CN101325779A - Method for adjusting subscriber station power during initiating ranging process of broadband wireless access system - Google Patents
Method for adjusting subscriber station power during initiating ranging process of broadband wireless access system Download PDFInfo
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- CN101325779A CN101325779A CNA2007101111660A CN200710111166A CN101325779A CN 101325779 A CN101325779 A CN 101325779A CN A2007101111660 A CNA2007101111660 A CN A2007101111660A CN 200710111166 A CN200710111166 A CN 200710111166A CN 101325779 A CN101325779 A CN 101325779A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000000977 initiatory effect Effects 0.000 title claims description 9
- 230000004044 response Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DXTBEGGSXUZVPZ-UHFFFAOYSA-N SS.SS Chemical compound SS.SS DXTBEGGSXUZVPZ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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Abstract
The invention discloses a method for controlling the distance-measuring tentative transmitting power, comprising: transmitting the request to the base station to process the distance-measuring message; trying to receive the response from the base station; and re-executing the transmitting request and the receiving response if the response from the base station is not received; to the i-th distance-measuring tentative, it the following powers: Pi=EIPxP IR, min+BS-EIRP-RSSi+ (G less than Rx-SS-G less than Tx-SS+(i-1)*(EIPxP IR, max- EIPxP IR, min/(N-1)) transmits the request to the base station; i is the from 1 to N, EIPxP IR.min represents the minimum equivalent and isogonic receiving power needed by the demodulating distance-measuring tentative transmitting power in the tentative process; N represents the tentative quantity of the maximum; RSSi represents the receiving signal intensity for the i-th distance-measuring tentative user measurement; the EIPxP IR, max is the maximum equivalent and isogonic receiving power; BS-EIRP is the equivalent and isogonic transmitting power; the G Rx-SS is the user station receiving antenna increase; the GTx-SS is the user station transmitting antenna increase.
Description
Technical field
The present invention relates to the method that subscriber station power in a kind of initiating ranging process of broadband wireless access system is adjusted, relate in particular to the method that subscriber station power is adjusted in a kind of initiating ranging process of broadband wireless access system of the IEEE of following 802.16 standards.
Background technology
Access Network is that subscriber equipment is connected to core net, makes subscriber equipment that the network of the miscellaneous service that provides by core net can be provided.Distinguish with access medium, comprise copper cash medium access technology, fiber medium access technology and wireless access technology.The irreplaceable advantages of wired access such as wireless access has degree of freedom height, open fast, geographical environment adaptability is strong, easy maintenance and maintenance cost are low.Wireless Personal Network (WPAN), wireless lan (wlan), wireless MAN (WMAN) and wireless wide area network (WWAN) have been formed the lattice chain framework of broadband wireless access jointly.Broadband wireless access is an a kind of quick deployment way of realizing that broadband network inserts.By it, operator can provide access service more flexibly for the user, satisfies the various bandwidth demand, and realizes the voice-and-data business integration.
IEEE 802.15 is the working groups that are responsible to define the Wireless Personal Network standard.IEEE 802.11 is the working groups that are responsible to define WLAN standard.IEEE 802.16 is the working groups that are responsible for working out wireless metropolitan area network standard.IEEE 802.20 is the working groups that are responsible for working out the wireless wide area network standard.The 2nd generation and the 3rd generation cell mobile communication systems be to use at present maximum wireless wide area networks.
Fixed broadband wireless is inserted air interface PHY (physics) layer to IEEE 802.16-2004 standard and MAC (medium access control) layer is stipulated, defined MAC layer and the corresponding a plurality of physical layer of supporting the fixed broadband wireless access system of multiple business type.This standard comprises three kinds of physical layer modes: single carrier, OFDM (OFDM) and OFDMA (OFDM).The single carrier mode is applicable to the system of 10～66GHz frequency range, and this frequency range available frequency resources is abundant, but propagation characteristic is relatively poor.The availability of frequency spectrum height of OFDM and OFDMA has remarkable advantages on the antagonism multipath effect, the 802.16-2004 system of 3.3GHz/3.5GHz frequency range mainly adopts OFDM and OFDMA physical layer mode.802.16-2004 the carrier bandwidths of standard can be selected between 1.25MHz～20MHz; The dual-mode of system can be FDD (Frequency Division Duplexing (FDD)), TDD (time division duplex), perhaps H-FDD (Half-Frequency Division Duplex).Standard definition BPSK, QPSK, 16QAM and 64QAM modulation system, adapt to the needs of different transmission ranges and bandwidth, support the autocoding modulation.The MAC layer is divided into three sublayers: Service Specific Convergence Sublayer, common part sublayer and Security Sublayer.A little arrive multiple spot (PMP) topological structure 802.16 network generally adopts, the MAC layer will solve problems such as the access of far-end multiple access, QoS (service quality), range finding and safety access.
802.16e standard is the expansion of 802.16-2004 standard, the 802.16e standard code can support system fixing and that mobile broadband wireless inserts simultaneously, be operated in less than 6GHz, be suitable for ambulant licensed band.802.16e that system can be used for is portable, low speed moves and complete mobile scene, supports the application of fixed scene simultaneously.802.16-2004 the OFDM physical layer adopts 256 subcarriers, the OFDMA physical layer adopts 2048 subcarriers, 802.16e the OFDMA physical layer is expanded, make its can support 128,512,1024 with 2048 totally 4 kinds of different sub-carrier numbers, with the variation of flexible adaptation channel width in mobile environment.Compare with the 802.16-2004 technology, the MAC layer of 802.16e technology has been introduced new function for supporting mobility and switching.
802.16 support two kinds of network topology structures, a kind of is two-way point-to-multipoint (PMP) structure, a kind of is netted (Mesh) structure.The PMP mode refers to a base station (BS) and serves a plurality of subscriber stations (SS) simultaneously, as shown in Figure 1.BS provides the general name of the cluster tool of connection, management and control SS.SS provides the general name of the cluster tool that subscriber equipment is connected with the base station.The link of the direction from the base station to the subscriber station is called down link, and the link of the direction from the subscriber station to the base station is called up link.
In the BWA, frame is the structured data sequence that is used for the fixedly duration of physical layer specification.One frame of IEEE 802.16 standards can comprise a uplink sub-frames and a downlink subframe.Physical slot by time (PS) is to depend on physical layer specification, is used to distribute the chronomere of bandwidth.In the single carrier physical layer, small-sized time slot (minislot) is the uplink bandwidth allocation unit that is equivalent to n physical slot by time, n=2m wherein, and m is from 0 to 7 integer range.The unidirectional mapping that is used to transmit the BS of service flow business purpose and the MAC opposite end between the SS is called connection.Connection is discerned by connection identifier (CID (CID).All business transmit on connecting.The structure of uplink sub-frames 10 as shown in Figure 2.Sub-frame of uplink 10 is by initial ranging competition slot 101, bandwidth request competition slot 102 and form from the up PHYPDU (physical layer protocol data unit) 103 of SS.
Fig. 3 is the initialized flow chart of subscriber station.Subscriber station initialization flow process comprises: scan down channel (step S1) and set up downlink synchronization (step S2), obtain uplink parameter (step S3), range finding and adjustment (step S4) automatically, negotiate for basic capability (step S5), subscriber station authentication and cipher key change (step S6) are to base station login (step S7), set up IP and connect (step S8), settling time (step S9), transmission operating parameter (step S10) is set up preparation and is connected (step S11).
Range finding (ranging) is to obtain the process that correct timing bias power is adjusted, and in the single carrier physical layer, makes the emission of SS snap to the symbol of sign minislot border starting point; In OFDM and OFDMA physical layer, make the emission of SS snap to the received frame of BS, and make signal in suitable threshold level, be received by the base station.In initial ranging, at first, SS carries out downlink synchronization, and by UCD MAC administrative messag, obtains the feature of up channel.UCD (upstream channel descriptor: uplink channel descriptor) be used to describe the physical layer attributes of up link.At this moment, SS scanning UL-MAP message is sought initial ranging at interval.UL-MAP (uplink map) message is the ensemble of communication that is used for the whole access of definition of scheduling interval.BS distributes the initial ranging interval of being made up of one or more transmission opportunity.For single carrier and OFDM physical layer, each transmission opportunity is specified by UCD TLV (type) distance measurement request chance size.
For single carrier and OFDM physical layer, SS sends RNG-REQ (distance measurement request: message ranging request) in an initial ranging interval.The CID territory is changed to no initializtion SS value (0).For the OFDMA physical layer, initiating ranging process is to begin from send the CDMA that is exclusively used in initial ranging (code division multiple access) sign indicating number that distributes in up link, replaces sending on competition slot RNG-REQ message.
Next interim when initial ranging opportunity, SS sends RNG-REQ message (being the CDMA sign indicating number in the OFDMA physical layer perhaps).
SS calculates the maximum emission intensity that is used for initial ranging, P
Tx_IR_MAX,
P
Tx_IR_MAX＝EIRxP
IR，max+BS_EIRP-RSS
Wherein, EIRxP
IR, maxObtain DCD (down channel descriptor: downlink channel descriptor) be the MAC message of describing the down channel physical layer characteristic from DCD with BS_EIRP.RSS (received signal intensity) is the RSSI (indication of received signal intensity) that SS measures.
Receive under the situation different with transmitting gain at the SS antenna, SS uses equation:
P
Tx_IR_MAX＝EIRxP
IR，max+BS_EIRP-RSS+(G
Rx_SS-G
Tx_SS)
Wherein, G
Rx_SSBe the SS receiving antenna gain, G
Tx_SSIt is the SS transmitter antenna gain (dBi).
Do not knowing EIRxP
IR, maxAnd/or under the situation of BS_EIRP, SS is from the minimum emissive power of BS definition.
EIRxP
IR, maxBeing orientation received powers such as maximum equivalent, is that the single antenna receiver is calculated RSS
IR, max-GANT_BS_Rx, wherein RSS
IR, maxBe that GANT_BS_Rx is a receiving antenna gain in the received signal intensity of antenna output.BS_EIRP is the orientation transmitting powers such as equivalence of BS, is to single-antenna transmission computer P
Tx+ GANT_BS_Tx, wherein P
TxBe transmitting power, GANT_BS_Tx is a transmitter antenna gain (dBi).
BS can use the different and BS of down link in the fdd mode and up link path loss the difference of the different antenna gains that transmits and receives antenna to consider at EIRxP
IR, maxIn.
For single carrier and OFDM physical layer, SS is to be lower than P at antenna connector
Tx_IR_MAXPower send RNG-REQ.If SS does not receive response, SS in next suitable initial ranging transmission opportunity with higher power emission.If SS receives response, and include the frame number that RNG-REQ sends in the response message, SS thinks that emission sounds out failure, suitable keep out of the way time delay after, according to the correction of RNG-RSP (ranging response) appointment, launch RNG-REQ message again.If SS receives the response of the MAC Address that includes it, SS thinks that RNG-RSP receives successfully.
Those of ordinary skills know, for the OFDMA physical layer, have similar processing procedure, are not described in detail.
There is higher, bigger to the interference of the system problem of emission power consumption in the SS of prior art in initiating ranging process.Therefore be necessary the transmitting power of SS initial ranging is optimized.
Summary of the invention
In order to optimize initial access process, the invention provides finds range in the control initiating ranging process in a kind of subscriber station sounds out the method for transmitting power, comprises step: send the message that request is found range to the base station; Attempt receiving response from the base station; If with the response that does not receive from the base station, then carry out described transmission request once more and receive the step that responds,
Wherein sound out, with following power for the i time range finding
P
i＝EIRxP
IR，min+BS_EIRP-RSS
i+(G
Rx_SS-G
Tx_SS)+(i-1)×(EIRxP
IR，max-EIRxP
IR，min)/(N-1)
To the base station described request, wherein i is 1 to N, EIRxP
IR, minBe illustrated in the process of initial ranging, required orientation received powers such as minimum equivalence are soundd out in the range finding of base station demodulating and decoding subscriber station emission, and N represents the maximum range finding exploration number of times that allows, RSS
iBe illustrated in the i time range finding of emission and sound out the received signal intensity that preceding subscriber station is measured, EIRxP
IR, maxBe orientation received powers such as maximum equivalent, BS_EIRP is the orientation transmitting powers such as equivalence of base station, G
Rx_SSBe the subscriber station receiving antenna gain, G
Tx_SSIt is the subscriber station transmitter antenna gain (dBi).
Description of drawings
Fig. 1 is 802.16 PMP topological structures.
Fig. 2 is an OFDM physical layer sub-frame of uplink structure.
Fig. 3 is a SS initialization flow process.
Fig. 4 is in initiating ranging process, the schematic diagram of SS emission range finding exploration sequence.
Embodiment
Be example with single carrier and OFDM physical layer below, embodiments of the present invention are described.Define two new parameters, EIRxP
IR, minAnd N.EIRxP
IR, minBe illustrated in the process of initial ranging, required orientation received powers such as minimum equivalence are soundd out in the range finding of BS demodulating and decoding SS emission.N represents the maximum range finding exploration number of times that allows.As shown in Figure 4, sound out for range finding for the first time, SS is with power
P
1＝EIRxP
IR，min+BS_EIRP-RSS
1+(G
Rx_SS-G
Tx_SS)
The emission range finding is soundd out.RSS in the formula
1Be the received signal intensity that SS measures before the 1st range finding of emission soundd out.
Sound out for range finding for the second time, SS is with power
P
2＝EIRxP
IR，min+BS_EIRP-RSS
2+(G
Rx_SS-G
Tx_SS)+(EIRxP
IR，max-EIRxP
IR，min)/(N-1)
The emission range finding is soundd out.RSS in the formula
2Be the received signal intensity that SS measures before the 2nd range finding of emission soundd out.
Sound out for the i time range finding, SS is with power
P
i＝EIRxP
IR，min+BS_EIRP-RSS
i+(G
Rx_SS-G
Tx_SS)+(i-1)×(EIRxP
IR，max-EIRxP
IR，min)/(N-1)
The emission range finding is soundd out.RSS in the formula
iBe the received signal intensity that SS measures before the i time range finding of emission soundd out.
Sound out for the N time range finding, SS is with power
P
N＝EIRxP
IR，max+BS_EIRP-RSS
N+(G
Rx_SS-G
Tx_SS)
The emission range finding is soundd out.RSS in the formula
NBe the received signal intensity that SS measures before the N time range finding of emission soundd out.
In addition, sound out for the i time range finding, if comprise the frame number of request message in the response that receives, then through suitable keep out of the way time delay after, according to the correction of response appointment, start above-mentioned range finding once more and sound out process.In addition, if respond packet contains the MAC Address of described subscriber station, then showing finds range sounds out successfully.
Claims (4)
- In the subscriber station in the control initiating ranging process range finding sound out the method for transmitting power, comprise step:Send the message that request is found range to the base station;Attempt receiving response from the base station; WithIf do not receive response from the base station, then carry out described transmission request once more and receive the step that responds,Wherein sound out, with following power for the i time range findingP i＝EIRxP IR，min+BS_EIRP-RSS i+(G Rx_SS-G Tx_SS)+(i-1)×(EIRxP IR，max-EIRxP IR，min)/(N-1)To the base station described request, wherein i is 1 to N, EIRxP IR, minBe illustrated in the process of initial ranging, required orientation received powers such as minimum equivalence are soundd out in the range finding of base station demodulating and decoding subscriber station emission, and N represents the maximum range finding exploration number of times that allows, RSS iBe illustrated in the i time range finding of emission and sound out the received signal intensity that preceding subscriber station is measured, EIRxP IR, maxBe orientation received powers such as maximum equivalent, BS_EIRP is the orientation transmitting powers such as equivalence of base station, G Rx_SSBe the subscriber station receiving antenna gain, G Tx_SSIt is the subscriber station transmitter antenna gain (dBi).
- According to the process of claim 1 wherein described transmission based on physical layer be one of single carrier physical layer, OFDM physical layer and OFDMA physical layer.
- 3. according to the method for claim 1, also comprise step:If include in the described response that receives this response at the frame number of request message, then through suitable keep out of the way time delay after, according to the correction of described response appointment, start described range finding once more and sound out process.
- 4. according to the method for claim 1, also comprise step:If the described respond packet that receives contains the MAC Address of described subscriber station, then stop described range finding and sound out process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110366743A (en) * | 2017-08-24 | 2019-10-22 | 深圳市大疆创新科技有限公司 | Remote Slave Set, remote controler and remote control system |
-
2007
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110366743A (en) * | 2017-08-24 | 2019-10-22 | 深圳市大疆创新科技有限公司 | Remote Slave Set, remote controler and remote control system |
| CN110366743B (en) * | 2017-08-24 | 2021-09-21 | 深圳市大疆创新科技有限公司 | Remote control assistance device, remote controller, and remote control system |
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Open date: 20081217 |