reports the master control borad channel manager by database;
After d, master control borad channel manager are received the scan channel result, handle according to this far-end attribute, can use if not independent dominant base and channel, whether whether just judge reports frequency to conflict with other far-end respective channels, if conflict just notifies the remote data storehouse to change frequency, repeat aforementioned c, d step, up to finding available frequency.
System of selection of distributed PHS base station system air traffic channel and device, described device comprises:
A, form by system controller, master control borad channel manager, being used to control far-end starts, finish air traffic channel frame synchronization, realize the time slot allocation of air traffic channel and control distal portions beginning real time scan, distribute the air traffic channel frequency, to the main control part of principal and subordinate's BTS channel frequency resource unified management of bundling;
B, form by database, channel selector, channel disturbance detector and radio-frequency module, be respectively applied for the memory channel frequency, obtain channel resource and resource behaviour in service from database, to receive and dispatch inversion, survey the interference value on the respective channel transmitting-receiving time slot, and, be responsible for signal transmitting and receiving with reporting channel selection control as a result, under system controller control, carry out the distal portions of aerial signal frame synchronization.
The present invention proposes channel selector and forms (far-end only draws among Fig. 3) by main control part and a plurality of distal portions, does not contact directly between each far-end.The dynamics of channels allocation algorithm step of the two-stage distributed base station of being made up of far-end channel real time scan and master control borad channel management is formed: (1) main control part control far-end starts, and finishes air traffic channel frame synchronization, realizes the time slot allocation of air traffic channel.(2) main control part control distal portions begins real time scan, distributes the air traffic channel frequency, and the principal and subordinate BTS channel frequency resource unified management of main control part to bundling avoided a conflict in this process.
The present invention compared with prior art has following advantage:
1. adopt distributed channel scanning administrative mechanism, channel is managed, each far-end is carried out unified management, guarantee that the channel frequency does not conflict under the binding operating position by main control part.
2. adopt two kinds of sweep speeds when far-end carries out scan channel, reduced system burden, improve reliability of system operation;
3. many at PHS Traffic Channel frequency, obtain the characteristics of available frequency easily, adopt fast scanning to obtain the channel real time status, obtain available frequency;
4. far-end channel selection control obtains far-end channel behaviour in service by database in apparatus of the present invention, prevents to be assigned with at channel, when radio frequency is opened, detects when disturbing and thinks that frequency is unavailable by mistake.
Fig. 1 is an aerial signal frame structure schematic diagram;
Fig. 2 is an IC+15T aerial signal frame result schematic diagram;
Fig. 3 is the whole block diagrams of apparatus of the present invention;
Fig. 4 is the channel of channel controller shown in a Fig. 3 selection algorithm flow chart;
Fig. 5 is a distributed little base station air traffic channel choice device principle schematic.
Below in conjunction with accompanying drawing the present invention is described in further detail: adopt the little base station of PHS of distributed frame, form by main control part and distal portions.Main control part is the base station master control borad that is placed on network side, distal portions comprises baseband board and rf board, connects with the U mouth between the baseband board of master control borad and far-end, and a master control borad can be with a plurality of far-ends, can form a plurality of independently dominant bases (each), also can adopt binding to use.Under the binding situation, slave station and main website Traffic Channel time slot are overlapping, must adopt different frequency to be distinguished, and this is by the easier solution of channel frequency unified management to binding base station.
The present invention proposes channel selector and forms (far-end only draws among Fig. 3) by main control part and a plurality of distal portions, does not contact directly between each far-end.Main control part comprises system controller, master control borad channel manager.Each distal portions comprises database, channel selection control, channel disturbance detector, radio-frequency module.Database storage channel frequency, available channel interference threshold, channel can be selected frequency meter in the distal portions, and two kinds of scan channel speed interval T1, T2 report master control borad letter plate channel manager with the scan channel result.Adopting two kinds of sweep speeds is in order to reduce system burden: current channel frequency resource is mended available, and adopting fast, scanning T1 seeks available frequency resources; Current channel frequency resource can be used, and adopts slow scanning speed T2 to scan.The channel disturbance detector will be received and dispatched inversion, and survey respective channel and send out interference value (RSSI) on the time slot, and with reporting channel selection control as a result.Channel controller obtains channel resource, resource behaviour in service (the opening and closing situation of Frequency Distribution and radio frequency) from database.Interference (RSSI) size and the channel behaviour in service that report according to interference search gear judge whether frequency is available, and with reported data storehouse as a result.Master control channel manager indicating remote database begins scan channel, and each is judged reported result according to far-end behaviour in service (independent dominant base, binding base station): if under the binding situation, other far-end Traffic Channel frequency overlapping with time slot conflicts, and changes frequency with regard to the indicating remote channel controller.System controller control far-end is realized frame synchronization between base station and other base station and binding base station slave station and main website.Radio-frequency module is responsible for the reception and the transmission of received signal, carries out aerial signal frame synchronization under system controller control.
Channel dynamic allocation method of the present invention comprises the steps: 1. base station electrifying startups, and dominant base and other base station and dominant base and affiliated from base station frame synchronization and channel time slot distribution are realized in system controller control rf control unit base station.After the master control borad channel manager was received the far-end initiate notification of system controller, frequency point allocation was carried out in notice remote data storehouse, the beginning scan channel.2. after the remote data storehouse received notice, the control channel selection control received from database and obtains optional frequency resource table, interference threshold, quick sweep spacing T1 and slow scanning interval T 2.3. channel controller scans according to Fig. 4 flow process, obtains the available communication frequency, and notification database also reports the master control borad channel manager by database.4. after the master control borad channel manager is received the scan channel result, handle according to this far-end attribute (whether main website, slave station, independent dominant base).Can use if not independent dominant base and channel, just judge to report frequency whether whether to conflict with other far-end respective channels (aerial signal structure such as Fig. 2), if conflict just notifies the remote data storehouse to change frequency, repeating step 3,4 is up to finding available frequency.
It is as follows that far-end carries out channel scan procedure according to flow chart 4: 1. the far-end channel database receives after the master control borad channel manager begins the scan channel notice, the beginning scan channel.The far-end channel controller from database frequency resource table to be selected at random be each traffic channel assignments frequency, control interference search gear by radio-frequency module each channel frequency is set.3 channel controllers obtain channel disturbance (RSSI) value with sweep spacing T2 from interference search gear.4. channel controller judges according to channel behaviour in service in the database whether the channel radio frequency is opened.5. if radio frequency is opened then is illustrated that channel uses, continue to detect down with the T2 sweep spacing, do not process.6., then judge and whether disturb greater than thresholding according to the RSSI value if radio frequency is not opened.7. disturb greater than thresholding reported data storehouse then, repeat 1 to 7 up to obtaining the available channel frequency with less sweep spacing T1.If disturb and be not more than thresholding, and be effectively then reported data storehouse of scanning for the first time, (otherwise not reporting).Then, repeat above step monitoring channel situation with the T2 sweep spacing.
Be that example is introduced with distributed little base station air traffic channel choice device below, distributed little base station system (as Fig. 5) is composed as follows: a master control borad and 4 distal portions are formed, and master control borad is connected by the U mouth with 4 far-ends (CS1, CS2, CS3, CS4).The air traffic channel of master control borad and distal portions inside is selected device and is formed as shown in Figure 3.Below base station system air traffic channel under the 1C+15T binding mode is selected to be introduced.Base station air traffic channel selection course is as follows: (1) system electrifying startup, main control part system controller control CS1 radio-frequency module is synchronous to other distal frame, then, the radio-frequency module of the control of main control part system controller CS2, CS3, CS4 is realized the time slot allocation of air traffic channel to CS1 frame synchronization, after finishing synchronously, the aerial signal frame structure as shown in Figure 2.(2) after the master control borad channel manager is received the far-end initiate notification of system controller, notify each remote data storehouse to carry out frequency point allocation, the beginning scan channel.(3) each far-end channel controller scans according to Fig. 4 flow process, obtains the available communication frequency, and notification database also reports the master control borad channel manager by database.(4) after the master control borad channel manager is received the scan channel result, occupation mode according to far-end 1C+15T, to the channel unified management: if CS1 reporting channel frequency can be used, just judge whether to conflict with other three far-end respective channels frequencies, if conflict just changes frequency, repeating step (3), (4) are up to finding available frequency.
Claims (4)
1, a kind of distributed PHS base station system air traffic channel system of selection is characterized in that described method adopts the following step:
A, base station electrifying startup, dominant base and other base station and dominant base and affiliated from base station frame synchronization and channel time slot distribution are realized in system controller control rf control unit base station, after the master control borad channel manager is received the far-end initiate notification of system controller, frequency point allocation is carried out in notice remote data storehouse, the beginning scan channel;
After b, remote data storehouse received notice, the control channel selection control received from database and obtains optional frequency resource table, interference threshold, quick sweep spacing T1 and slow scanning interval T 2;
C, channel controller scan by the flow process of setting, the acquisition frequency of can communicating by letter, and notification database also reports the master control borad channel manager by database;
After d, master control borad channel manager are received the scan channel result, handle according to this far-end attribute, can use if not independent dominant base and channel, whether whether just judge reports frequency to conflict with other far-end respective channels, if conflict just notifies the remote data storehouse to change frequency, repeat aforementioned c, d step, up to finding available frequency.
2, distributed PHS base station system air traffic channel according to claim 1 system of selection is characterized in that: the remote data storehouse is carried out the step of scan channel and is in a step of described method:
E, far-end channel database receive after the master control borad channel manager begins scan channel notice, the beginning scan channel;
F, far-end channel controller are each traffic channel assignments frequency from database frequency resource table to be selected at random, and the control interference search gear is provided with each channel frequency by radio-frequency module;
G, channel controller obtain channel disturbance RSSI value with sweep spacing T2 from interference search gear;
H, channel controller judge according to channel behaviour in service in the database whether the channel radio frequency is opened;
Confirm that channel uses if the i radio frequency is opened, continue to detect down with the T2 sweep spacing;
If the j radio frequency is not opened, then judge and whether disturb greater than thresholding according to the RSSI value;
K, disturb greater than thresholding reported data storehouse then, repeat aforementioned e to the k step with less sweep spacing T1,, be not more than thresholding if disturb up to obtaining the available channel frequency, and be effectively then reported data storehouse of scanning for the first time, repeat above step monitoring channel situation with the T2 sweep spacing then.
3, a kind of distributed PHS base station system air traffic channel choice device, described device comprises main control part (1) and distal portions (2), wherein: main control part has: system controller (11) and master control borad channel manager (12); Distal portions has: database (21), channel selector (22), channel disturbance detector (23) and radio-frequency module (24): described master control borad channel manager (12) is used to control far-end and starts, written instructions remote data storehouse begins scan channel according to far-end behaviour in service (independent dominant base, binding base station) reported result is judged, distribute the air traffic channel frequency, to the principal and subordinate's BTS channel frequency resource unified management that bundles: described system controller (11) control far-end is realized between the base station and frame synchronization between main website, finish air traffic channel frame synchronization, realize the time slot allocation of air traffic channel and control distal portions (2) beginning real time scan; Described database (21) is used for the memory channel frequency, and available channel interference threshold, channel can be selected frequency meter, and two kinds of scan channel speed interval T1, T2 report master control borad letter plate channel manager with the scan channel result; Described channel selector control (22) obtains channel resource, resource behaviour in service from database (21) (the opening and closing situation of Frequency Distribution and radio frequency judges whether frequency is available, and with reported data storehouse as a result; Described channel disturbance detector (23) will be received and dispatched example and put, the interference value (RSSI) when surveying respective channel and sending out time slot, and with reporting channel selection control (22) as a result; Described radio-frequency module (24) is responsible for the reception and the transmission of received signal, carries out aerial signal frame synchronization under system controller control.
4, distributed PHS base station system air traffic channel choice device as claimed in claim 3 is characterized in that: described distal portions (2) can have identical a plurality of, not directly contact mutually between a plurality of far-ends.
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| CN 01113428 CN1264364C (en) | 2001-06-11 | 2001-06-11 | Space channel selection method and device for base station system and distributed personal hand-held communication system |
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| CN 01113428 CN1264364C (en) | 2001-06-11 | 2001-06-11 | Space channel selection method and device for base station system and distributed personal hand-held communication system |
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Cited By (14)
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| WO2007003137A1 (en) * | 2005-07-05 | 2007-01-11 | Huawei Technologies Co., Ltd. | A method for finding adjacent station and establishing connection with adjacent station by coexistence bs when initializing |
| WO2007006220A1 (en) * | 2005-07-08 | 2007-01-18 | Huawei Technologies Co., Ltd. | A method for finding adjacent station and establishing connection with adjacent station by coexistence bs when initializing |
| CN1306843C (en) * | 2003-12-26 | 2007-03-21 | 中兴通讯股份有限公司 | Intelligent maintenance method for base station bundling relaton of local radio telephone system |
| CN1312959C (en) * | 2004-08-19 | 2007-04-25 | Ut斯达康通讯有限公司 | Method for control channels distribution in PHS base station |
| WO2007079644A1 (en) * | 2006-01-09 | 2007-07-19 | Huawei Technologies Co., Ltd. | Method and coexistence bs for allocating coexistence time slot of the coexistence bs |
| CN100397939C (en) * | 2004-04-14 | 2008-06-25 | 微星科技股份有限公司 | Radio base station and its channel searching method |
| CN100473211C (en) * | 2005-04-08 | 2009-03-25 | 中兴通讯股份有限公司 | Logical control channel processing device and method in wireless local telephone system base station |
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| CN1889759B (en) * | 2005-06-27 | 2010-05-05 | 上海原动力通信科技有限公司 | Method for supporting multi-frequency point data receiving in high-speed down group |
| CN1965603B (en) * | 2004-06-07 | 2010-06-16 | Lg电子株式会社 | Method for scanning neighboring base stations in wireless access system |
| CN101090292B (en) * | 2006-06-12 | 2010-12-08 | 展讯通信（上海）有限公司 | Time synchronous method of digital centerless communication system |
| CN101471725B (en) * | 2007-12-29 | 2012-11-21 | 鼎桥通信技术有限公司 | Method for frame synchronization of distributed base station |
| US8494524B2 (en) | 2005-09-02 | 2013-07-23 | Huawei Technologies Co., Ltd. | Method for collecting interference status information of subscriber station by coexistence base station |
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| CN1306843C (en) * | 2003-12-26 | 2007-03-21 | 中兴通讯股份有限公司 | Intelligent maintenance method for base station bundling relaton of local radio telephone system |
| CN100397939C (en) * | 2004-04-14 | 2008-06-25 | 微星科技股份有限公司 | Radio base station and its channel searching method |
| US8014774B2 (en) | 2004-06-07 | 2011-09-06 | Lg Electronics Inc. | Scanning neighboring base stations in wireless access system |
| US8781465B2 (en) | 2004-06-07 | 2014-07-15 | Lg Electronics Inc. | Scanning neighboring base stations in wireless access system |
| US8774799B2 (en) | 2004-06-07 | 2014-07-08 | Lg Electronics Inc. | Scanning neighboring base stations in wireless access system |
| US8320908B2 (en) | 2004-06-07 | 2012-11-27 | Lg Electronics Inc. | Scanning neighboring base stations in wireless access system |
| CN1965603B (en) * | 2004-06-07 | 2010-06-16 | Lg电子株式会社 | Method for scanning neighboring base stations in wireless access system |
| US8175595B2 (en) | 2004-06-07 | 2012-05-08 | Lg Electronics Inc. | Scanning neighboring base stations in wireless access system |
| CN1312959C (en) * | 2004-08-19 | 2007-04-25 | Ut斯达康通讯有限公司 | Method for control channels distribution in PHS base station |
| CN100473211C (en) * | 2005-04-08 | 2009-03-25 | 中兴通讯股份有限公司 | Logical control channel processing device and method in wireless local telephone system base station |
| CN1856160B (en) * | 2005-04-27 | 2010-04-21 | 中兴通讯股份有限公司 | Method for reducing re-inquiry rate of mobile linking in personal mobile telephone system |
| CN1889759B (en) * | 2005-06-27 | 2010-05-05 | 上海原动力通信科技有限公司 | Method for supporting multi-frequency point data receiving in high-speed down group |
| WO2007003137A1 (en) * | 2005-07-05 | 2007-01-11 | Huawei Technologies Co., Ltd. | A method for finding adjacent station and establishing connection with adjacent station by coexistence bs when initializing |
| WO2007006220A1 (en) * | 2005-07-08 | 2007-01-18 | Huawei Technologies Co., Ltd. | A method for finding adjacent station and establishing connection with adjacent station by coexistence bs when initializing |
| US8494524B2 (en) | 2005-09-02 | 2013-07-23 | Huawei Technologies Co., Ltd. | Method for collecting interference status information of subscriber station by coexistence base station |
| WO2007079644A1 (en) * | 2006-01-09 | 2007-07-19 | Huawei Technologies Co., Ltd. | Method and coexistence bs for allocating coexistence time slot of the coexistence bs |
| CN101090292B (en) * | 2006-06-12 | 2010-12-08 | 展讯通信（上海）有限公司 | Time synchronous method of digital centerless communication system |
| CN101471725B (en) * | 2007-12-29 | 2012-11-21 | 鼎桥通信技术有限公司 | Method for frame synchronization of distributed base station |
| CN113518408A (en) * | 2021-04-19 | 2021-10-19 | Tcl通讯（宁波）有限公司 | WiFi single-channel scanning method and device, terminal equipment and storage medium |
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