CN100512185C - Method of selectively adjusting the configuration of an access point antenna to enhance mobile station coverage - Google Patents
Method of selectively adjusting the configuration of an access point antenna to enhance mobile station coverage Download PDFInfo
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- CN100512185C CN100512185C CNB2005800152840A CN200580015284A CN100512185C CN 100512185 C CN100512185 C CN 100512185C CN B2005800152840 A CNB2005800152840 A CN B2005800152840A CN 200580015284 A CN200580015284 A CN 200580015284A CN 100512185 C CN100512185 C CN 100512185C
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Abstract
A wireless communication system includes a plurality of wireless transmit/receive units (WTRUs) and an access point (AP). The AP communicates with the WTRUs via an antenna. In one embodiment, the AP configures the antenna to a wide beam configuration that covers a desired service area and transmits a Request-To-Send (RTS) control message. When the AP receives a Clear-To-Send (CTS) control message from one of the WTRUs, the AP determines optimal antenna settings for communication with the one WTRU. The AP configures the antenna to a narrow beam configuration and transmits at least one data packet to the one WTRU. When the AP receives an acknowledgement message indicating that the data packet was successfully received by the WTRU, the AP configures the antenna to the wide beam configuration. In another embodiment, the AP is configured to transmit and receive data packet fragments from the WTRUs and configure the antenna accordingly.
Description
Technical field
The invention relates to field of wireless communication, the present invention is especially about the control of antenna emission mode in a wireless telecommunication system.
Background technology
In a WLAN (WLAN) system, (DistributedCoordination Function DCF) is a kind of basic access method to the distributed collaboration function, in order to be supported in the simultaneous asynchronous data transmissions on the optimum efficiency basis.The DCF pattern of wlan system is in order to support the contention service of promotion to the fair access channels of all platforms, in order to the multiple access mechanism of reaching this service avoid for the carrier sense multiple access collides agreement (Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA).The mode whether the platform sensing channel has much to do is to detect packages by all that analyze by other WLAN user sent, and via the activity of relative signal strength detecting in channel from other source.
Please refer to Fig. 1, a kind of wireless telecommunication system 100, it comprises an access point (AP) 105, and it is and a plurality of wireless transmission/receive units (WTRUs) 110,115 and 120 communications, that is platform, terminal.In AP 105 coverage area but two WTRUs outside mutual coverage area, be called hidden mutually, if two WTRUs mutual " hidden ", a WTRU can't detect the signal that is sent by the 2nd WTRU, therefore can make two WTRUs ability inefficacy of " collision is avoided " mutually.
This WLAN communications protocol is used " request transmission/clear to send (RTS/CTS) ", and handshake mechanism is with the antagonism collision effect, and by identical client, RTS/CTS can be in order to avoid hidden terminal problems.
Please refer to Fig. 2, when using RTS/CTS, the source WTRU of the defeated frame of a tendency to develop sends a RTS message 205 after a distributed interframe space (DIFS) 210 expires, indicate this WTRU must transmit the duration of its package.If target WTRU successfully receives this RTS message 205, then this target WTRU can be allowed to transmission to confirm this source WTRU, and preengage this data transmission channel with a CTS message 220 responses after a short interframe space (SIFS) 215 expires.This source WTRU then sends a data packet 225, and this target WTRU then sends affirmation message (ACK) 230 to confirm successfully to receive this data packet 225.Use this handshake mechanism, all WTRU might receive at least two messages (RTS or CTS), because this AP 105 will transmit one of this two message, reception according to RTS and/or CTS message, other WTRUs can set the network allocation vector (NAV) 235,240 during its transfer of data, then just sets up a contention window (CW) 245 before inserting this channel.In fact this mechanism guarantee that for source WTRU medium are reserved one period required duration, therefore solved hidden terminal problems.
Please refer to Fig. 3, the DCF mode operating is also supported the cracked of large media access control (MAC) communications protocol data cell (MPDUs) and reorganization.When the size of MPDU surpasses a configured threshold, it can be divided into less paragraph, and receiver is confirmed each fragment discriminably.Have only first fragment to use RTS/CTS mechanism to send, in addition, the duration scope of Initial R TS/CTS message only is responsible for first fragment, and the duration information of the fragment that continues is to be judged by the gauge outfit and affirmation (ACK) message of preorder fragment by other WTRU.
Along with the higher scope of LAN system is reached the more increase in demand of high power capacity, make the use of adaptive antennas attract the sight of this type systematic, because about the relation of the cost of adaptive antenna techniques, the use of adaptive antennas is salty to be recognized more attraction concerning AP compares all WTRU.
Typically, antenna system uses an aerial array, and forms the sensing electric wave with transmission and reception wireless signal.When the directive property that increases helps to increase containing property and signal noise ratio, and when reducing the interference to contiguous base station system (BSSs) simultaneously, it has also weakened the WTRU ability of carrying out carrier wave induction at an electric wave that gives, and it is when this AP 105 transmits packages to the WTRUs at other electric wave.In this type systematic, the RTS (at the example of AP 105 for the source) or the CTS (when AP 105 is target) that are sent by AP 105 in detecting owing to the WTRU that is arranged in electric wave have very low probability, therefore except the WTRU that AP 105 is transmitted, use this RTS/CTS handshake mechanism and can't relax hidden terminal problems.
For instance, Figure 1 shows that WTRU 110 and 115 is positioned at the state of electric wave 1, its transmission package receives package to AP105 or by AP 105.Suppose that WTRU 120 is positioned at containing outside the restriction of WTRU 110, and in different electric waves (also being electric wave 5) but not in WTRU 110 and the 115 residing electric waves (also being electric wave 1), then can't detect the package that is sent in electric wave 1 WTRU 110 and 115 by this AP105 probably, this promptly is considered as hidden electric wave problem, if and WTRU 120 has data to transmit, will cause data collision.Similarly, the fact of WTRU120 outside WTRU 110 is contained restriction also is regarded as hidden terminal problems, and it also can cause possibility of collision.Therefore, use RTS and CTS handshake mechanism and can't alleviate hidden terminal or hidden electric wave problem, because WTRU 120 can't detect by WTRU 110 and see through RTS or the CTS message that electric wave 1 is sent to this AP 105, also can't detect AP 105 and see through RTS or the CTS message that electric wave 1 is sent to WTRU 110 or 115.
Therefore just highly crave for and a kind ofly successfully transmit and receive data package and can not run into the method for hidden terminal or hidden electric wave problem.
Summary of the invention
The present invention is a kind of method that is used to comprise the wireless telecommunication system of a plurality of WTRUs and an AP.
In one embodiment, this AP is configured to via at least one data packet of at least one antenna transmission to one or more WTRUs.This AP disposes this antenna becomes a wide electric wave configuration, and it contains required coverage.This AP transmits a RTS message at least one this WTRUs via this wide electric wave antenna configurations, and this AP waits for to receive the CTS message from least one WTRU via this wide electric wave antenna configurations.This AP determine optimized antenna settings in case with a WTRU communication, this AP then disposes this antenna to be become a narrow electric wave configuration and transmits this at least one data packet to this at least one WTRU, this AP waits for to receive one and confirms that message indicates this data packet successfully to be received by this at least one WTRU, and this AP then disposes this antenna to be become the broadband and be configured to this affirmation message of corresponding reception.
This system can be wlan system, it provides the service of using CSMA/CA, if this AP fails to receive this CTS control message, then this system can carry out the transmission failure program, and this AP can carry out a MAC layer communications protocol to obtain channel access before this RTS control message of transmission.
In another embodiment, this AP is configured to transmit the data packet fragment.This AP disposes this antenna becomes a wide electric wave configuration, and it contains required coverage.This AP transmits a RTS message at least one this WTRUs via this wide electric wave antenna configurations, and this AP waits for to receive the CTS message from least one WTRU via this wide electric wave antenna configurations.This AP via this wide electric wave antenna configurations transmit a data packet fragment first partly to this at least one WTRU, this AP then disposes this antenna to be become a narrow electric wave and disposes, and transmits the second portion of this this data packet fragment via this narrow electric wave antenna configurations.
After this AP transmits the second portion of this data packet fragment, configurable this antenna of this AP becomes a wide electric wave configuration, this AP waits for to receive an affirmation message and indicates this data packet fragment to be received by this at least one WTRU, if this AP receives this affirmation message and also have more data package fragment to wait processing, then repeat this program.
If this AP does not receive this affirmation message, this system can carry out a transmission failure program.First of this data packet fragment partly can comprise a preorder, a PLCP gauge outfit and a MAC gauge outfit.
In another embodiment, this AP is configured to receive the data packet fragment.This AP receives the RTS control message by at least one WTRU sent, this AP disposes this antenna becomes a wide electric wave configuration, this AP transmits a CTS message to this at least one WTRU via this wide electric wave configuration, this AP disposes this antenna becomes a narrow electric wave configuration, this AP waits for to receive a data packet fragment via this narrow electric wave antenna configurations, if this data packet fragment successfully is received, then this AP disposes this antenna becomes a wide electric wave configuration, this AP sends one and confirms message at least one WTRU, indicates this data packet fragment successfully to receive.
If this data packet fragment successfully is not received, then configurable this antenna of this AP becomes wide electric wave configuration, and this system can carry out the program that takes defeat.If have more data package fragment to wait processing, then repeat this program.
Description of drawings
By the description of a hereinafter preferred embodiment, the example that is given, with reference to corresponding accompanying drawing, the present invention can obtain to understand in more detail, wherein:
Figure 1 shows that and comprise wireless telecommunication system of the present invention;
Figure 2 shows that the transmission of using RTS/CTS mechanism;
Figure 3 shows that the transmission of using RTS/CTS mechanism and segmentation;
Figure 4 shows that a flow chart, its explanation is carried out the AP transmission according to the step of the inventive method in order to use the RTS/CTS mechanism that does not possess segmentation in the system of Fig. 1;
Figure 5 shows that a flow chart, its explanation is carried out the AP transmission according to the step of the inventive method in order to use the RTS/CTS mechanism that possesses segmentation in the system of Fig. 1; And
Figure 6 shows that a flow chart, its explanation receives in order to use the RTS/CTS mechanism that possesses/do not possess segmentation to carry out AP in the system of Fig. 1 according to the step of the inventive method.
Embodiment
Better embodiment illustrates with reference to the accompanying drawings, the wherein identical identical assembly of label representative.
Preferably, method and system disclosed herein uses one or more wireless transmission/receive units (WTRU), after this, a WTRU comprises but any type of device that is not limited to a subscriber equipment (UE), a travelling carriage, a fixing or moving user unit, a calling set or can operates under a wireless environment.
A kind of method of the present invention, an access point that is equipped with an adaptive antennas system wherein, when transmission RTS, CTS and ACK package, relax its emission mode, and when transmission and/or reception data packet, use more directing mode, in the example that uses segmentation, only PPDU comprises the initial part of the information of duration, can use the emission mode transmission of relaxing.
Suppose that AP 105 is equipped with the adaptive antennas system, its can concentrate its emission mode with transmission and/or receive to/from specific region one of in integrity service zone (also being cell).In addition, AP 105 configurable its adaptive antennas systems become a wide emission mode with transmission and/or reception, and it contains the whole zone of this cell service.Relaxing of emission mode can be reached by diverse ways, includes, but are not limited to use the comprehensive antenna of a difference, or adjusting electric wave forms valve to allow of the same race the containing in all directions.When the transmission that receives from the WTRU that uses its wide electric wave, AP 105 decision optimum transmit patterns are to transfer to this WTRU or to be received by this WTRU, and for instance, this AP 105 can use the angular surveying of arriving at that receives package, to determine a narrow electric wave emission mode.
Under preset state, the antenna of this AP 105 should be configured to a wide mode, and it contains the whole zone of service cell.Thus, Xian Zhi AP 105 can detect and receive the transmission from any WTRU that is positioned at its coverage area.
When this AP 105 has data will transfer to a WTRU and uses a narrow electric wave, this AP 105 utilizes the RTS/CTS handshake mechanism, this Initial R TS package system uses wide electric wave transmission, according to the CTS package that receives from this target WTRU, this AP 105 disposes its smart antennas and uses narrow electric wave to transmit this data packet.Please note that AP 105 can assess the optimization antenna parameter that transfers to this WTRU from the CTS package of this WTRU based on receiving.
Figure 4 shows that program 400 flow charts, it comprises the AP transmitting step that uses RTS/CTS mechanism according to the present invention in order to execution, the independent execution of bust this program system shown in the flow chart, and not in protection scope of the present invention.Typically, AP will attempt the transmission of this data packet again, and it is the same steps as of attempting according to for the first time, till the maximum of transmission attempt.
The RTS/CTS handshake mechanism causes the small data package to bear significantly.With regard to itself, the use that RTS/CTS and electric wave form can decide according to the data packet size, for example based on threshold value.Or rather, the small data package can use wide electric wave directly to transmit, otherwise big data packet can be according to the described program transmission of Fig. 4.
Please refer to the program 400 of Fig. 4, the invention solves above-mentioned hidden electric wave problem.In step 405, when an AP 105 desires send a package to the WTRU 110 that is positioned at a specific electric wave or 115, these AP 105 its antennas of configuration become a wide electric wave default value (step 410), and carry out 802.11MAC layer communications protocol and insert (step 415) for channel.This AP 105 uses a wide emission mode to transmit RTS control message and can both detect to guarantee each user in this cell to this WTRU (step 420).Each user in cell understands the duration of notified channel reservation, and it is by this RTS control message indication.This has been avoided WTRU 120 outside electric wave and the collision between the target WTRU 110 or 115 in electric wave.
Still please refer to Fig. 4, in step 425, this AP 105 waits for to receive the CTS control message from this at least one WTRU via this wide electric wave antenna, should control message by RTS mutually.If AP 105 does not receive the CTS message, then carry out bust this program (step 430).If receive the CTS message, then this AP 105 understands the optimization antenna settings (step 435) of decision and WTRU communication.This AP 105 then disposes this antenna becomes a narrow electric wave configuration (step 440), and transmits this data packet to this WTRU (step 445).In step 450, this AP 105 waits for to receive an ACK message, indicates this data packet successfully to be received by this WTRU.If AP 105 does not receive an ACK message, then carry out bust this program (step 430).If receive the ACK message, then this AP 105 returns this antenna configurations to wide electric wave configuration in the step 455.
If use the data packet fragment, this RTS/CTS control package only provides duration information in first fragment.The duration information of package of continuing lies among the MAC gauge outfit of preorder fragment and the ACK thereof and transmits.Along with the CTS message that receives from target WTRU, this AP 105 uses the electric wave of its smart antennas to form ability to transmit the remainder of this package, reduces the interference of neighbor cell and improves its transmission range.
Figure 5 shows that the flow chart of program 500, it comprises according to the present invention in order to carry out the AP transmitting step that uses RTS/CTS mechanism and fragment.Described as precedent, the RTS package is to use wide electric wave transmission, yet, when using fragment, this AP 105 uses this wide electric wave to transmit preorder, physical layer integration protocol (PLCP) gauge outfit and the MAC gauge outfit of a data packet (also being fragment), and the remainder of each fragment is still with narrow electric wave transmission.
In step 505, when AP 105 prepares to send package to the WTRU 110 that is positioned at a specific electric wave or 115, these AP 105 its antennas of configuration become a wide electric wave default value (step 510), and carry out 802.11MAC layer communications protocol and insert (step 515) for channel.This AP 105 uses a wide emission mode to transmit RTS control message to this WTRU (step 520), can detect to guarantee each user in this cell.In step 525, this AP 105 waits for to receive the CTS control message from this WTRU via this wide electric wave antenna configurations, should control message by RTS mutually.If do not receive the CTS message, then carry out bust this program (step 530).
If receive the CTS message, then this AP 105 can transmit preorder, physical layer integration protocol (PLCP) gauge outfit and the MAC gauge outfit (step 535) of a data packet (also being fragment) in a wide electric wave pattern.This AP 105 then determines the optimization antenna settings (step 540) with the WTRU communication.In step 545, these AP 105 these antennas of configuration become a narrow electric wave (also promptly concentrating) transmission, and follow in step 550 remainder of these AP 105 these fragments of transmission.In step 555, this AP 105 returns antenna configurations to default (wide electric wave) configuration.
In step 560, this AP 105 waits for to receive the CTS control message from least one WTRU via this wide electric wave antenna configurations, judges whether an ACK message is received by this WTRU.If do not receive an ACK message, then carry out bust this program (step 530).If receive the ACK message, whether then judge still has fragment need transmit (step 565), if there is at least one extra fragments etc. to be transmitted, then this program 500 is got back to step 535, and this AP 105 transmits preorder, physical layer integration protocol (PLCP) gauge outfit and the MAC gauge outfit of a data packet (also being fragment) under a wide electric wave pattern whereby.
One AP 105 also can use its adaptive antennas to receive the data packet from a WTRU.In this example, when receiving data packet, this AP 105 only need concentrate its antenna.This AP 105 uses wide electric wave to transmit this CTS package, and if necessary, transmits this ACK package.
Figure 6 shows that the flow chart of program 600, it comprises according to the present invention in order to carry out the AP receiving step of tool/do not have data packet fragment.As shown in Figure 1, if WTRU 110 has data will be sent to this AP105, then it sends the RTS message so that one period package transmission duration of channel reservation.Because WTRU 120 is outside WTRU 110 scopes (private communication channel), WTRU 120 can't detect the RTS message that is sent by WTRU 110.Yet, by the step of execution graph 6, the CTS package can use wide electric wave transmission, so AP 105 can guarantee that just WTRU 120 receives the CTS package, making WTRU 120 set its NAV is the transmission of data packets duration, and this channel is then just reserved so that transmit this data packet for WTRU 110.
Please still with reference to Fig. 6, an idle AP 105 receives a RTS or other message, the destination address (step 605) of indicating a data packet to wait to be sent to AP 105.In step 610, the optimization antenna settings of these AP 105 decisions and this WTRU communication.In step 615, judge whether the RTS message is received.Be received if judge the RTS frame in step 615, then this AP 105 uses a wide electric wave to transmit CTS control message (step 620), and then to dispose this antenna be that narrow electric wave (also promptly concentrating) is to receive data packet (step 625).If judge that in step 615 RTS is not received, if then package successfully receives, this AP 105 then uses a wide electric wave antenna configurations to send an ACK.
In step 630, judge whether package is successfully received by this AP 105.If package is not successfully received, these AP 105 these antennas of configuration become a wide electric wave (step 635), and carry out the program (step 640) that takes defeat.If package successfully is received, then these AP 105 these antennas of configuration become wide electric wave (step 645), and send an ACK message to this WTRU (step 650).In step 655, judge that whether fragment etc. is still arranged is to be transmitted, if there is at least one extra fragments etc. to be transmitted, just this program 600 is got back to step 625, this AP 105 can become a narrow electric wave (also promptly concentrating) to receive by these antennas of configuration whereby.
Although with specific the presenting and describe of preferred embodiment, person skilled in the art scholar should be understood that not breaking away under the protection range of the present invention, can do different variations in form and details in the present invention.
Claims (8)
1. wireless communication method that uses by access point with antenna, this method comprises:
This antenna configurations is become to contain the wide electric wave configuration in required service zone;
Via this wide electric wave antenna configurations, the transmission request sends the control message;
Wait is to receive clear to send control message via this wide electric wave antenna configurations;
This antenna configurations is become a narrow electric wave configuration;
Via this narrow electric wave antenna configurations, transmit at least one data packet;
Wait is with the confirmation of receipt message, and described affirmation message indicates this data packet successfully to be received; And
This antenna configurations is become this wide electric wave configuration, receive this with response and confirm message.
2. the method for claim 1 is characterized in that described method also comprises:
Before this request of transmission sends the control message, carry out medium access control layer protocol, insert in order to obtain channel.
3. wireless communication method that uses by access point with antenna, this method comprises:
This antenna configurations is become to contain the wide electric wave configuration in required service zone;
Via this wide electric wave antenna configurations, the transmission request sends the control message;
Wait is to receive clear to send control message via this wide electric wave antenna configurations;
Via this wide electric wave configuration, first part of transmission data packet fragment;
This antenna configurations is become narrow electric wave configuration; And
Via this narrow electric wave configuration, transmit second part of this data packet fragment.
4. method as claimed in claim 3 is characterized in that described method also comprises:
This access point is carried out medium access control layer protocol before this request of transmission sends the control message, in order to obtain channel access.
5. method as claimed in claim 3 is characterized in that described method also comprises:
After this second part of this data packet fragment of transmission, this antenna configurations is become wide electric wave configuration;
Wait is confirmed message to receive one, and described affirmation message indicates this data packet fragment successfully to be received.
6. method as claimed in claim 3 is characterized in that this first part of this data packet fragment comprises preorder, physical layer integration protocol gauge outfit and medium access control gauge outfit.
7. wireless communication method that uses by access point with antenna, this method comprises:
The request of reception sends the control message;
This antenna configurations is become wide electric wave antenna configurations;
Via this wide electric wave antenna configurations, transmission clear to send control message;
This antenna configurations is become narrow electric wave configuration;
Wait is to receive the data packet fragment via this narrow electric wave antenna configurations;
If successfully receive this data packet fragment, then this antenna configurations is become wide electric wave configuration; And
Message is confirmed in transmission one, and described affirmation message indication successfully receives this data packet fragment.
8. method as claimed in claim 7 is characterized in that described method also comprises:
If this data packet fragment is not successfully received, then this antenna configurations is become wide electric wave configuration.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57127704P | 2004-05-14 | 2004-05-14 | |
| US60/571,277 | 2004-05-14 | ||
| US10/875,122 | 2004-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910160524A Division CN101635931A (en) | 2004-05-14 | 2005-05-03 | Method of selectively adjusting the configuration of an access point antenna to enhance mobile station coverage |
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| CN101095315A CN101095315A (en) | 2007-12-26 |
| CN100512185C true CN100512185C (en) | 2009-07-08 |
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| CN200910160524A Pending CN101635931A (en) | 2004-05-14 | 2005-05-03 | Method of selectively adjusting the configuration of an access point antenna to enhance mobile station coverage |
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| CN102545978B (en) * | 2011-12-31 | 2014-10-29 | 福建星网锐捷网络有限公司 | Intelligent antenna configuration method, intelligent antenna system and wireless access equipment |
| CN102868431B (en) * | 2012-06-15 | 2015-06-17 | 福建星网锐捷网络有限公司 | Intelligent antenna control system and packet transmission method |
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- 2005-05-03 CN CN200910160524A patent/CN101635931A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 有效支持智能天线在移动Ad Hoc网络中应用的多址接入协议. 杨军，李建东，李维英.西安电子科技大学学报(自然科学版)，第30卷第3期. 2003 |
| 有效支持智能天线在移动Ad Hoc网络中应用的多址接入协议. 杨军，李建东，李维英.西安电子科技大学学报(自然科学版)，第30卷第3期. 2003 * |
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| CN101635931A (en) | 2010-01-27 |
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